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TRAC
MOBILE FM TWO-WAY RADIO
4 25-54 MC BOW, 50 W & 100 W RF POW ER
AEPD-6386-A (MC6759)
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MOTOROLA INC.
Engineering Publications 4501 W. Augusta Blvd.
Copyright 1962 by Motorola, Inc.
Printed in U.S.A.
11/13/62-UM
MOTOROLA
MOTRAC
MOBILE FM TWO-WAY RADIO
25-54 MC
COMMUNICATIONS DIVISION
Chicago 51, Illinois
68P81014A05
Issue - O
ii
SPECIFICATIONS
GENERAL
MODELS U41HHT Series (30 watts) U51HHT Series (50 watts) U71HHT Series (100 watts)
STANDBY 6.6 v d-c 13.8 v d-c 6.6 v d-c 13.8 v d-c 13.8 v d-c
(xmtr filaments off) 2.1 amps 0.35 amp 2.1 amps 0.35 amp 0.35 amp
*MAXIMUM
heey RECEIVE 6.6 v d-c 13.8 v d-c 6.6 v d-c 13.8 v d-c 13.8 v d-c
DRAIN (xmtr filaments on) 6.1 amps 2.2 amps 6.1 amps 2.2 amps 2.8 amps
eS ST
6.4 v d-c 13.6 v d-c 6.4 v d-c 13.6 v d-c 13.4 vd-c
TRANSMIT 35.5 amps 14.3 amps 24.5 amps
26 amps 12 amps
*add average drain per crystal oven at 25°C: 0.18 amp on 12 v d-c operation; 0.55 amp on 6 v d-c operation
FREQUENCY 25-50 mc ("'Extender" and dual squelch models); 25-54 mc (carrier squelch models)
METERING
DIMENSIONS
A single scale, 0-50 microampere meter or Motorola portable test set can be used to
measure all circuits essential to tuning and checking.
Dash mount: 4" high x 13-3/8'' wide x 18-3/4" long overall (30 & 50 w);
19-1/2" long overall (100 w)
Trunk mount: 3-1/4" high x 13-3/8"' wide x 17-1/2" long overall (30 & 50 w);
18-1/4"' long overall (100 w)
WEIGHT approximately 30 lbs (shipping weight including accessories: approximately 50 lbs)
"H'" TRANSMITTER
CHASSIS TTB1000 & TTB1060 Series
RF POWER OUTPUT 30, 50 or 100 watts, depending upon radio set model.
OUTPUT IMPEDANCE 50 ohms
SPURIOUS & F : F
HARMONIC EMISSIONS spurious and harmonics more than 85 db below carrier.
oven type crystal unit maintains carrier within +.0005% of assigned center frequency from
-30°C to +60°C ambient (+25°C reference
)
MODULATION 20F3: +5 kc for 100% at 1000 cps or 40F3: +15 kc for 100% at 1000 cps
AUDIO SENSITIVITY .165 volt +3 db for 2/3 maximum deviation at 1000 cps
FM NOISE -50 db below +3.3 kc deviation at 1000 cps
-56 db below +10 kc deviation at 1000 cps
AUDIO RESPONSE
(carrier squelch)
AUDIO DISTORTION less than 10% at 1000 cps; +3.3 kc deviation
"H'" RECEIVER
TRBIIZ0BB, BD, BE, BH
TRB1130BB, BD, BF, BH
Cateeete TRB1140BB, BD, BF, BH
TRB1150BB, BD, BF, BH
SELECTIVITY -100 db at 15 ke -100 db at +32 kc
SENSITIVITY less than 0.40 microvolt for 20 db quieting; 50 ohms r-f input impedance
oven type crystal maintains oscillator frequency within +.0005% of reference frequency
from -30°C to +60°C ambient (+25°C reference)
FREQUENCY STABILITY
+1, -6 db of 6 db/octave pre-emphasis
characteristic from 300 to 3000 cps
(dual squelch)
+1, -3 db of 6 db/octave pre-emphasis
characteristic from 300 to 3000 cps
TRB1120BA, BC
TRB1130BA, BC
FREQUENCY STABILITY
SPURIOUS &
IMAGE REJECTION
SQUELCH
more than 100 db
Carrier Squelch; noise compensated type, adjustable sensitivity, threshold sensitivity of
0.15 microvolt (Patent No. 2343115, other patents pending). Dual squelch; also includes
a tone-operated squelch circuit with a fixed sensitivity of 0.15 microvolt (Patent No.
2688059)
AUDIO OUTPUT 5 watts to a 3 ohm load measured at the receiver output at less than 10% distortion
AUDIO RESPONSE +1, -8 db of 6 db/octave de-emphasis characteristic from 300 to 3000 cps
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
FCC LICENSE DESIGNATION: ©CC1027 for 30 watts output
CC1028 for 50 watts output
CC1033 for 100 watts output
68P81009A98-A
FOREWORD
SCOPE OF INSTRUCTION MANUAL
This manual offers descriptive and service
information for the ''Motrac'' RadioSets described
init. A SERVICE DIAGRAMS booklet is also
included with the radio set which includes the
schematic, parts lists, and printed circuit board
details.
NOMENCLATURE
Motorola ''Motrac'! radio equipment is pack-
aged as a radio set plus accessories. The radio
set is specifically identified by the model number
on the nameplate.
NOTE
Be sure'to use the entire model number
when making inquiries about your equip-
ment.
The accessories are identified by an acces-
sory group number which includes the other
items essential to completing the radio instal-
lation such as; antenna, cables, etc. Use this
number when referring to a specific group of
accessories.
Identifiers have been assigned to chassis and
kits. Use these identifiers when requesting
information or ordering replacements.
Radio set and accessory group charts are
located in the front of this manual.
PRODUCTION CHANGES
When production and engineering changes
are incorporated into the equipment, a revision
numeralis assignedtothe chassis or kit affected.
Typical Example:
A Model TTD1251AA Transmitter becomes
TTD1251AA-1 with the first revision.
This chassis number complete with revision
numeral if any, is stamped on the chassis at the
time of production. The revisionnumeral becomes
an integral part of the chassis identifier.
A schematic diagram number complete with its
issue letteris alsostampedoneach chassis. This
establishes direct correlation between the chassis
and its schematic. The schematic issue is
advancedeachtime a change occurs inthe chassis.
INSTRUCTION MANUAL REVISIONS
Changes which occur after an instruction
manualis printedare described in the Instruction
ManualRevisions. These bulletins give the reader
complete information on the change including
pertinent parts listing data.
NATIONAL SERVICE ORGANIZATION
Motorola provides a nation-wide service
organization. Through its maintenance and
installation program Motorola makes available
the finest service to those
desiring reliable continuous
communications on a con-
tract basis.
MOTOROLA
RADIO COMMUNICATIONS
The largest service
organization specializing in
mobile communications is
Motorola's National Service Organization. Over
800 strategically located, adequately staffed and
trained, independently owned and operated
stations, manned with several thousand FCC
licensed personnel constitute the sub-contracting
£orce,
The administrative forces ofarea and district
service managers and district service represent-
atives are in the direct employ of Motorola.
For your contract service requirements,
please contact your local Motorola representative
or write to:
National Service Manager
Motorola Communications Division
4501 W. Augusta Blvd., Chicago 51, Illinois
REPLACEMENT PARTS ORDERING
Motorola maintains parts and service depots
and authorized service stations strategically lo-
cated throughout the country. These facilities
are fully equipped to give the finest service.
When ordering replacement parts, the com-
plete number identification of the item must be
used whether it be a component, kit or complete
chassis. This will fix proper identification and
insure receipt of the desired item. Complete
number identification should also be used when
requesting equipment information.
iil
Orders for ''Vibrasender"' and ''Vibrasponder"
resonant reeds should specify the type number and
frequency and should identify the owner and operator
of the communications system in which these items
Crystal orders should specify crystal type
number, crystal frequency, carrier frequency
andthe chassis modelnumber in which the crystal
is to be used.
are to be used.
CAREFUL USE OF THE INSTRUCTION MANUAL AND THE MANY SUGGESTIONS
CONTAINED IN IT WILL FURTHER INSURE PROPERLY INSTALLED AND MAIN-
TAINED RADIO EQUIPMENT.
THE EQUIPMENT DESCRIBED IN THIS MANUAL IS MANUFACTURED UNDER
iv
ONE OR MORE OF THE FOLLOWING MOTOROLA U.S. PATENTS:
RE-24, 110 2, 602, 842 2, 738, 466 2, 809, 236 2,918, 571
RE-24, 815 2, 608, 648 2, 740, 891 2, 810, 068 2,924, 705
2, 404, 359 2, 608, 649 2, 743, 144 2,830, 200 . 2,925, 562
2,439, 408 2, 626, 384 2, 743, 361 Z, 833,994 2,938, 082
2,439,412 2, 637, 782 2, 750, 451 2, 834, 879 2,963,577
2,472, 021 2, 650, 333 2, 759, 052 2,835, 794 2,966, 585
2,524, 300 2, 662,942 2, 759, 103 2,852, 730 2, 968, 739
2,524, 534 2, 688, 059 2,770, 721 2, 860, 239 2,974, 221
2,547, 023 2,691, 094 Z, 417,950 2, 883, 521 2, 984, 740
2,547, 025 2,691,560 2, 784, 263 2, 888, 652 2,994, 844
2,547, 027 2,699, 425 2,799,001 2,899, 547 3,009,115
z, 566, 759 2, 705, 281 2,799,010 2,901,601 3,014, 127
2,583, 032 2,731,555 2,808, 507 6,912,573
Other U.S, Patents Pending
CONTENTS
SECTION
Guaranteed pertormance Specifications . 0, 2 « « % «8 « «© “« © «© ~« «©
RAGIO DOLE MOGG mcilaLlcu © umiCiMRtG) We oe fies) ea es ee fs oy) 6 oy sk se oe! 8 ld
Pe COSe OR VEC ROU ella tT Cie weet s (Ash 6,9 Gye) is ow a ie et, eS ey, et we ee
DESCRIPTION
PAGO WCT | acme mene (se is) fete vel 6 46. .% oie oes se 8 ee
Pave Ove Ts. (Mens iemne! ich) fs Nis ie te fa ef ow ee) lw es
ABSCRRSHAATRU OTE a 6 dg OS GG) Ge oe 6 a lau eo a to. SG Re Bae
Re Ce 1G 1 sm ein. tase EE MER Mile Moe dhe! 6 hs “s | '9 5. 8s ears: 0), veo * 6 e,le yee
POW 2 OE LLG S meee euMe mvs? ist) es fen es /celye 0 fe
at Comumegave Le OOLUI © Mic mi tei sll let ls asap op Je on. cs 8 le oy ule sey * 6 ‘0: «he
Patio miNeruris TOWItCH mre aun is, Wer fe) 6 Wi wwe Wath er Me She ee ele eh ce: ae Ne
PEWS, Ap eS ERS eR ee iar eee ee ee ey
eee eT TOU S er eae care ests ast 6 6 6 lo Spas RL eu) Sg (8 lee 6 ped pay bs
Smo A eC COS SOLIS, mum ie wis lok. «Lot logue sii sy ce Geko 6.) aw. leh ss ty Sainte
RECOMMENDED TEST EQUIPMENT . . . 2. «© «© «© 2 © © © © © © «© © © »
INSTALLATION AND OPERATION
Poor itGetnosR OC OnoCtiM NoMErGME iol sos Ge. iis | ste Se. wr) ek 6. 6) #6 6 ee
Operating Instructions . . ° = hnh sig! « iiss hess oldies stallion oder = tons
Low Current Drain Modification, for iZ ‘Volt Spsters Pf! 2 eel aie os a mee rie Ba
THEORY OF OPERATION
Rim OEM UMCELOI a tO) DEP ALION wiped ane i) os?) sols pesuneeeten cs ceo ties oe eo Bs
OVC AY OltamunctionalOpe ration -, utes ste kets 1 ee) ete ow wl
RC CCLVGT .a gis meen nl <2) ) (sae Cee hems
Transmitter .
PIOMe OU Dp tC oa amie wee alin eme MME MERE Seth wars ol etet cela ou Mie
SERVICE AIDS
Receiver. . CM TR wei ekih ily whic! Cue ten. “ou me
Transmitter (30- 50 Watts) . 5 With itp Aa ICR RSE, eee anor ae
Transmitter (100 Watts).
Tone Oscillator Disassembly . ona .
Dual moduelche er imMivaltenaane eWieaintenanC@cy <4 .61) se) e Mse + » 1s. 8 os! bs. | «
PReECOSSOtyWOnVer sl 1On—sils ETUC IONS Wc is Men) sue) Wis. Goes ele ss © vale Te | es 6
PPEXtende ra oer Vic dig ete TOCCOULEEra |p) We Mice ath ye xe + res iso) fe Pte ten
+12 V ‘‘MOTRAC”’ MISCELLANEOUS PARTS LOCATION DETAIL . ... ... «@
+6/12 V ‘‘MOTRAC”’ MISCELLANEOUS PARTS LOCATION DETAIL .
HEAT SINK AND HOUSING DETAIL. . ........ .
TRANSMITTER ALIGNMENT PROCEDURE. . . . . . .© © © «© © «© © «@ «
‘IDC’ ADJUSTMENT PROCEDURE . . ....... .
RECEIVER ALIGNMENT PROCEDURE
RECEIVER ALIGNMENT PROCEDURE FOR ‘‘EXTENDER’’ MODELS
IMPORTANT
Service diagrams for these radio sets are in an additional
booklet supplied with this instruction manual. Be sure to
refer to the applicable Service Diagram Booklet listing on
the next page.
PAGE
ii
vii
viii
Oo) Gor Go) Con IN IN) Rete it
aN
a)
oOo ®O CO A)
20
21
23
25
Zt
29
31
33
35
She
39
40
41
43
SERVICE DIAGRAM BOOKLETS
30-50 W +12 V Carrier Squelch Models
30-50 W +12 V Carrier Squelch Models With ''Extender'' Operation
30-50 W +12 V Dual Squelch Models
30-50 W +12 V Dual Squelch Models With ''Extender'' Operation
100 W +12 V Carrier Squelch Models
100 W +12 V Carrier Squelch Models With "Extender" Operation
100 W +12 V Dual Squelch Models
100 W +12 V Dual Squelch Models With ''Extender'' Operation
30-50 W +6/12 V Carrier Squelch Models
30-50 W +6/12 V Carrier Squelch Models With 'Extender'' Operation
30-50 W +6/12 V Dual Squelch Models
30-50 W +6/12 V Dual Squelch Models With ''Extender"' Operation
vi
68P81014A40
68P81014A10
68P81014A50
68P81014A20
68P81014A45
68P81014A15
68P81014A55
68P81014A25
68P81014A60
68P81014A15
68P81014A65
68P81014A35
‘MICROPHONE
| INCLUDED
[a ES
| 7 SLES
Pee rere!
ney noe
ioe SET
[Set ES ee
2 NO ee |
rose 1S
Oa
Sey ES Sea
Ce ee)
Ne ee
Beate 2 ares
Fo NOS S|
on SES
3b na]
CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ,, DASH-MOUNT
ONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ, , DASH-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ., TRUNK-MOUNT
ONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ,,. TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ,, TRUNK-MOUNT
ONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ,, TRUNK-MOUNT
ONTROL HEAD I MIC, CONNECTOR, 1-FREQ,, DASH-MOUNT
AF CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., DASH-MOUNT
& ONTROL HEAD, W 4 ONN OR R DASH -M N
AL CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., DASH-MOUN
26AG CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., TRUNK-MOUNT
026AH CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
0025AG CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., DASH-MOUNT
{6025AH CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ,, DASH-MOUNT
.N6026AE CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ,, TRUNK -MOUNT
SN6026AF CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
.CN6025AE CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ., DASH-MOUNT
ICN6025AF CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., DASH-MOUNT
TCN6030A ONTR HEA I NN I REO PR -MOUN
TCN6030AH CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., TRUNK-MOUNT
i
Ea F
, RADIO SETS 2 af at
aI ra Fal bt
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fe) |e] i
n
[aa]
a
P
, H
PLIED 5 aS ae
z 2 OO DFS|D/2) 212
fo) Q ojolo|S}S
sUPPLIED DEPENDING UPON a alaia gig
*REQUENCY. 4 Ps ee ly
a =) PP]|P]| nln
H 4 paler |e | <<) <i
a a HIRI} AIA
4 > Sed be baad Fee
3 SINISE
4
= =| 15] |
s 1S) OlO} O} O} OF
wi LO} | LO] LO] woe
=) 19) WNfrO] 0] «yo io
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Q Qjo}yo}a}a
DESCRIPTION S aaa
ROL HEAD, Wilh Mic. CONNECTOR, 1-FREQ., TRUNK-MOUNT gl Bea
{TROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT ia Bee
NTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., DASH-MOUNT BEA
SNTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., DASH-MOUNT Sea
,ONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., TRUNK-MOUNT Bao
@
Bi
(e)
(ea
i)
=
ie
(a
ES
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(ea
2)
sy
xy
(cal
:
<
| CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT _|
| TCN6030AE |
| TCN6027AE | | G
_| Q
| &
| im
CABLE KIT, 1-FREQ. : > 0 a
a 6
| TKN6096A _| ai | ig
| | a
| go gl
GRE RE BASEs Sees Bee
LKR IIE LX TX Dx IKI XXX XX
TIX IX XXX TX IX DAXIX XT IDX TX XTX!
| TMN6000A _| EME <Ee EEE eee
BEAZ44 08887 242284 42488
| TU304H_ ._| E444 8888. 4008422248
o VV
| / |
| TLN6238A__| | x!
| TLN6252A _| |_| x
MAT Ss Rela Heaps ee ee Sora | |
Pea Sr a aa ee a ee (i ||
(SE iE eee ce rs iy
Seed GES ot Ieee Se eee ke
ES Ee eas ee EE fy
ES ESS rs io Ss Rl BB
CSS Es ae a eS
ee | LED ee ee de ee a TEES ey
Cee a ae ee ee ee ee ee Beet
[2p Sd EE SE ee [yi
LSE DE SS See Ee Se ee ee ee ee
SERVICE DIAGRAM BOOKLETS
30-50 W +12 V Carrier Squelch Models
30-50 W +12 V Carrier Squelch Models With "Extender'' Operation
30-50 W +12 V Dual Squelch Models
30-50 W +12 V Dual Squelch Models With ''Extender'' Operation
100 W +12 V Carrier Squelch Models
100 W +12 V Carrier Squelch Models With ''Extender'' Operation
100 W +12 V Dual Squelch Models
100 W +12 V Dual Squelch Models With ''Extender'"' Operation
30-50 W +6/12 V Carrier Squelch Models
30-50 W +6/12 V Carrier Squelch Models With ''Extender" Operation
30-50 W +6/12 V Dual Squelch Models
30-50 W +6/12 V Dual Squelch Models With ''Extender'' Operation
vi
68P81014A40
68P81014A10
68P81014A50
68P81014A20
68P81014A45
68P81014A15
68P81014A55
68P81014A25
68P81014A60
68P81014A15
68P81014A65
68P81014A35
MOTOROLA
MODEL CHART
- LINE"
00 SER
FOR
GROUPS
1000 OR 1100 SERIES)
1100 SERIES)
1100 SERIES
>
fe
fe)
dp)
WwW
al
O
O
a
25-54 MC
a
=
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a
n
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Fe
Q
A
"MOTRAC"
DC OR DD (3000 OR 3100 SERIES)
DC OR DD (3000 OR 3100 SERIES
DC OR DD (1000 OR 1100 SERIES)
DC OR DD (1000 OR 1100 SERIES)
DC OR DD (1000 OR 1100 SERIES)
DC OR DD (
DC OR DD (1000 OR 1100 SERINS)
DC OR DD (3000 OR 3100 SERIES
DC OR DD (1000 OR 1100 SERIES
DC OR DD (1000 OR 1100 SERIES
DC OR DD (3100 SERIES)
DC OR DD (3100 SERIES)
DC OR DD (1100 SERIES)
DC OR DD (1100 SERIES)
DC OR DD (1100 SERIES)
DC OR DD (1100 SERIES)
a
A
6G
fa]
n
°
ro)
Qa
A
fag
oO
10)
(a)
DC OR DD (3100 SERIES
DD OR DE (1100 SERIES)
DC OR DD (3100 SERIES)
DD OR DE (3100 SERIES)
DC OR DD (1100 SERIES
DC OR DD
DC OR DD (
Do_OR DD (1100 SERIES)
FM TWO-WAY MOBILE RADIO SETS
- 12 V - CARRIER SQUELCH
40 KC
U51HHT-1030D§ 2 fF 2 50 WO 40 KC
20 KG
20 KC
U41HHT-1101IC M1 ~=—Oo 530 WOE 20 KC |
2
2
ae
| SSD Oe |
Pa
1
pam
40 KC
| 20 KC |
| P2OKKGI
| 50 Wf 20 KC]
20 KC
20 KC
| 20 KC |
| 20 KC |
eon |
| 20 KC |
| 20 KC |
CHAN.
SPAC
20 KC
[= 20eRG | | DC OR DD |
20 KC l
20 KC
100 W 20 KC
40 KC
40 K
| 20 KC |
"EXTENDER" MODELS
ONE ITEM SUPPLIED.
- 12 VOLT - DUAL SQUELCH "PRIVATE
1-0 w y coKc
eeaens|
100 W
30 W
30 W
100 W
100 W
50 W
100 W
100 W
100 W
[30 Wf 20 KC]
30 W
80 We
| 50 Ws |
50 W
30 W
50 W
N &
ONE ITEM SUPPLIED PER FIVE (OR LESS) RADIO SETS.
SOR Wane W [P2origy
| 30 W_ i 20 KC |
Bae) Ea
| 2) 30 w_ O20 Kc |
ny se |
Reies Eaaa
Geis Ses
Loo WO 20 KC |
XMTR
POWER
U41HHT-1000D 1 O30 WO 40 KC
| fu4inntT-31000 9 1 CO 0 wT
ONE ITEM SUPPLIED DEPENDING UPON CARRIER
FREQUENCY.
(a
| fusinnT-31300 2) 230 wt 20 Kc |
2
1
2
2
XMTR
FREQ'S
| 2 Ot 30 w_ OT 40 Kc
U41HHT-1100D Ft 350 We 20 Ke
WhasweaLno Lol | LAT
| 2S 100 Ww 40 KC
[2 100 w_§) 20Kc]
[2 2 100 wf 20 Kc |
U41HHT-3101CM 1 O80 W200 KC |
a
es ER Kal
[230 W_ 20 KC]
|
eee
|
*REPRESENTS A SERIES OF MODELS AND NOT A SPECIFIC MODEL. THE
SPECIFIC MODEL, AS STAMPED ON THE CHASSIS, IS DETERMINED BY
ITS APPLICATION.
l
1
U71HHT-1030CH 2 #§@ 2 #4 100w 40 KC
U71HHT-1100CH 1 COU SSC 00 W 20 KC
"EXTENDER" MODELS
U41HHT-3400By 1
U4IHHT-3410B 1.
RCVR
FREQ'S
ee eee EC Bo
Reon
Be Bee Bes Peed
Sel se |
ae ee |
el pee |
USIHHT-1100D. 1. =| 1 — 50 Ww — 20 KCB DC OR DD (1100 Seni=
SIHHT-1131C9. 2 7 feo 2. ||
USIHHT-31100 PO 250 ws 20 KC |
Bees
Seine
Laas 2s
Loa)
USIHHT-1110DH 1 = 2 so w_ O20 Kc |
U41HHT-1130D | 2) 2
Tee a i
1
U4IHHT-3131CN 2 |
USIHHT-3101CN 1 |
U41HHT-3430B— 2 |
ole |
kl ae |
| SaeaA t
4 EES]
|
re |
AO] YO qQja OO OO} oO OLOJO oO OO isa joa} [ea oa} [ea [aa OQ a] fsa} fs)
lo) fo) Ko) fo} i>} Ko) oO} CO} © lo} ko) coal 4 ed fore! foe! = roel eel oO lo} fo) lo) fo) So i ea ai
YO} Ao Coal Moe) oOl|— tl oe) a oO (o>) fen! koa) tn! isa) k=) lo) aes oj isa) iS + Coed ae)
ao) fo} Ko} fo) Ko) al Ly eal fe) Ko) fo) 4 fe) Cal vt tis a bo vv st + el Pow
Oy CO] COP OD a4 alo Coal ama! isa) ~m aad nl alo (s9) eyed a4 co oy — a4
- OC! ane rs a oa 1 1 Vy eit ! nae 1 tpt yt ' i t 2
AYR] He A] Ey} Ay H Sal sa! fs! st A AH A Aye is is = a = Ey
fon Fan] aw en ee ee ma a ony pan q eo) poy Hy ma a fen) fan jee fa ae Ae Gy ee
eR) ees 2 ee SRE eh | Es 2 a) eared Ee Sey os sl ee fs z ie hae ee
ITEM DESCRIPTION eye st] SH SiS Sis H 173) Mi cal ce ced ce pac to] in rT) Te by rT) ~H ~ La} a)
PLP} 0) PLP =) i=) =) i=) 2) =) =) =) 2) =) =) =) =) =) =) i=) =) t=) =] i= i= =) =) 2) =)
X
*TRB1120BF RECEIVER 12 V, DUAL SQUELCH, 1-FREQ.
*TRB1120BH RECEIVER 12 V, DUAL SQUELCH, 2-FREQ.
*TRB1120BB RECEIVER 12 V, CARRIER SQUELCH, 1-FREQ., 20 K
*TRB1120BD REG ER 12 V, CARRIER SQUELCH, 2-FREQ., 20K
*TRB11I2Z0BA RECEIVER 12 V, CARRIER SQUELCH, 1-FREQ., 40 KC
*TRB1120BC RECEIVER 12 V, CARRIER SQUELCH , 2-FREQ 40 K
*TRBII30BF RECEIVER 6/12 V, DUAL SQUELCH, 1-FREQ
*TRB1130BH RECEIVER 6/12 V, DUAL SQUELCH, 2-FREQ.
*TRB1130BB RECEIVER 6/12 V, CARRIER SQUELCH, 1-FREQ., 20 KC
*TRB1130BD RECEIVER 6/12 V, CARRIER SQUELCH, 2-FREQ., 20 KC
*TRB1130BA RECEIVER 6/12 V, CARRIER SQUELCH, 1-FREQ., 40 KC
*TRB1130BC RECEIVER 6/12 V, CARRIER SQUELCH, 2-FREQ., 40 KC
*TRB1140BF RECEIVER ("EXTENDER") 12 V, DUAL SQUELCH, 1-FREQ
*TRB1140BH RECEIVER ("EXTENDER") 12 V, DUAL SQUELCH, 2-FREQ.
*TRB1140BB RECEIVER ("EXTENDER") 12 V, CARRIER SQUELCH, 1-FREQ.
bi
USIHHT-3100D Fn sow 20 KC |
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RECEIVER ("EXTENDER") 6/12 V, CARRIER SQUELCH, 1-FREQ.
RECEIVER ("EXTENDER") 6/12 V, CARRIER SQUELCH, 2-FREQ.
TRANSMITTER, 30-50 W, 1-FREQ.
TRANSMITTER, 30-50 W, 2-FREQ.
TRANSMITTER, 100 W, 1-FREQ.
TRANSMITTER, 100 W, 2-FREQ.
POWER SUPPLY, 12 V, DUAL SQUELCH, 30 WATT
POWER SUPPLY, 12 V, DUAL SQUELCH, 50 WATT
POWER SUPPLY, 12 V, DUAL SQUELCH, 100 WA
POWER SUPPLY, 12 V, CARRIER SQUELCH, 30 WATT
TPN1008AA POWER SUPPLY, 12 V, CARRIER SQUELCH, 50 WA
PNIO09AA POWER SUPPLY, 12 V, CARRIER SQUELCH, 100 WATT
TPN1014AC POWER SUPPLY, 6/12 V, DUAL SQUELCH, 30 WATT
POWER SUPPLY, 6/12 V, DUAL SQUELCH, 50 WATT
POWER SUPPLY, 6/12 V, CARRIER SQUELCH, 30 WATT
POWER SUPPLY, 6/12 V, CARRIER SQUELCH, 50 WATT
FUSE KIT (100 WATT MODELS ONLY)
TGN6002A FRONT PANEL (ALL RADIO SE 5
*TRB1150BB
*TRB1150BD
*TTBIO00BA
*TTB1O00BB
*TTBIO60AA
*TTB1060AB
TPN1007AC
TPN1008AC
PN1009AC
TPN1007AA
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DESCRIPTION
1. INTRODUCTION
The Motorola ''Motrac"' radio is a mobile
FM two-way radio with a fully transistorized re-
ceiver and power supply. The advantages of the
transistor -- reliability, lightweight, compact
size, reduced maintenance and operating costs
_-- are fully utilized. A wide variety of models
are available with 30, 50 or 100 watt transmitter
r-f power output, ''Extender'' operation, carrier
or dual squelch ''Private-Line'' operation and+12
volt or 6/12 volt primary inputs. Refer to the
model chart at the front of this manual for a
listing of the various models available in the
25-54 mc frequency range.
2. PRIMARY POWER
a. +12 VDC Models
The power supplies used in +12 v d-c models
are equipped with a polarity reversing plug and
receptacle. Positive (+) ground operation is ac-
complished by inserting the plug in the recepta-
cle so that the red area of the receptacle is visi-
ble. Negative (-) ground operation is accom-
plished by inserting the plug so that the white
area of the receptacle is visible.
b. +£6/12 VDC Models
The power supplies used in +6/12 v d-c
models are equipped with a voltage plug and re-
ceptacle in addition to the polarity plug and re-
ceptacle previously described for +12 v d-c
models. When the voltage plug is inserted in the
receptacle so that the yellow portion of the re-
ceptacle is visible, the radio set will operate
from a 6 v d-c source. When the plug is in-
serted so that the green area is visible, the ra-
dio set will operate from a 12 v d-c source.
NOTE
In "Extender" models, a gray lead ter-
minated in a red coded pin-tip connector
is inserted in a jack in the exposed por-
tion of the voltage receptacle. The jack
is also identified by red coding. This
lead must be inserted in the red coded
jack in the yellow portion of the recepta-
cle for 6 volt operation or the red coded
jack in the green portion of the recepta-
cle for 12 volt operation.
3. TRANSMITTERS
The transmitters provide 30, 50 or 100 watts
r-f power output depending upon the radio setand
transmitter models. Refer to the model chart at
the front of this manual for detailed information.
These transmitters use a transistorized audio
amplifier and IDC ("Instantaneous Deviation Con-
trol'') circuit. Heat radiators dissipate the heat
produced by the driver and power output stages.
4. RECEIVERS
a. "'Extender'' Models
Electrical impulse and ignition noises can
seriously hamper two-way radio communications.
Many methods such as bypassing and shielding of
noise radiating leads have been used in the past
but are effective only in suppressing noise gener-
ated by the particular vehicle in which the
shielding etc. has been done. A large amount of
present two-way radio operation is performed in
close proximity to other vehicles which are not
suppressed.
Each time a spark plug fires or a contact
carrying current to an inductive load opens, a
sharp noise pulse,occurs. This pulse has a very
rapid rise time and contains r-f frequencies
ranging from a few kilocycles to hundreds of
megacycles. These pulses are radiated in much
the same way as r-f signals. In weak signal
areas these pulses can be of sufficient amplitude
to override the desired r-f signal and seriously
affect the operation of conventional receivers.
An ideal noise suppression procedure would
be to block the undesired noise in the receiver
and pass only the desired information to the
speaker. This would effectively suppress im-
pulse noises generated by all vehicles in the area
and greatly extend the operating range of two-
way radio equipment. Motorola's ''Motrac" ra-
dio sets with ''Extender'' operation are equipped
to operate in this manner.
The ''Extender'' circuit samples r-f energy
reaching the antenna, detects the impulse noise
in a separate channel and applies cut-off bias
pulses to the second r-f stage to silence the re-
ceiver for the duration of the impulse noise
bursts. An impulse noise burst is extremely
‘MICROPHONE
INCLUDED
MOTOROLA
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ACCESSORY GROUP CHART
FOR e 7
25-54 MC
“MOTRAC"
00 W
30,50,100 W
FM TWO-WAY MOBILE RADIO SETS
30,50, 100 W
30,50,100 W
30,50,100 W
30,50, 100 W
30,50, 100 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30-50 W
30,50,
30,50,100 W
30,50,100 W
30-50 W
30-50 W
| 30,50,100 Wi
CODE:
&= ONE ITEM SUPPLIED
"EXTENDER" CARRIER §S
12V TRUNK-MOUNT
CARRIER SQUELCH
12V TRUNK-MOUNT
T_izV TRUNK-MOUNT
(A= ONE ITEM SUPPLIED DEPENDING UPON
— CARRIER FREQUENCY.
TYPE OF
INSTALLATION
T2V TRUNK-MOUNT
1z2V TRUNK-MOUNT
12V TRUNK-MOUNT
12V TRUNK-MOUNT
12V DASH-MOUNT
12V DASH-MOUNT
12V DASH-MOUNT
12V DASH-MOUNT
12V TRUNK-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V_DASH-MOUNT
6V DASH-MOUNT
6V_ DASH-MOUNT
6V DASH-MOUNT
6V TRUNK-MOUNT
6V_TRUNK-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V DASH-MOUNT
6V DASH-MOUNT
6V DASH-MOUNT
6V DASH-MOUNT
1zV_TRUNK-MOUNT
12V TRUNK-MOUNT
IzV TRUNK-MOUNT
12V TRUNK-MOUNT
IzV DASH-MOU
12V DASH-MOUNT
12V DASH-MOUNT
12V TRUNK-MOUNT
12V_TRUNK-MOUNT
12V TRUNK-MOUNT
12V DASH-MOUNT
12V DASH-MOUNT
12V_ DASH-MOUNT
12V TRUNK-MOUNT
12V_TRUNK-MOUNT
12V_ TRUNK-MOUNT
12V_ TRUNK-MOUNT
6V_TRUNK-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V_ DASH-MOUNT
6V TRUNK-MOUNT
6V TRUNK-MOUNT
6V. TRUNK-MOUNT
6V TRUNK-MOUNT
6V DASH-MOUNT
6V DASH-MOUNT
6V DASH-MOUNT
NUMBER
DC3155CM
DC3155C
DD3165CM
4A
DD3165C
DD3155C
DE3155BM
DE3155B
DE3165BM
DC1155C
DC1165CM
DC1165C
DD1155CM
DD1155C
DD1165CM
DD1165C
| | DC3055BM
| | DC3055B
| J DC3065BM
| | DC3065B
| DD3055BM _|
DC1055BM
DC1055B
DC1065BM
DC1065B _
DD1055BM
DD1055B
DD1065BM
DC3154AM
DC3164AM
DC3164A
DD3154AM
DD3154A
DD3164AM
DE3154A
DC1154AM
DC1164AM
DC116
DD1154AM
DD1164A
DEI154AM
DE1154A
DE1164AM
DE1164A
DC3054AM
DC3054A
DC3064AM
DD3054A
DC1054AM
DC1054A
DC1064AM
DC1064A
DD1054AM
DD1054A
DD1064AM
DD1064A
DD3065BM
DD3065B
DD3055B
Py pp3054AM | oV DASH-MOUNT 1]
ITEM DESCRIPTION
T TJ
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TCN6046AH [7 CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
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TCN6048AG
TCN6048AH
TCN6046AE
TCN6046AF
TCN6048AE
‘CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., DASH-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., DASH-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ.,
CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ,
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ.
ONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ
TRUNK-MOUNT
TRUNK-MOUNT
DASH-MOUNT
DASH-MOUNT.
michaels pq ebesisahaee ces!
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CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., TRUNK-MOUNT
ONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ, TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ,, TRUNK-MOUNT
ONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ,, TRUNK-MOUNT
ONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ, , DASH-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ,, DASH-MOUNT
Po TT pc3064a
ONT R PE AD A = ONN OR REO DASH -M N
CONTROL HEAD, WITH MIC, CO ECTOR, 2-FREQ DASH-MOUN
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ., TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ,, DASH-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ,, DASH-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ,, TRUNK -MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ., DASH-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., DASH-MOUNT
ONTROL HEAD, WITH MIC ONNE OR, 1-FREQO RUNK-MOUN
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 1-FREQ., DASH-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 2-FREQ., DASH-MOUNT
CONTROL HEAD, WITH MIC, CONNECTOR, 1-FREQ TRUNK-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., TRUNK-MOUNT
ROL HEAD, WITH MIC, CONNECTOR, 1-FREQ,, DASH-MOUNT
CONTROL HEAD, WITH MIC. CONNECTOR, 2-FREQ., DASH-MOUNT
CABLE KIT, 1-FREQ.
CABLE KIT, 2-FREQ.
CABLE KIT, 1-FREQ.
CABLE KIT, 2-FREQ.
CABLE KIT, 1-FREQ,
CABLE KIT, 2-FREQ.
CABLE KIT, 1-FREQ.
CABLE KIT, 2-FREQ.
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ANTENNA, 25-30 MC, TRUNK-MOUNT VV | Yl VY I TA ae om
ANTENNA, 30-54 MC, TRUNK-MOUNT BnWWV8 44488 Be
ANTENNA, 25-30 MC, DASH-MOUNT Ba
ANTENNA, 30-54 MC, DASH-MOUNT
MOUNTING BRACKET KIT
NOISE REDUCTION KIT
KZ
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EPD-6482-B
DESCRIPTION
1. INTRODUCTION
The Motorola ''Motrac'! radio is a mobile
FM two-way radio with a fully transistorized re-
ceiver and power supply. The advantages of the
transistor -- reliability, lightweight, compact
size, reduced maintenance and operating costs
-- are fully utilized. A wide variety of models
are available with 30, 50 or 100 watt transmitter
r-f power output, ''Extender'' operation, carrier
or dual squelch ''Private-Line'' operation and+12
volt or 6/12 volt primary inputs. Refer to the
model chart at the front of this manual for a
listing of the various models available in the
25-54 mc frequency range.
2. PRIMARY POWER
a. +12 VDC Models
The power supplies used in +12 v d-c models
are equipped with a polarity reversing plug and
receptacle. Positive (+) ground operation is ac-
complished by inserting the plug in the recepta-
cle so that the red area of the receptacle is visi-
ble. Negative (-) ground operation is accom-
plished by inserting the plug so that the white
area of the receptacle is visible.
b. +£6/12 VDC Models
The power supplies used in +6/12 v d-c
models are equipped with a voltage plug and re-
ceptacle in addition to the polarity plug and re-
ceptacle previously described for +12 v d-c
models. When the voltage plug is inserted in the
receptacle so that the yellow portion of the re-
ceptacle is visible, the radio set will operate
from a 6 v d-c source. When the plug is in-
serted so that the green area is visible, the ra-
dio set will operate from a 12 v d-c source.
NOTE
In '"Extender'' models, a gray lead ter-
minated in a red coded pin-tip connector
is inserted in a jack in the exposed por-
tion of the voltage receptacle. The jack
is also identified by red coding. This
lead must be inserted in the red coded
jack in the yellow portion of the recepta-
cle for 6 volt operation or the red coded
jack in the green portion of the recepta-
cle for 12 volt operation.
3. TRANSMITTERS
The transmitters provide 30, 50 or 100 watts
r-f power output depending upon the radio setand
transmitter models. Refer to the model chart at
the front of this manual for detailed information.
These transmitters use a transistorized audio
amplifier and IDC ("Instantaneous Deviation Con-
trol") circuit. Heat radiators dissipate the heat
produced by the driver and power output stages.
4. RECEIVERS
ans "Kixtender'' Models
Electrical impulse and ignition noises can
seriously hamper two-way radio communications.
Many methods such as bypassing and shielding of
noise radiating leads have been used in the past
but are effective only in suppressing noise gener-
ated by the particular vehicle in which the
shielding etc. has been done. A large amount of
present two-way radio operation is performed in
close proximity to other vehicles which are not
suppressed.
Each time a spark plug fires or a contact
carrying current to an inductive load opens, a
sharp noise pulse occurs. This pulse has a very
rapid rise time and contains r-f frequencies
ranging from a few kilocycles to hundreds of
megacycles. These pulses are radiated in much
the same way as r-f signals. In weak signal
areas these pulses can be of sufficient amplitude
to override the desired r-f signal and seriously
affect the operation of conventional receivers.
An ideal noise suppression procedure would
be to block the undesired noise in the receiver
and pass only the desired information to the
speaker. This would effectively suppress im-
pulse noises generated by all vehicles in the area
and greatly extend the operating range of two-
way radio equipment. Motorola's ''Motrac'"! ra-
dio sets with ''Extender'' operation are equipped
to operate in this manner.
The ''Extender'' circuit samples r-f energy
reaching the antenna, detects the impulse noise
in a separate channel and applies cut-off bias
pulses to the second r-f stage to silence the re-
ceiver for the duration of the impulse noise
bursts. An impulse noise burst is extremely
short in duration (a few microseconds) and si-
lencing the receiver for this period of time does
not remove desired information from the re-
ceived signal. The time required to transmit a
single syllable can exceed the duration of an im-
pulse noise burst by a ratio somewhere in the
vicinity of 100,000 to l.
b. Carrier Squelch Models
These models include a noise-actuated
squelch circuit consisting of a noise limiter, a
noise detector and a d-c control stage (switching
circuit) to cut off the audio amplifier. This
eliminates disturbing noise which would other-
wise be heard at the speaker during intervals
between received messages.
c. Dual Squelch ''Private-Line'' Models
These radio sets are an improvement in FM
two-way radio equipment especially when oper-
ating under crowded channel conditions. Several
"Private-Line'' networks can use the same r-f
carrier frequency in the same area when each
network uses a different ''Private-Line"' tone fre-
quency.
The transmitters are modulated by a con-
tinuous sub-audio frequency tone signal in ad-
dition to the voice modulation. The receivers
accept only correctly tone-modulated signals
when the 'PL''-ON-OFF switch is in the ON po-
sition and reject all others.
Dual squelch ''Private-Line'' models also
include noise-actuated squelch circuitry as pre-
viously described for carrier squelch models.
This enables the operator to monitor the channel
before transmissions (''PL''-ON-OFF switch in
OFF position) and prevent interference with other
users of the frequency. The TLN6246A Hang-Up
Switch Box is available as an optional accessory
to provide automatic switching to the noise-
actuated squelch circuit when the microphone is
pickedsup,
The squelch control is not used in ''Private-
Line" operation and the setting of it does not af-
fect the "Private-Line'' circuit.
(noise-actuated) squelch operation, however, it
must be set for proper operation as described
under OPERATING INSTRUCTIONS.
In carrier
In dual squelch ''Private-Line'' models, the
"Private-Line'' circuit is operative at all times.
The ''PL"'-ON-OFF switch on the control head
places the noise-actuated squelch circuit in or
out of operation.
5. POWER SUPPLIES
The fully transistorized power supplies use
long-life transistors in place of vibrator units.
Vibrator replacement costs are eliminated and
at the same time the overall radio set operation
is improved. Silicon diode rectifiers are used
to provide the greatest efficiency. All operating
voltages for the transmitter are provided by the
power supply. Heat sinks along the sides of the
housing surround the power supply transistors.
6. BATTERY SAVER FEATURE
A unique feature of the ''Motrac'' radio set
is the "battery saver'' circuit. This circuit per-
mits the power to be removed from the trans -
mitter filaments and associated power supply
when the radio set is used for receive operation
only. The "battery saver'' feature frequently
eliminates the need for special generators and
engine idling to supply current for radio oper-
ation. Thus, gas consumption and maintenance
costs of the vehicle are greatly reduced. The
receiver operates independently of the trans-
mitter and associated power supply. The battery
power for the transmitter filaments and power
supply is supplied through the vehicle ignition
switch, while the power for the receiver is ap-
plied directly. Therefore, with the ignition
switch "off'' and the radio set ''on'', the battery
is used for the receiver only.
Power consumption is minimized by the use
of transistors in the receiver. Actual current
drain during standby operation (''battery saver"
in operation and the crystal heaters off) is only
350 milliamperes (13.8 v d-c input) or 2.1 am-
peres (6.6 v d-c input). The low drain insures a
longer battery life compared with a conventional
higher drain radio set that uses vacuum tubes
and is not equipped with the "battery saver'! fea-
LUsser
If desired, the standby primary current
drain in models equipped with 12 volt control
heads can be reduced to approximately 150 ma.
This is done by relocating the electrical connec-
tions to the green pilot lamp in the control head.
Although not normally recommended, this may
be done when extremely low primary current
drain is required. Refer to the INSTALLATION
AND OPERATION section of this manual for in-
structions.
NOTE
This modification cannot be made in
6 volt control heads.
CE1979B
MC6069
7. THE NETTING SWITCH
A netting switch, exclusive with 'Motrac"
radio equipment, allows a rapid check and ad-
justment of receiver and transmitter frequencies,
Pressing this switch causes the receiver and
transmitter to function simultaneously. If one of
the two units is known to be ''on frequency" the
oscillator of the other may then be adjusted by
the serviceman with a minimum of test equip-
ment.
8. HOUSING
The basic radio set consists of a trans-
mitter, receiver and power supply assembled
together to form a drawer unit which slides into
the housing. All external connections are made
through receptacles on the front panel.
The 'Motrac" radio set uses heat sinks (ra-
diators) to dissipate heat generated in the power
supply and transmitter so that venting of the hou-
sing is unnecessary. This keeps components
free of dust etc. and eliminates servicing re-
sulting from entrance of contaminants through a
vented housing.
The radio set housing can be mounted either
under the vehicle dashboard or in the trunk. The
same drawer assembly; including transmitter,
receiver and power supply, slides into the hou-
sing in either type of installation. In mobile ra-
dio fleets, where both dash and trunk-mount in-
stallations are used, this design provides full
flexibility in exchanging radio sets between vehi-
cles. Trunk-mounted radio sets are remotely
controlled by means of a dash-mounted control
head.
A chrome plated bar is attached to the front
panel. When the bar is pulled up and outward, it
becomes a carrying handle. A key lock is also
mounted on the front panel to secure the drawer
assembly from unauthorized persons.
For servicing purposes, the major chassis
are easily accessible by removing the drawer
unit from the housing. This provides access to
all components in the radio set. Refer to the
SERVICE AIDS section of this manual for in-
structions on the removal of individual compo-
nents.
9. ACCESSORY GROUPS
In addition to the basic radio set, an acces-
sory group is required to complete the installation.
Various combinations of accessories are available
to meet specific requirements. The accessory
groups are listed in the Accessory Group Model
Chart in the front part of this manual.
The control heads available as part of the
accessory groups provide all the required con-
trol facilities for operation of the radio set. The
dash-mount control heads plug directly into the
front panel. Trunk-mount control heads have an
adjustable angle-bracket for mounting to the ve-
hicle dash, and are connected to the radio set
via a cable kit.
The microphone used with the ''Motrac" ra-
dio set is a palm-type, dynamic microphone with
a transistorized pre-amplifier. The microphone
has a 12 inch tinsel coiled-cord and a four-pin
connector for plugging into the receptacle on the
control head.
Special mounting brackets are included with
all dash-mount accessory groups to mount the
radio set in the passenger compartment of the
vehicle. The brackets can be assembled in a
number of different ways, thus providing various
combinations of mounting angles and positions.
If desired, 6volt accessories can be converted
for 12 volt operation. Refertothe SERIVCE AIDS
section of this manual for conversion instructions.
10. OPTIONAL ACCESSORIES
TLN6246A HANG-UP SWITCH BOX FOR
DUAL SQUELCH "PRIVATE-LINE'" MODELS
Provides automatic switching tothe carrier squelch
circuit when the microphone is picked up.
TMN6006A DYNAMIC HANDSET
The handset has a 4-pin connector for plugging
directly into the control head receptacle.
4
RECOMMENDED TEST EQUIPMENT
P-7208
S1059A* T1012A WATT METER
PORTABLE TEST SET POWER SUPPLY DUMMY LOAD
S1051B TEK-1A
S1063A TRANSISTORIZED AC TRANSISTORIZED TONE
DC MULTIMETER VOLTMETER GENERATOR
: T1034B T1015A T1014B
IGNAL GENERATOR GENERAL PURPOSE PRECISION WIDE BAND
OSCILLOSCOPE OSCILLOSCOPE
T1020A TEK-21 T1100A SERIES
FREQUENCY AND PULSE GENERATOR FM STATION MONITOR
DEVIATION MONITOR
*For use with ''Motrac'' radio sets, order TKN6025A Cable Adapter.
AEPD-6684-O (MC5293)
CE1630C AEPD-7846-O (MC7794) AEPD-6626-O (MC6863)
MC1971 MC5744 AEPD-7707-O (MC7460)
AEPD-7808-O (MC7763)
CE1260B AEPD-6933-O (MC6826)
CE2114 AEPD-6901-O (MC7131)
INSTALLATION AND OPERATION
1. INSTALLING THE RADIO SET
Complete installation instructions are packed
in the shipping carton with the radio set.
Install
the radio set according to the instructions sup-
plied.
2. OPERATING INSTRUCTIONS
CAUTION
Before operating the ''Motrac"' radio set
make sure that the polarity and/or volt-
age plugs in the power supply are in the
proper positions as described in the in-
stallation instructions.
TO RECEIVE
2-FREQ. MODELS
ONLY
Place the F1-F2 switch in
the desired position.
Place the ON-OFF switch
in the ON position or turn
the OF F-VOLUME control
clockwise. The green
lamp will go on to indicate
the ''standby"' condition.
The receiver is in full
operation.
TO HEAR ALL ON-FREQUENCY SIGNALS
DUAL SQUELCH
"PRIVATE-LINE"
MODELS ONLY
"EXTENDER"
MODELS
ONLY
Place the '"PL'' ON-OFF
switch in the OFF posi-
tion.
Place the EXTEND-STD-
REJECT switch in the
EXTEND position.
Turn the SQUELCH con-
trol to the full counter-
clockwise position.
the VOLUME control
clockwise until noise is
heard. Adjust the
SQUELCH control by
turning it slowly clockwise
until the noise is just
squelched (cuts out). Set
the VOLUME control to
the desired listening level
Turn:
with a received signal.
TO HEAR ALL ON-FREQUENCY SIGNALS
(CONTINUED)
"EXTENDER"
MODELS
ONLY
In strong signal areas
where interfering signals
can be present, place the
EXTEND-STD-REJECT
switch in the REJECT po-
sition.
TO HEAR "PRIVATE-LINE" SIGNALS ONLY
ALL
DUAL SQUELCH
"PRIVATE-LINE"
MODELS
DUAL SQUELCH
"PRIVATE-LINE"
MODELS WITH
"EXTENDER"
OPERATION
Place the "'"PL'' ON-OFF
switch in the ON position.
Set the VOLUME control
to the desired listening
level with a received
signal.
In weak signal areas
where the noise level-is
high, place the EXTEND-
STD-REJECT switch in
the EXTEND position. In
strong signal areas where
interfering signals can be
present, place the switch
in the REJECT position.
TO TRANSMIT
Proceed as previously de-
scribed under ''TO RE-
CEIVE" and 'TO HEAR
ALL ON-FREQUENCY
SIGNALS". Turn "on" the
vehicle ignition switch in
12 volt systems or the
transmitter filament
switch in 6 volt systems
and allow about 45 seconds
for the transmitter tubes
to warm up. For short
transmissions it is not
necessary to start the en-
gine; however, to con-
serve the battery, the en-
gine should be running.
When the channel is clear,
remove the microphone
from the hang-up bracket.
Hold it about one inch
from the lips and turned
TO TRANSMIT (CONTINUED)
about 30° away from the
face. Press the push-to-
talk button. The red lamp
will come on and the
transmitter will go ''on the
air''. Speak slowly and
clearly across the micro-
phone in a normal or
slightly louder than nor-
mal voice. At the end of
the message, release the
push-to-talk button and
replace the microphone in
the hang-up bracket.
TO TURN OFF
Place the ON-OFF switch
in the OFF position--or--
turn the OFF -VOLUME
control counterclockwise
until a click is heard.
3. LOW CURRENT DRAIN MODIFICATION
FOR 12 VOLT SYSTEMS
If desired, an additional saving in battery
current drain of about 200 ma (in the standby
condition) may be obtained by a wiring modifica-
tion in the control head. If this modification is
incorporated, the green pilot lamp will not oper-
ate until the ignition switch and the transmitter
filaments are turned on. Proceed as follows to
complete the modification.
a. Loosen the two mounting screws and re-
move the control head.
b. Remove the 33 ohm, 2 watt resistor con-
nected between a terminalonthe rear of the OFF -
VOLUME control or ON-OFF switch (depending
on the model) and the green pilot lamp socket.
c. Connect a 33 ohm, 2 watt resistor between
the terminal with the brown lead attached to it
on the red pilot lamp socket and the original con-
nection on the green pilot lamp socket.
NOTE
No current-reduction modification can
be made in 6-volt control heads.
63C 868034-C
THEORY OF
1. +12 VOLT FUNCTIONAL OPERATION
The overall operation of the +12 volt radio set
is illustrated in the Functional Block Diagram in
figure 1A. This diagram applies to both dash
mount and trunk-mount installations.
The d-c input to the radio setis controlled
by the control head power on-off switch and the
vehicle ignition switch. The circuit from the un-
grounded side of the battery through the vehicle
ignition switch to the power on-off switch is the
battery saver circuit.
When the power on-off switch is on, the
battery voltage is applied to the receiver through
normally closed contacts of the transmit relay in
the power supply. This places the receiver in
POWER SUPPLY
+42 VOLT "MOTRAC"
RADIO SET
NOTE:
P-T-T CONNECTION IS
DIRECTLY TO TRANSMIT-
RECEIVE RELAY IN CARRIER
SQUELCH MODELS ONLY.
DIAGRAM NO. 630868034
VEHICLE
BATTERY
CONTROL
HEAD
OPERATION
"standby" operation. At this time the greenlamp
on the control head will be energized.
When the power on-off switch and the ignition
switch are both on, the radio is in the ''receive"'
condition.
When the ignition and control head switches
are on and the microphone push-to-talk button
is pressed, the transmit relay is energized. In
"Private-Line" models the ground circuit to the
transmit relay is completed through contacts of
the squelch tail eliminator relay and both relays
are energized. When the relay(s) is energized,
the radio set is in the transmit condition and the
following functions are performed:
a. Battery voltage is applied to the power supply
transistor switching circuit.
TRANSMITTER
SECONDARY
RECTIFIER
&
FILTER
NETWORKS
FILAMENTS
ANTENNA
MIC. AUDIO INPUT
XTAL OVEN
TONE IN
(DUAL SQ. ONLY)
R-F OUTPUT
RECEIVER
AUDIO
OUTPUT
SQUELCH TAIL
ELIMINATOR RELAY
Figure 1A,
+12 Volt Functional Block Diagram
b. The antenna relay is energized and the an-
tenna is switched from the receiver to the trans-
mitter.
c. Battery voltage is disconnected and the re-
ceiver is muted.
d. Bt is applied to the transmitter (from the
power supply) and d-c is routed to the microphone
for operation of the microphone transistorized
pre-amplifier.
e. The redlamponthe control headis energized
to indicate the transmit condition.
When the microphone push-to-talk button is
released in dual squelch models, the squelch tail
eliminator relay releases immediately and the
following functions are performed:
i. The slow-release transmit relay holds for
approximately 150 milliseconds.
g. During this period of time the transmitter
carrier is modulated by an out-of-phase tone,
obtained through switched contacts of the squelch
tail eliminator relay, which damps the vibrations
of the ''Vibrasponder'' resonant reed in the
"listening'’ receiver and returns it to a squelched
condition.
h. The transmit relay and antenna relay re-
lease.
iy The transmitter goes off the air. The re-
ceiver is back in operation. The red light goes
out.
2. +6/12 VOLT FUNCTIONAL OPERATION
The overall operation of the 6/12 volt radio
set is illustrated in the functional block diagram
in figure 1B. This diagram applies to both dash-
mount and trunk-mount installations.
The d-c input to the radio set is controlled
by the control head power on-off switch, the ve-
hicle ignition switch or the TRANS FILAMENT
switch, anda heavy duty contact on the transmit-
receive relay. The circuit from the ungrounded
side of the battery through the vehicle ignition
switch to the power on-off switch is the battery
saver circuit for 12-volt models. On 6-volt
models, the battery saver feature is in the trans-
mitter filament switch.
In 12 volt operation when the power on-off
switch is on, voltage is applied directly to the re-
ceiver through normally closed contacts of the
transmit relay in the power supply. In 6-volt
operation the power supply operates to supply
voltage to the receiver through normally closed
contacts of the transmit relay. This places the
receiver in standby operation.
When the ignition switch or transmitter fila-
ment switch is ON and the microphone push-to-
talk button is pressed, the transmit relay is
energized. This places the radio set in the trans-
mit condition. The battery saver feature com-
pletes the circuit from the ungrounded side of the
battery to one side of the relay coil; the micro-
phone button completes the ground circuit to the
other side of the relay coil. In 12 volt operation
a resistor is inserted in series with the 6-volt
relay coil. When the relay is energized, various
functions are performed as follows:
a. Battery voltage is applied through the main
power cable to energize the power supply tran-
sistor switching circuit in 12 volt operation. In
6 volt operation, additional power is supplied to
the power supply through the main power cable.
b. The antenna relay is energized and the an-
tenna is switched from the receiver to the trans-
mitter.
(oy The A+ circuit to the receiver is broken;
therefore the receiver is muted.
d. B+ is applied to the transmitter (from the
power supply) and d-c is routed to the microphone
for operation of the microphone transistorized
pre-amplifier.
e. The red lamp on the control head is energized
to indicate the transmit condition.
ix The transmitter is on the air.
When the microphone push-to-talk button is
released in dual squelch ''Private-Line" models,
the squelch tail eliminator relay releases im-
mediately and the following functions are per-
formed:
g. The slow-release transmit relay holds for
approximately 150 milliseconds,
h. During this period of time the transmitter
carrier is modulated by an out-of-phase tone, ob-
tained through switched contacts of the squelch
tail eliminator relay, which damps the vibrations
of the ''Vibrasponder'' resonant reed in the
63C868012-D
6 VOLT
OSCILLATOR
SECONDARY
RECTIFIER
&
FILTER
NETWORKS
NOTES:
4. P-T-T CONNECTION IS DIRECTLY TO
TRANSMIT-RECEIVE RELAY IN CARRIER
SQUELCH MODELS ONLY.
2. CONNECTION IS STRAIGHT THROUGH IN
42 VOLT SYSTEMS.
6 VOLT
; OSCILLATOR ee
BIAS
TRANSMITTER
FILAMENTS
MIC AUDIO INPUT
XTAL HEATER
pf TONE INPUT
(DUAL SQ. ONLY)
RF OUTPUT
VEHICLE
BATTERY
IGNITION
SWITCH
ANTENNA
S ANTENNA
| RELAY
RF INPUT
MICROPHONE
VOLTAGE AND
POLARITY
SELECTORS
XTAL HEATER
RECEIVER
VOLTAGE SOURCE
FILAMENT
H VOLTAGE SOURCE
| +6V
'OR 12V] STANDBY
VOLTAGE SOURCE
TONE OSCILLATOR
(DUAL SQUELCH ONLY)
POWER ON-OFF
SWITCH
CONTROL HEAD
TRANSMIT- RECEIVE
RELAY
P/O FILAMENT SWITCH
(6V ONLY) SEE NOTE 2
SPEAKER
SPEAKER AUDIO DIAGRAM NO, 63C868012
Figure 1B.
+6/12 Volt Functional Block Diagram
"listening"’ receiver and returns it to a squelched The two-frequency receiver is the same as
condition. the one-frequency except for the addition of
another first oscillator and control crystal. Only
2, The transmit relay and antenna relay one frequency can be received at a time. A
release. switch (F1-F2) on the control head selects the
frequencies. In the Fl position, the switch com-
Ae The transmitter goes off the air. The re- pletes the d-c path to A- for the transistor of the
ceiver is back in operation. The red light goes #1 oscillator, permitting that stage to operate.
out. At the same time it opens the d-c path to A- for
the transistor of the #2 oscillator, disabling the
Refer to the schematic and block diagrams to #2 stage. In the F2 position, the switch reverses
follow the circuitry and the detailed explanation the connections and selects the #2 oscillator.
of the radio set operation covered in the following
paragraphs. a. RF Amplifier
3. RECEIVER The r-f amplifier consists of two common
emitter transistor stages. The carrier signals
The receiver is a completely transistorized received at the antenna are coupled to the base
double-conversion superheterodyne type. It re- of the first r-f amplifier by the impedance-match-
ceives FM signals on one (or two) fixed, crystal- ing network in the input circuit. The two r-f
controlled frequencies in the 25-54 mc band. stages of amplification create and improve sen-
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Figure 2.
Receiver Block Diagram
10
sitivity and selectivity. The gain of these stages
provides the optimum signal-to-noise ratio in
the signals sent to the first mixer. Selectiv-
ity is provided by use of very low-loss coils and
by critically coupling both the input and output
circuits.
ibe Radio and ''Extender'' Channels in ''Extender'"'
Models
When the EXTEND-STD-REJECT switch is
in the EXTEND position, the r-f signal and im-
pulse noise bursts enter two parallel paths or
channels. The ''radio'' channel consists of com-
mon emitter and common base r-f amplifiers
tuned to the r-f carrier frequency. These stages
are separated by a time delay network. The '"'Ex-
tender'' channel consists of three r-f amplifier
stages tuned to a ''sampling'" frequency, an AM
pulse detector, a high pass filter and three pulse
amplifier stages. Impulse noise bursts detected
in the "'Extender'' channel are amplified and
shaped to form bias pulses. The negative bias
pulses are applied to the emitter circuit of the
second r-f amplifier in the "'radio" channel to cut
off the transistor for the duration of the impulse
noise bursts. This prevents impulse noise from
entering the remainder of the receiver and being
heard at the speaker. The delay line is inserted
in the "radio'' channel to insure that the bias
pulses from the "Extender" channel arrive at the
second r-f amplifier in the ''radio" channel at the
same time or slightly before the impulse noise
bursts traveling through the ''radio" channel.
In the ''Extender"' channel, the impulse noise
bursts are amplified in three r-f amplifier stages.
The output of the third r-f amplifier enters a
detector which responds to amplitude variations
(noise) at the ''sampling" frequency.
The detector output (pulses) is coupled to the
pulse amplifiers through a gate circuit consisting
of two diodes. The gate circuit establishes a
reference level which allows only pulses generated
by impulse noise bursts to pass through to the pulse
amplifiers. This prevents generation of blanking
pulses by inherent receiver noise. Positive
pulses arriving at the first pulse amplifier result
in an increase in collector current. The rapid
increase in collector current starts a ringing or
flywheel effect in the output. The positive portion
of the ringing alternation is removed and the
negative portion is coupled to the second pulse
amplifier. The pulse undergoes phase reversals
in the second and third pulse amplifiers and
arrives at the emitter circuit of the second r-f
amplifier as a negative pulse to cut off the stage
for the duration of the impulse noise burst.
The broad frequency characteristics of im-
pulse noise permit tuning of the ''Extender"' chan-
nel to frequencies other than the desired rfcar-
rier. This does notaffect operation of the ''radio"
or 'Extender'' channels and can be used to advan
tage when interfering signals are present. The
"sampling'' frequencies listed in the following
table are suggested for most installations and
the radio sets are tuned to these frequencies at
the factory.
"SAMPLING" FREQUENCY TABLE
CARRIER "SAMPLING" FREQ. FOR
FREQ. "EXTENDER" CHANNEL
25-25.5 MC
25.5-26 MC
26-28 MC
28-30 MC
30-31 MC
31-36 MC
36-38 MC
38-40 MC
40-42 MC
42-48.5 MC
48.5-50 MC
NOTE
"Sampling" frequencies as listed in the
table are suggested. However, in the
event of interference the ''Extender"!
channel can be tuned to aclear channel
without any change in performance of
the "radio'' or "Extender' channels.
Avoid tuning the ''Extender"' channel to
the desired r-f carrier frequency or
within 2 mc of the local oscillator fre-
quency. A small degradationin receiver
sensitivity will occur due to interaction
of the two antenna coils when aligned to
the r-f carrier frequency. The presence
of strong signals from the local oscillator
can desensitize the ''Extender" channel
when it is aligned within 2 mc of the local
oscillator frequency.
An automatic sensitivity control circuit am-
plifies and rectifies a portion of the output of the
first 5.5 mci-f amplifier. The d-c output of this
circuit is fed back to the second r-f amplifier in
the ''Extender' channel as a reverse bias. Strong
signals reaching the antenna (100-500 microvolts)
cause the emitter-to-base voltage of the second
r-f amplifier in the ''Extender'' channel to drop to
zero. This cuts off the stage and disables the
"Extender" channel.
The receiver is protected from degradation
caused by "'beat'' frequencies or heterodyne
11
section produced by strong signals entering the
"Extender" channel. A parallel r-c network, in-
serted between the output of the 'Extender'"!
channel and the "radio" channel, forms a "rate-
shut-off" circuit which disables the "Extender"
channel when this type of interference is present.
These signals are generally present intermittently
and would cause a corresponding intermittent
change in "Extender" performance. Elimination
of this type of problem in severe cases can be
accomplished by simply retuning the ''Extender"
channel to a clear "sampling" frequency.
The "Extender'' circuit improves two-way
radio communications by the elimination of in-
terference caused by impulse noise bursts.
Maximum efficiency is obtained when good ve-
hicle maintenance practices are observed. Checks
for poor connections in ignition wiring and ''opens'!
in resistive wiring should be performed period-
ically.
When the EXTEND-STD-REJECT switch is
in the REJECT position, negative feedback is ap-
plied to the first r-f amplifier in the "radio"
channel to reduce the "front end" gain of the re-
ceiver for suppression of interfering signals.
When the EXTEND-STD-REJECT switch is
inthe STDposition, d-c supply voltage is removed
from the "Extender" channel and it becomes in-
operative.
CHS Oscillator
The first oscillator stage has a high degree
of stability with respect to thermal, mechanical
and electrical variations. The oscillator fre-
quency is controlled by a crystal operating at a
specific frequency within the 30.500 to 48.500
mc range.
The oscillator output is coupled to the first
mixer.
d. First Mixer
The first mixer heterodynes the signal from
the r-f amplifier with the signals from the first
oscillator to produce the first intermediate fre-
quency (1st i-f) of 5.5 mc. Z.
The first oscillator frequency is above the
r-f carrier frequency in receivers operating be-
12
tween 25 and 42 mc. The first oscillator frequen-
cy is below the r-f carrier frequency in receivers
operating between 42 and 54 mc. The difference
frequency is equal to the first i-f 5.5 mc.
These frequency relationships are as follows:
For the 25-42 mc range:
ms '5).5 5) SAGE
— ae
first r-f carrier first
oscillator frequency mixer
frequency output
(first i-f)
For the 42-54 mc range:
Ons Or Dune
pee ae
r-f carrier lst osc. lst mixer output
frequency frequency (1st i-f)
e. First IF and Second Mixer
The first i-f section consists of two capaci-
tor-tuned amplifiers and four very high Q to-
roidal coils with tuned circuits. Low insertion
loss and very high-Q toroidals coils are used to
provide high selectivity. The output from the
first mixer is matched to a low-impedance coil
and inductively coupled to a high-impedance coil.
The high-impedance coil is capacitively -coupled
to another high-impedance coil providing selec-
tivity. The impedance is stepped-down to match
the low input impedance to the base of the i-f
amplifier.
The outputs of the 5.5 mc i-f amplifier and
the 2nd local oscillator are applied to the 2nd
mixer circuit. The crystal-controlled 2nd oscil-
lator operates above the lst i-f at 5.955 mc ex-
cept in the case where the receiver is tuned near
harmonics of this frequency. To avoid inter-
ference from these harmonics a crystal which
oscillates below the lst i-f at 5.045 mc is used
when the receiver is tuned to the following fre-
quencies:
fae (ieee
35. (2 mec throwgh35.. (4 mc
41.68 mc through 41.70 mc
47.64 mc
53,58 toc through 53570) me
BEPD-1818-0O
The 5.955 mc crystal is 455 kc above the
5.5 mc lst i-f and the 5.045 mc crystal is 455 kc
below it. The output of the 2nd mixer is the dif-
ference between the 2nd local oscillator and the
5.5 mc i-f. This frequency is 455 kc and is
called the 2nd i-f.
£ Second IF
A "Permakay" i-f filter is used in the second
i-f before the amplification stages. This filter
is permanently sealed in polyesterstyrene and is
unconditionally guaranteed for the life of the re-
ceiver, provided the seal is unbroken and the
housing is not tampered with. This filter is the
major factor in determining the bandwidth and
selectivity of the receiver. It greatly attenuates
the signal outside the pre-determined pass-band.
Three i-f amplifier stages follow the 455 kc fil-
ter to saturate the limiter.
g. Limiter Stage
The two limiter stages are 455 kc amplifiers
arranged so that an increase in input signal
produces no change in the amplitude of the output
signal. Operation of the limiter depends upon the
application of a large amplitude signal. The li-
miters are in full saturation at all times, thatis,
with weak or strong signals or noise only.
When a signal is applied to the NPN first li-
miter, the base is driven negative with respect
to the emitter during the negative alternation of
the signal. This places a reverse bias at the
emitter-base junction causing the collector cur-
rent to drop to zero. During the positive half of
the input signal, the base becomes more positive,
increasing the emitter-to-collector current to
its maximum value. Thus with a signal, the col-
lector current is driven to cut-off and maximum.
Operation of the second limiter is essentially the
same except that the signal undergoes a phase
reversal in the first limiter and the PNP tran-
sistor performs the same functions when its in-
put signal is of opposite polarity. The output of
the limiters is a signal of constant amplitude.
h. Discriminator
The discriminator used is a phase discrim-
inator, that is, the operation is dependent upon a
90° phase shift which occurs at resonance be-
tween the primary and secondary voltages of the
tuned transformer.
The discriminator recovers the audio from
the 455 kc i-f signal. A typical discriminator
response curve is shown in figure 3.
OUTPUT VOLTAGE
(oe)
NOTE:
VALUES DO
TIME NOT CORRES-
+ POND WITH
ANY GIVEN
Oi RECEIVER.
FREQUENCY OF I-F SIGNAL (KC)
Figure 3.
Typical Discriminator Response
The i-f signal varies in frequency at the
audio rate. This is shown below the curve. The
corresponding audio output is drawn to the right
of the curve.
i. Noise-Actuated Squelch Circuit
The purpose of the squelch circuit is to
eliminate disturbing noise which would otherwise
be heard at the speaker during intervals between
received messages.
The noise-actuated squelch circuit consists of
a noise limiter, noise detector (rectifier) andtran-
sistorized d-c control stage (switching circuit).
In the absence of a received r-f carrier
(SQUELCH control at threshold), noise from the
discriminator is amplified by the noise amplifier
limiter. This noise voltage is rectified in the
form of drawing more or less current in the
noise detector stage. More current is drawn
when the receiver is fully squelched (SQUELCH
control fully clockwise); less currentis drawn
when the receiver is in the unsquelched condition.
When the noise detector is drawing heavy
current, a less positive voltage is developed at
the emitter element of the detector. This causes
a heavy forward bias to be applied to the switch-
ing transistor which results in a heavy current
through the transistor. This in turn reverse
biases the first audio amplifier stage cutting off
the stage. Therefore, the following audio stages
do not receive signals and the speaker is quiet.
When an on-frequency signal is received,
13
the noise reaching the squelch circuit diminishes
entirely, so that there is little or no output from
the noise detector. Asa result, the d-c control
stage appears as an open switch and the audio
amplifier is biased normally. Under these con-
ditions, the incoming signals reach the speaker.
j. Tone-Actuated Squelch Circuit in Dual
Squelch Models
The ''Private-Line" (PL) squelch circuit con-
sists of a low-pass filter network, high-gain am-
plifier, ''Vibrasponder" driver-limiter and a
"Vibrasponder" resonant reed.
The output from the discriminator is con-
nected to the low-pass filter network, which pass-
es frequencies below the audio range, that is,
below 300 cps. The low-frequency signals (PL
tone) are amplified and coupled to the input of
the ''Vibrasponder" driver. The driver stage
provides the output requiredfor driving the reso-
nant reed. Thus, in ''Private-Line'" operation
the r-f carrier is always modulated by the as-
signed, PL tone, which after being detected and
amplified, energizes the resonant reed. If a dif-
ferent tone is present with the r-f carrier, the
reed will not respond due to its highly selective
design. The driver output is applied to the reso-
nant reed coil through a capacitor to complete
the PL tone path. The resonant reed is perma-
nently tuned and sealed at the factory. The reed
vibrates in response to the incoming tone signal
from the transmitter. The vibrating reed makes
intermittent contact with a fixed point on the
mechanism framework. A capacitor in the reso-
nant reed output gives a time constant sufficient
to provide a steady d-c voltage for biasing the
switching transistor. The low-pass filter is
paralleled by a high-pass circuit to prevent er-
ratic action of the ''Vibrasponder" resonant reed
circuit caused by noise. When the proper tone
signal is received and the audio amplifier is
"turned on'', the high-pass path is shorted to A-
through a diode that is forward biased by current’
flow in the audio amplifier.
k. Switching Transistor Stage
The base of the switching transistor is the
control point of the entire squelch circuit. The
output of the noise squelch circuit (and the output
of the PL squelch circuit in dual squelch models)
is connected to this point.
In dual squelch models with the PL switch
ON, the noise squelch circuit is disconnected
from the discriminator output and forward bias
14
is applied to the switching transistor. Thus,
only the PL squelch circuit is usable. When the
PL squelch circuit output is applied to the base
of the switching transistor, the transistor is
biased to cut-off and appears as an open switch.
Under open switch conditions, less current is
drawn through the emitter resistor of the
switching transistor and the first audio amplifier
is biased normally, allowing the incoming signals
to reach the speaker.
In dual squelch models with the PL switch in
the OFF position or in carrier squelch models,
the discriminator noise output is connected to
the input of the noise-squelch circuit, through
the SQUELCH control on the control head, and
the fixed forward bias is removed. Under these
conditions, the noise-squelch circuit output is
applied to the base of the switching transistor,
biasing it into conduction. Therefore, any car-
rier (modulated or unmodulated) will activate the
noise-squelch circuit and pass the signals on to
the speaker.
In dual squelch models the PL squelch cir-
cuit is operative at all times. The PL switch on
the control head actually switches the noise-
squelch circuit in or out.
Ihe Audio Circuit
Audio signals from the discriminator are
coupled to the first audio stage through the
VOLUME control (located on the control head).
The VOLUME control varies the signal level
applied to the base of the first audio amplifier.
The audio signals are amplified in the push-pull
driver amplifier stage and further amplified in
the push-pull power output stage. The output
stage provides a 5 watt output to a 3 ohm speaker
with less than 10% distortion. Response is within
+1, -8 db of the 6 db per octave de-emphasis
characteristic between 300 and 3000 cps.
4. TRANSMITTER
The transmitter is phase-modulated and
operates on crystal-controlled frequencies with-
in the 25-54 mc band. The power output is 30,
50, or 100 watts depending upon the radio model.
The transmitter consists of a crystal-controlled
oscillator (two oscillators in two-frequency
models), a phase-modulator, three stages of
frequency multiplication and a final amplifier
stage. The fundamental crystal frequency is
multiplied 12 times to provide the final r-f am-
plifier output frequency.
69C 868008-D
CRYSTAL
TRIPLER
OSCILLATOR MODULATOR | {ST 7056 7054 OR 8077 8032
7056 1/2 7060 DOUBLER (30w & SOW) (30W & SOW) (30w & SOW)
| 172 7060 7167 (400W) 7551 (100w) 5894 (400W)
DOUBLER- DRIVER POWER AMPLIFIER
DIAGRAM NO. 69C868008
DUAL SQUELCH
"PRIVATE -LINE”
MODELS ONLY
leumeetEREQ: ote | =
| | :
| CRYSTAL | E
OSCILLATOR l LEEPER PRIVATE -LINE |
| 7056 8 TONE OSCILLATOR] je—
| | 1.D.C.
|
! | (LOCATED ON POWER |
| | | SUPPLY CHASSIS) |
Lo __ < LEGEND:
4 AUDIO INPUT a
2 -FRE
Q
MODELS ONLY
Figure
fo = OSCILLATOR FREQUENCY = 2.083 MC — 4.500MC
fc = CARRIER FREQUENCY = 25-54MC
fc
42
12 fo
fo =
fe =
4,
Transmitter Block Diagram
The transmitter block diagram, figure 4,
shows the stage-by-stage signal flow and oper-
ating frequencies.
a. Tone Generator In Dual Squelch Models
The tone generator consists essentially of a
transistorized oscillator, a Motorola ''Vibrasen-
der" resonant reed, a squelch tail eliminator re-
lay and filtering networks.
The frequency of the oscillator is the ''Private-
Line" tone, controlled by the "Vibrasender" re-
sonant reed. The resonant reed is the mechani-
cal equivalent of a parallel-tuned LC circuit.
Oscillation begins when the radio set is
turned on. The tone output is connected through
relay contacts to the transmitter modulator. The
tone modulates the transmitter andis superim-
posed on the r-f carrier for the duration of each
transmission.
Two 180° out-of-phase outputs are available
as determined by the position of the relay con-
tacts. When the relay is de-energized, an ap-
proximate 180° out-of-phase tone is transmitted
to the ''Listening" receiver. The phase reversal
occurs at the center-tapped transformer, where
the switched outputs are about 180° out-of-phase
with each other. The out-of-phase tone quickly
damps the vibrations of the ''Vibrasponder" re-
sonant reed in the receiver and turns off the
receiver audio before the transmitter goes off the
air. The slow-release relay in the power supply,
provides the delay between the time the squelch
tail eliminator relay releases and the time the
transmitter goes off the air. This switching of
tone outputs eliminates the short burst of FM noise
which would otherwise be heard in the receiver at
the end of each transmission. Cause of the short
noise burst is this: Receivers inthe ''Private-Line"
system have a Motorola ''Vibrasponder" resonant
reed (at the same frequency as the transmitter
"Vibrasender'" resonant reed) in the squelch circuit.
The ''Vibrasponder"' resonant reed vibrates in re-
sponse tothe transmitter ''Private - Line'' tone signal
and the message is heard. Due to its high Q, the
"Vibrasponder''resonant reed continues to vibrate
for afinite time after the transmitted signal ceases.
During this time the receiver is unsquelched and
there is notransmitter carrier to provide receiver
quieting. A burst of FM noise, called ''squelch
tail'' would be heard at this time if the squelch
tail eliminator was not used.
b. Microphone and Pre-amplifier Circuit
A Motorola dynamic microphone with a
built-in transistorized pre-amplifier is usually
used with this transmitter. The microphone is
connected into the radio set control head; the
circuit from the control head is connected to the
transmitter. The microphone connects between
15
ground and the shielded lead of the audio ampli-
fier input circuit. A d-c voltage on the shielded
lead provides operating power for the transistor-
ized microphone. The microphone cartridge and
pre-amplifier act like a variable voltage genera-
tor. The output voltage varies with the intensity
and frequency of the sound waves which strike the
diaphragm.
eX, Deviation Limiting Crreuit
In the incoming signal from the microphone,
the wavefront slope depends upon both amplitude
andfrequency. The overall effect of the devi-
ation limiting circuit is to place a barrier upon
the maximum wavefront slope which can pass
into the modulator.
The deviation limiting circuit consists of
components for pre-emphasizing (6 db/octave
characteristic), amplifying and limiting, and then
de-emphasizing the modulation signal. The am-
plifier stage clips both positive and negative peaks
when they exceed the pre-determined clipping
level. The audio wave passes through a low-pass
filter to the IDC ("Instantaneous Deviation Con-
trol") control. Except for slope limiting, the out-
put waveform of the deviation limiting circuit is
identical to the input waveform. The amplifier
and deviation limiting circuit limits deviation by
controlling the maximum slope of the signal wave-
front which reaches the modulator. This controls
transmitter maximum deviation, since the modu-
lator frequency shift is proportional to the slope
of the audio input.
d. Oscillator and Modulator
The crystal oscillator generates a specific
frequency in the 2.083 to 4.500 mc range. The
exact frequency depends upon the assigned i-f
carrier frequency as determined by the crystal.
One-frequency models. have one oscillator stage,
the cathode of which is grounded directly. Two-
frequency models have two oscillators. The
cathodes are grounded through decoupling net-
works, one ata time, by the F1-F2 switch on
the radio set control head. Only the grounded
stage is in use; the open stage is unused at the
time.
The oscillator and audio-IDC outputs are
applied to the phase modulator, so that deviation
varies with frequency and amplitude of the modu-
lating signal.
e. Multipliers and PA
The modulator output is applied to the
16
doubler where the signals are amplified and
doubled in frequency. They are further ampli-
fied and tripled in frequency in the tripler and
doubled once more in the doubler-driver. The
doubler-driver stage develops the required signal
power to drive the power amplifier to its rated
r-f power output. The signals reaching the final
amplifier have been multiplied 12 times from the
original frequency generated by the oscillator.
5. POWER SUPPLIES
a. #12 Volt Models
The power supply converts the low voltage
d-c input to the high voltage d-c required for
operation of the transmitter as follows:
First. Changing d-c into a-c---transistor
switching circuit.
Second. Stepping up the voltage of the a-c
---power transformer.
Third. Converting the high-voltage a-cinto
d-c---rectifier filter networks.
NOTE
These power supplies will operate from
a positive or negative ground 12 v d-c
source. Refer to the installation in-
structions for proper positioning of the
polarity plug.
(1 eet ransister Gwitching.Ci nous
When the transmit relay is energized, A+
is applied through a pi filter to the emitters of
all power transistors. The input voltage is across
these banks of transistors and their associated
half of the transformer primary winding to A-.
The transistor switching circuit oscillator
consists of two parallel transistor banks. The
bases of each bank of transistors are connected
to the feedback bias circuit. One bank of tran-
sistors always conducts more than the other bank
when the input voltage is first applied. The po-
larity of the voltage induced in the feedback wind-
ing is such that the bank of transistors which be-
gins to conduct more than the other bank is quick-
ly driven to full conduction. The other bank is
quickly cut off. Current flows through the con-
ducting bank of transistors and their associated
half of the transformer primary winding until the
transformer core is saturated, at which time the
voltage induced in the feedback winding reverses
in polarity. The cut-off bank of transistors is
quickly driven to conduction through its associated
half of the transformer primary winding; the
first conducting bank of transistors is quick-
ly driven to cut-off. Conduction continues until
the transformer core is saturated again. Then
the cycle is reversed and repeated. This causes
current to flow alternately in opposite directions
through the two half-windings oftheprimary. The
circuit is designed for continuous, self-sustaining
oscillation as long as the d-cinputisapplied. The
switching action is very rapid and the induced
voltages approximate an ideal ''square wave".
The secondary windings of the transformer
provide the various voltages required for oper-
ation of the transmitter.
(2) Functions of Components
(a) Starting Circuit
The starting circuit consists of two re-
sistors anda capacitor. A small amount of for-
ward bias is applied to both banks of transistors
by the capacitor. This forward bias starts the
transistor conduction. Since there is never equal
conduction in all transistors, one bank will con-
duct more than the other. The heavier conduct-
ing bank is driven to saturation and the other bank
is quickly driven to cut-off.
(b) Feedback Circuit
The feedback circuit consists of the
transformer feedback winding, a resistor and the
base to emitter junction of the transistors. This
circuit is a closed loop within the oscillator. The
resistor determines the amount of drive current
fed back from the bases of the transistors. It
also determines the maximum power which can
be drawnfrom the secondaries of the transformer.
Bie et srt ec Eee coh
The transmitter B+ rectifier-filter net-
work converts the high-voltage a-c induced in the
transformer secondary to the ripple free d-c
output required for the transmitter. The net-
work consists of two full-wave bridge rectifiers
and filtering circuits.
Transmitter B+ is supplied from the out-
put of the bridge rectifier. The high-voltagea-c
is connected to opposite corners of the bridge
circuit. The filter network smooths out the volt-
age ripple. The output of this section is routedto
the transmitter through a set of contacts of the
transmit relay when it is energized.
Transmitter high B++ is supplied from
the output of a bridge rectifier which is added to
(placed in series with) the output of another
bridge rectifier. The high B++ output is routed
directly to the transmitter.
The transmitter bias network includes a
low-voltage secondary of the transformer, a rec-
tifier anda filter network. The negative bias
voltage is applied to the transmitter driver and
power amplifier grid circuits.
Microphone voltage is taken from a volt-
age divider in the transmitter B+ circuit.
b. +6/12 Volt Models
In 12 volt operation, the power supply con-
verts the low voltage d-c input to the high voltage
d-c required for operation of the transmitter.
Transmitter filament, receiver operating, and
crystal oven voltages are supplied directly from
the battery through the voltage and polarity plugs.
The power supply does not operate until the radio
set is in the transmit condition.
In 6 volt operation the power supply adds
(places in series with) an additional voltage to the
battery voltage to supply transmitter filament,
receiver operating, and crystal oven voltages in
addition to providing the high d-c voltages neces-
sary for operation of the transmitter.
Conversion of the low voltage d-c input to the
high d-c output for operation of the transmitter is
accomplished as follows:
First. Changing d-c into a-c---transistor
switching circuit.
Second,
Stepping up the a-c voltage---power
transformer.
Third. Converting the high voltage a-c into
d-c---rectifier and filter networks.
(1) Transistor Switching Circuit
(a) 6 Volt Operation
Two 6-volt switching circuits (os-
cillators), consisting of four transistors each, are
connected in parallel. A+ is applied to the
emitters of all power transistors. A- is applied
to the center taps of each of the primary windings
and through each half of these windings to the col-
lectors of an associated pair of transistors.
17
Proper polarity and voltage is maintained by
routing through the voltage and polarity plugs.
The base elements of each pair of
transistors are connected to the feedback winding
associated with each bank of transistors. All of
the transistors begin to conduct as A+ is
applied. One pair of transistors in each bank
will conduct more than its associated pair
due to difference in beta and leakage. As this
occurs, a voltage is induced in the associated
feedback winding. The polarity of this voltage
is such that the pair of heavier conducting tran-
sistors in each bank will quickly be driven to full
conduction. The remaining pair in each bank is
quickly cut off.
Current flows through the conducting
pairs of transistors in eachbankandthe associat-
ed half of each primary winding until the trans-
former core becomes saturated. At this time the
loop gain of the oscillator is reduced to less than
unity and the energy stored in the field of the
power transformer collapses, inducing a voltage
of opposite polarity across the windings.
The cut off pairs of transistors in
each bank are quickly driven to conduction through
associated halves of the primary windings. The
first conducting pairs in each bank are quickly
cut off. Conduction through the second pair in
each bank continues until the transformer core is
saturated again. The second pair is then cut off
and the cycle repeats.
Current flows alternately and inop-
posite directions through one half and then the
other of each primary winding. The oscillations
are self sustaining as long as the d-c input is
applied. The switching action is very rapid and
with the aid of wave shaping components the in-
duced voltage approximates the ideal ''square
wave"' pattern.
(b) 12 Volt Operation
In 12-volt operation, the two 6-volt
switching circuits are connected in series.
Switching action begins oscillation when the
push-to-talk button on the microphone is pressed
applying A+ voltage to the emitters of the trans-
mitters through a pair of contacts closed by
operation of the transmit-receive relay K201.
The switching action is similar to that in 6 volt
operation with the exception that current flow in
each circuit is through two parallel pairs of tran-
sistors in series with one half of each of the
primary windings.
18
(2) Functions of Components
(a) Starting Circuits
Starting of the switching action in 6
volt standby operation is accomplished by a volt-
age divider in the base circuit in each bank of
transistors. This applies a small amount of
forward bias to the base elements of the transis-
tors, which start conducting and initiate the
switching action.
In 12 volt operation the power supply
does not operate until the push-to-talk button is
pressed (transmit condition). Starting action is
similar to the 6 volt condition with the exception
that forward bias is applied to the bases of the
transistors by the charging of capacitors in the
base circuit.
(b) Feedback Circuits
The feedback circuits consist of the
transformer feedback windings, resistors con-
nected between the emitters and the center tap of
the feedback windings, and the base to emitter
junction of the transistors. The resistors deter-
mine the amount of drive current fed back to the
base elements of the transistors and also the
maximum power which can be drawn from the
secondaries of the transformer. Additional re-
sistors are paralleled in 6-volt operation to pro-
vide the necessary drive current.
(3) Rectifier and Filter Networks
(a) Transmitter B+
The transmitter B+ rectifier-filter
network converts the high voltage a-c induced in
the transformer secondary to the ripple free d-c
output required for the transmitter. Thenetwork
consists of a full-wave bridge rectifier and fil-
tering circuit. The complete winding connects
high voltage a-c to opposite corners of the bridge
circuit in 6 volt operation. A tap on the winding
provides a connection for 12 volt operation. The
filter network smooths out the ripple in voltage
and current. The output of this section is routed
to the transmitter through a set of contacts on the
transmit-receive relay when the relay is energized.
(b) Transmitter B++
Transmitter high B++ is supplied
from the output of another high voltage winding
and the bridge rectifier, which is added to (placed
in series with) the output of the B+ bridge rectifier
which supplies B+. The high B++ is filtered and
routed directly to the transmitter. A tap on the
winding is used for 12 volt operation.
CAUTION
In 6 volt standby operation, the power
supply is operating and a voltage is
presentatthe transmitter power amplifier
and driver tube plates.
(c) Transmitter Bias
The transmitter bias network in-
cludes alow-voltage secondary of the transformer,
a rectifier, anda filter network. The negative
bias voltage is applied to the transmitter power
amplifier grid circuit.
(d) Receiver, Crystal Ovens and Trans-
mitter Filaments
Two full-wave diode rectifier cir-
cuits are connected to low-voltage secondaries of
the transformer to provide d-c operating voltages
for the receiver crystal ovens and the transmit-
ter filaments in 6 volt operation. The filtered
output is added to (placed in series with) the d-c
input through the voltage and polarity plugs.
Microphone voltageis takenfrom the
voltage divider in the transmitter B+ circuit.
(4) Reverse Polarity and Improper Voltage
The radio set is protected against ac-
cidental application of reverse polarity input volt-
ages. If a reverse polarity input is applied in the
6-volt standby, 6-volt transmit or 12-volt trans-
mit conditions, a high current will flow through
the diodes connected between the associated pri-
mary and feedback winding center taps. Thefuses
in the feedback center tap lead will open. This
removes the bias from the transistors and re-
duces current throughthem to a safelevel. In the
6-volt conditions, both fuses will open. In the
12-volt condition, only one fuse will open. The
remaining fuse should be replaced due to possible
fatigue. In the 12-volt standby condition, a high
current will flow through a diode in the receiver,
opening a fuse in the power supply---thereby
protecting the receiver.
Fuses inthe cable kits provide pro-
tection against accidental application of 12-volts
when the unit has been arranged for 6-volt opera-
tion.
19
SERVICE AIDS
Complete removal of the printed circuit
boards for access to components is not always
necessary. The audio board may be folded out
after removal of the mounting screws.
NOTE
In 'Extender'' models it is necessary to
remove the mounting screws and fold out
the ''Extender'' board before folding out
the audio board (Figure 5.).
Components onthe transmitter/exciter board
are accessible as mounted. The relay and capa
citor deck folds out of the power supply. The re
mainder of the printed circuit boards in the re-
ceiver may be partially disconnected and folded out.
AUDIO BOARD
“EXTENDER”
BOARD
Figure 5.
The following steps outline procedures to
prepare various parts of the radio set for serv-
icing. Observe standard servicing practices
such as tagging of leads and identification of con-
necting points. Refertothe SERVICE DIAGRAMS
booklet for lead identification and routing.
NOTE
The letters and numbers that appear in
the boxes near the photographs, indi-
cate corresponding steps in the follow-
ing paragraphs. Example: a.(1) in
Figure 6 indicates the location of items
discussed in sub-paragraph ''a.(1)"'.
1. RECEIVER
a. 5.5 MC Board (Figure 6)
(1) Unsolder leads to r-f deck and oscillator
coupling capacitor.
(2) Unsolder filter lead.
Figure 6.
20
AEPD-6387-O(CE2171B)
AEPD- 6388-O(CE2171A)
AEPD-5313-A (MC6017)
(3) Unsolder filter A- lead.
(4) Remove four mounting screws and fold
out board.
b. Ist Oscillator Board (Figure 6)
(1) Unsolder coupling capacitor to 5.5 mc
board (yel slv).
(2) Unsolder A- lead to 5.5mc board (gray).
(3) Remove crystal and six mounting screws.
(4) Fold out board.
c. 2nd Oscillator Board (Figure 6)
(1) Unsolder injection lead to 5.5 mc board
(yel).
(2) Unsolder A+ lead to 5.5 mc board (brn
red).
(3) Unsolder A- lead (gray).
(4) Unsolder ground leads.
(5) Remove mounting screw and fold out
board.
d. 455 KC Board (Figure 6)
(1) Unsolder discriminator lead (grn wht)
and meter leads (wht grn and wht yel).
_ a.tita) cate :
(2) Unsolder the two filter leads.
(3) Unsolder ground lead (bare).
(4) Remove four mounting screws and fold
out board.
2. TRANSMITTER (30-50 WATTS)
a. Doubler Driver and Power Amplifier Tubes
(Figure 7)
(1) Doubler Driver
(a) Loosen four captive screws and re-
move rear heat sink.
(b) Remove tube.
(2) Power Amplifier
(a) Loosen four captive screws and re-
move rear heat sink.
(b) Remove plate cap connector.
(c) Release hold down spring and re-
move tube.
b. Access to Bottom of Exciter Board
(Figure 8)
Loosenthree screws and slide exciter bottom
cover out in direction of power supply.
a({)(a)af2)(a)
Figure 7.
21
a
[c(3)]a(4)] (4) £4)
ESCO)
Figure 8.
c. Access to Bottom of Power Amplifier Section
(Figure 8)
(1) Remove antenna output lead from har-
monic filter.
(2) Remove two screws in power amplifier
cover near power supply.
(3) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
d. Removal of Harmonic Filter or Access to
Resistor Board and Metering Socket
(Figures 8 & 9)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.:
(2) Remove antenna output lead from har-
monic filter.
(3) Remove two screws in power amplifier
cover near power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) Remove lead to output coupling coilfrom
filter.
22
(6) Remove filter mounting screw from op-
posite side and drop out filter. (Figure 9).
e. Removal of Power Amplifier Deck
(Figures 8 & 9)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.
(2) Remove antenna output lead from
harmonic filter.
(3) Remove two screws in power amplifier
cover néar power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) Remove lead to output coupling coilfrom
filter.
(6) Remove mounting screw from opposite
side and drop out filter.
(7) Unsolder blu-red lead.
(8) Remove plate cap connector.
(9) Remove four mounting screws and lift
out deck.
AEPD-5314-A (MC6020)
AEPD-5315-A (MC6023)
Figure 9.
f. Removal of Resistor Board and Hi-Lo Switch
(Figures 8 & 9)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.
(2) Remove antenna output lead from har-
monic filter.
(3) Remove two screws in power amplifier
cover near power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) Remove lead to output coupling coil from
filter.
(6) Remove mounting screw from opposite
side and drop out filter.
(7) Unsolder blu-red and red-wht leads.
(8) Unsolder red-wht lead.
(9) Unsolder orange lead.
(10) Unsolder red-blu lead.
(11) Remove two mounting screws (Hi-Lo
switch) and remove resistor board and switch.
3. TRANSMITTER (100 WATTS)
a. Doubler Driver and Power Amplifier Tubes
(Figure 10)
(1) Doubler Driver
(a) Loosen four captive screws and re-
move rear heat sink.
(b) Remove tubes.
MEY ONS Es
(a) Loosen four captive screws and re-
move rear heat sink.
(b) Remove two nuts, loosen two set
screws in heat dissipating plate connector and
remove connectors. An Allen wrench (Part
No. 66A106513) is clipped to the transmitter
for removing the nuts.
(c) Rotate heat dissipating shield to
clear springs from support bracket.
(d) Depress hold down clip and remove
tube with shield in place.
b. Access to Bottom of Exciter Board
(Figure 11)
Loosen three screws and slide exciter
bottom cover out in direction of power supply.
23
bfa.(4)}e.(4)]f. (4)
ay
Ld
a
Se oe
id
e.(2)]a.(3)]e.(3)]4.(3)]
fe.(7) £7] .t0)].c9)]t.40)
Figureclie
c. Accessto Bottom of Power Amplifier Section
(Figure (11)
(1) Remove antenna output lead from har-
monic filter.
(2) Remove two screws in power amplifier
cover near power supply.
(3) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
24
d. Removal of Harmonic Filter or Access to
Resistor Board and Metering Socket
(Figures 11 & 12)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.
(2) Remove antenna output lead from har-
monic filter.
AEPD-5316-B (MC6026)
AEPD-5317-B (MC6019)
AEPD-5318-A(MC6021)
(3) Remove two screws in power amplifier
cover near power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) Remove lead to output coupling coil from
filter.
\ SS ee
NX
(6) Remove mounting screw from opposite
side and drop out filter.
£% Removal of Resistor Board and Hi-Lo
Switch (Figures 11 & 12)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.
(2) Remove antenna output lead from har-
monic filter.
Figure 12,
e. Removal of Power Amplifier Deck
(Figures 11 & 12)
(1) Loosen three screws and slide exciter
bottom cover out in direction of power supply.
(2) Remove antenna output lead from har-
monic filter.
(3) Remove two screws in power amplifier
cover near power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) Remove lead to output coupling coilfrom
filter.
(6) Remove mounting screw from opposite
side and drop out filter.
(7) Unsolder center lead of shielded wire.
(8) Remove screw and lead to plate connec-
tor on power amplifier tube.
(9) Remove four mounting screws and lift
out deck.
(3) Remove two screws in power amplifier
cover near power supply.
(4) Loosen two screws near rear heat sink
and slide cover out in direction of power supply.
(5) .Remove lead to output coupling coil
from filter.
(6) Remove mounting screw from opposite
side and drop out filter.
(7) Unsolder red-wht and red-yel leads.
(8) Unsolder red-wht lead.
(9) Unsolder orange lead.
(10) Unsolder red-blu lead.
(11) Remove two mounting screws (Hi-Lo
switch) and remove resistor board and switch.
4. TONE OSCILLATOR DISASSEMBLY (Dual
Squelch Models)
- Loosentwo screws until tone oscillator
can be liftedfrom its mounting location
(Figure 13).
STEP A.
25
peg Ma IM aS)
26
- Lift
out tone oscillator and fold STEP C. - Remove printed circuit board mounting
back (Figure 14). screw and fold board away from chassis
(Figures 14 & 15).
STEP A
Figure 13.
Figure 14.
Figure 15.
AEPD-6393-A (MC6761)
AEPD-6394-O (MC6762)
AEPD-6395-O (MC6763)
5. DUAL SQUELCH “PRIVATE-LINE”’
MAINTENANCE
a. Operation
(1) "Vibrasender!! Resonant Reed
The ''Vibrasender" resonant reed is the
frequency-determining element of the tone oscil-
lator for the transmitter. It maintains the oscil-
lator frequency accurate within +0. 15% ofthe re-
quired frequency. The oscillator generates the
"Private-Line'' tone which is connected to the
transmitter modulator through an isolation re-
sistor. The output level of the oscillator is
stable and fixed to hold the tone deviation of the
transmitted carrier between 1/2 and 1 kc through
normal variations of input voltage, temperature,
transistor characteristics, component values
and modulator sensitivity.
The reed is a precision built device. It
consists of a tuned cantilever reed of special steel
mounted on a rugged base with a coil and two
permanent magnets. The entire assembly is
spring-mounted and hermetically sealed in a
metal housing to insure long life at peak perform-
ance under all types of conditions.
The tone oscillator is designed for con-
tinuous operation. No adjustments are required.
The design of the ''Vibrasender'' resonant reed
eliminates the need for servicing throughout its
useful life.
(2) lVibrasponder'' Resonant Reed
The ''Vibrasponder'' resonant reed
serves as the frequency sensitive switching de-
vice in the receiver ''Private- Line" squelch cir-
Cults
The tone-actuated squelchcircuit begins
with a low-pass audio amplifier which receives
its input directly from the discriminator. The
output of the amplifier is coupled to a driver
stage and then to the coil of the resonant reed.
When the detected tone signal applied to the reed
is the same as its resonant frequency, the reed
vibrates and its contacts close the bias circuit
to the audio squelch amplifier.
The circuit clasure is actually inter-
mittent since the contacts are closedonly when
the vibrating reed is at the extreme ends of its
travel. However, a capacitor in the bias circuit
maintains its charge during the open interval.
This makes the circuit effectively complete
throughout the vibration period of the reed.
The circuit supplies cut-off bias to the
audio squelch amplifier. When the squelch am-
plifier is cut off, the audio amplifier operates to
convey audio information to the speaker. In the
absence of the proper tone signal, the squelch
amplifier operates to cut off the audio amplifier
and open the audio path to the speaker.
The basic design and construction of the
"Vibrasponder'' resonant reed is similar to that
previously described for the ''Vibrasender"' reso-
nant reed. A set of contacts provides the circuit
closure required for squelchoperation. The sen-
sitivity of the resonant reed is factory adjusted
to give optimum performance for several years
of continuous duty in the average system. The
design of the ''Vibrasponder"' resonant reed eli-
minates the need for servicing throughout its
useful life.
b. Servicing
There are no special adjustments involved.
Servicing is a matter of detecting and replacing
defective components.
It is recommended that the serviceman keep
a record of the test performed, voltage readings
and other pertinent servicing data, each time
the equipment is serviced. This will serve asa
guide to normal operating conditions of individual
units.
(a) Motorola Model S1051B, S1051BR,
S1053A or S1053AR Transistorized AC Voltmeter
(b) Motorola Model S1052B or S1063A
DC Multimeter
(c) Motorola Model T1014A Precision
Wide Band Oscilloscope or Motorola Model T1015A
General Purpose Oscilloscope
Locate and check the A+ and A- voltages
for the tone oscillator circuit by referring to the
appropriate schematic diagram. Adverse effects
on oscillator performance can occur if the meas-
ured voltage is not up to the level indicated on
the diagram.
Measure the driving voltage on the coil
of the ''Vibrasponder"' resonant reed by connect-
ing the a-c voltmeter across terminals A-A at
27
the reed base. Make the measurement under the
following conditions.
(a) Received carrier is modulated with
correct ''Private- Line" tone,
(b) Absence of voice modulation.
(c) Receiver A+ and A- voltages at pro-
per level.
Under the previous conditions the driv-
ing voltage should be above 2.5 v a-c. This
reading will vary if the receiver voltages (A+ &
A-) are above or below normal.
If the receiver voltages are correct and
the driving voltage is below 2.5 v a-c, check
voltages and resistances in the tone oscillator
circuit to locate the defective component. If no
defective components are located, replace the
"Vibrasponder'' resonant reed.
NOTE
Transistors are highly dependable com-
ponents and do not normally require re-
placement.
(4) Transmitter Tone Deviation
The IDC (''Instantaneous Deviation Con-
trol'') Adjustment Procedure included in this
manual may be used to determine proper oper-
ation of the tone oscillator in the transmitter.
Refer to this procedure for detailed information
concerning measurement of ''Private-Line'' tone
deviation. If this procedure indicates insuffi-
cient (or lack of) tone deviation and the transmit-
ter modulates normally with an audioinput, check.
the tone oscillator circuit for incorrect voltages
or resistances to locate the defective component.
NOTE
Transistors are highly dependable com-
ponents and do not normally require re-
placement.
If all voltage and resistance readings
are correct, replace the "Vibrasponder" resonant
feed:
28
(5) Symptoms, Causes and Remedies
is not recommended.
Cause:
Remedy:
Mobile receiver audio
signal spasmodic or in-
termittent.
Defective tone contacts
on squelch tail elimi-
nator relay in transmit-
ting station.
(1) Replace defective
relay.
(2) Check transmitting
station tone deviation.
CAUTION
Cleaning or adjustment of relay contacts
This should only
be attempted as an emergency procedure.
(b)
(c)
(d)
Symptom:
Cause:
Remedy:
Symptom:
Cause:
Remedy:
Symptom:
Cause:
Remedy:
One mobile radio set
(normal r-f power out-
put) has difficulty con-
tacting a station while
others do not.
Insufficient (or lack of)
tone deviation in mobile
transmitter.
Check transmitter tone
deviation as previously
described and replace
defective component.
All units in network have
difficulty contacting a
particular unit.
Defective receiver in
particular unit.
Check tone amplifier
and "Vibrasponder" re-
sonant reed in defective
receiver as previously
described.
Units hear squelch tail
noises from particular
unit but not from all units.
Defective squelch tail
eliminator relay in par-
ticular unit.
Replace defective relay.
SEE PREVIOUS CAU-
TION.
6. ACCESSORY CONVERSION INSTRUCTIONS
a. General
The following instructions are for converting
+6 volt ''Motrac''! radio set accessories for +12
volt operation.
The conversion requires modifying the +6 volt
control head to operate from a +12 volt electrical
system. On trunk mount radio sets, the cable kit
must also be modified. These modifications
enable the accessory items to be transferred
fromavehicle with a +6 volt electrical system to
a vehicle with a +12 volt electrical system. How-
ever, be sure the polarity reversing plug and volt-
age plug on the radio sets are in the proper
positions.
b. Conversion Instructions
The following tables list the various control
heads and cable kits that can be converted. The
modifications required to convert a control head
or cable kit are indicated by numbers in the
MODIFICATION PROCEDURE NO. column of each
chart. These numbers pertain to the procedures
that follow these charts.
DASH MOUNT CONTROL HEADS
CONTROL HEAD
MODEL NO.
TCN6027AE
TCN6027AF
TCN6027AG
TCN6027AH
TCN6027AE-1
TCN6027AF -1
TCN6027AG-1
TCN6027AH-1
*TCN6047AE
hy
DRARBDARDAAIKDAAGD i
*TCN6047AF
*TCN6047AG 12
*TCN6047AH 12
*"'Extender'! control heads
VOLTAGE
CONVERSION RADIO SET APPLICATION
WZ;
12
WZ
4
12
2
2:
12
eZ,
12
MODIFICATION.
PROCEDURE NO.
Carrier 132535459
Carrier
Dual
Dual
Carrier 1935-45.5.5.6
Carrier
Dual
Dual
Carrier
Carrier
Dual
Dual
TRUNK MOUNT CONTROL HEADS
CONTROL HEAD
MODEL NO. m Aye)
i
KR
ie)
VOLTAGE
CONVERSION RADIO SET APPLICATION
FREQ. | SQUELCH OPERATION
MODIFICATION
PROCEDURE NO.
TCN6030AE
TCN6030AF
TCN6030AG
TCN6030AH
TCN6030AE-1
TCN6030AF-1
TCN6030AG-1
TCN6030AH-1
*TCN6045AE
*TCN6045AF
*T CN6045AG
*TCN6045AH
*TCN6045AE-1
*TCN6045AF-1
*TCN6045AG-1
*TCN6045AH-1
O~ GO OD DID DW OD DID D DW OID DW D
ee ee
NNMN NIN NN NIN WY NIN LW WNW LN
*"'Fixtender'' control heads
Carrier
Carrier
Dual
Dual
Carrier
Carrier
Dual
Dual
Carrier
Carrier
Dual
Dual
Carrier
Carrier
Dual
Dual
29
TRUNK INSTALLATION CABLE KITS
VOLTAGE
CABLE KIT
MODEL NO.
TKN6057A 12
TKN6057A-1 TZ
TKN6058A 12
TKN6058A-1 12
*TKN6096A 12
*TKN6097A 12
*'"'Kixtender'' cable kits
c. Modification Procedures
(Refer to the radio set schematic diagram)
(1) Replace the two 6 volt indicator lamps
with 12 volt lamps (Motorola Part No. 65R4151).
(2) Remove diode CR501 and make a straight
through circuit connection.
(3) Move the lead from pin 18 of receptacle
J502 to pin 4 of this receptacle.
(4) Replace fuse F501 witha5 ampnon slow-
blow fuse (Motorola Part No. 65R52293).
(5) Replace fuse F502 with a 15 amp non
slow-blow fuse (Motorola Part No. 65R4165 fuse
and 43A831204 fuse holder adapter).
(6) Move the ORG control head cable attached
to the exterior fuse block, to the accessory or
"on" position of the ignition switch. Leave the
TRANS-FILAMENT switch in the ON position
after conversion, since the transmitter filaments
will be controlled by the ignition switch.
30 Zz
CONVERSION RADIO SET APPLICATION
MODIFICATION
FREQ. | SQUELCH OPERATION PROCEDURE NO.
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
(7) Remove the BLK jumper connected across
resistors R501 and R502.
(8) Transpose the leads connected to pins 4
and 18 of receptacle J502.
(9) Replace fuse F403 with a 5 amp non
slow-blow fuse (Motorola Part No. 65R52293).
(10) Replace fuse F401 with a 15’ amp non
slow-blow fuse (Motorola Part No. 65R4165 fuse
and 43A831204 fuse holder adapter).
(11) Replace fuse F402 with a 6-1/4 ampnon
slow-blow fuse (Motorola Part No. 65B475247).
(12) Remove plug P502 from the RED external
control head lead. Connect this lead internally to
pin 4 (for negative ground installations), or pin 17
(for positive ground installations) of receptacle
J502.
(13) Move leadfrom pin 32 of terminal board
TB501to pin 4(for negative ground installations),
or pin 17 (for positive ground installations) on
terminal board TB501.
(14) Remove external control head lead W408.
P/O TB4
Be aa F2
a og - YEL-BLU ~
jones DRIVER OUTPUT euirenei nce Ae es
455KC iA Qi8 (020) pF RE OonEy 44 FA YEL- BRN
M4 NOTE 6 J402-7
m4so¢ M4343 aaa 608
C344 + BLU TO RECEIVER e
: R29 4 not pecenl oe XTAL. HEATER athe hs
RUF 3.3K . ‘ T302 .O6 8UF T303
BLK BLK-YEL
J402-5
©)
4.
27 15K 1C54 8) | a a20 |° METER
=. P 7 : ie) () RECEPTACLE |
an OE. bee , C3458 I>
18K R327 R33 (O68UF < BRN ua
J402-3
12K 8
ing 1/2W { > EN __y. 455KC AMPL.-1
a j “38334. pen-etu—| |+reo 2 455KC AMPL-3
Ou4 aie, ee §
i UF +2 ee +4 4 > WAT NEC ig oe DISCR. SECONDARY
, -2 at ae By 5 WHTcBru Te DISCR: PRIMARY
3 =-3 - : 6 > {ST OSCILLATOR
4 >—— o
zane 7> = DETAIL
{2>,
MODEL TABLE ©
TRANSMITTERS
MODEL NO.OF | FREQ.
RECEIVERS
NO.OF
FREQ.
CHANNEL FREQ.
SPACING RANGE |-
P/O TBI ia
[TRDIZ2IAA| | TTOI251AA | 2 |
PN BRN-RED OAA[TRDIZ22AA| 60KC [150.8-462MC| | TTDI2SOAA |TTDI252AA —= 140-150.8MC
() : TRDI323AA 162-174 MC TTD1I253AA 150.8-162MC
G327 TRDI324 AB a i36-150.8mc] | [TTOI250aB[ 2 [2 ([150.8-174 MC |
note | (2) oaB[TROIB22AB |__| 30KC [150.8-162MC
62-174MC
a
°
ey
=
a
rs)
=
ts)
50,8-462MC
==
w
o
By
a
°
@
=
fs)
CONTROL HEAD
MODEL NO.OF | TYPE OF
TCN6O25AE [| |= 4_——« | DASH-MOUNT
TCN6025AF 2 [ DASH-MOUNT
TCN6026AE TRUNK MOUNT
TRUNK MOUNT
== 3 TRD1I323AB
TRDIZ24AC 36-450.8M
OAC{TRDIZ22AC[ 60KC ;
TRDI323AC — 162 -174MC
ee
ya TRDIZ21AD
GRAY
6a O
OTS
UF = 6) BRN- BLU
OAD |TRDI3Z22AD
Py Hall
A GRAY-GRN
a (0)
TRD1323AD
Ff POWER SUPPLY
MODEL NO.OF
NUMBER SUFFIX FREQ
TKN6055A
ITY DIODE TKN6056A “al TCN6026AF
OTE \4
DASH-MER SUPPLY
PREAMPLIFIER DETAIL 400VDC
B++
T201 {
WHT-BLK RED-GRN : L201
WHT
RED-BLU
“To.sur “Tosur
n | P/O
RED-YEL RED-WHT-BLU
Fela Ye
B+200VDC
TO TBIOI-4
R204
8K
5%, 3W
R214
crn CR209 R206 GRN-BLK BIAS (2 VOC
4041-'
MIC, DC
R209 TO THIOI-8
R205*+GRN-WHT
K404
ANTENNA DIAGRAM NO, 63E81011A54
RELAY DETAIL
= TO
ANTENNA
RECEIVER CONNECTOR
P201 DETAIL
MATING SIDE FROM
sie TRANSMITTER
ESSSSNSNS
136-174 MC, 25 W, +12 V Carrier Squelch
"Motrac" Radio Set
Ae ate RIB Schematic & Intercabling Diagram
SEA Motorola No. 63E81011A51-O
XS
TRUNK INSTALLATION CABLE KITS
CABLE KIT
MODEL NO.
TKN6057A r2
TKN6057A-1 12
TKN6058A 12
TKN6058A-1 i2
*TKN6096A 12
*TKN6097A 12
*'"'Kixtender'' cable kits
c. Modification Procedures
(Refer to the radio set schematic diagram)
(1) Replace the two 6 volt indicator lamps
with 12 volt lamps (Motorola Part No. 65R4151).
(2) Remove diode CR501 and make a straight
through circuit connection.
(3) Move the lead from pin 18 of receptacle
J502 to pin 4 of this receptacle.
(4) Replace fuse F501 witha5 ampnon slow-
blow fuse (Motorola Part No. 65R52293).
(5) Replace fuse F502 with a 15 amp non
slow-blow fuse (Motorola Part No. 65R4165 fuse
and 43A831204 fuse holder adapter).
(6) Movethe ORG control head cable attached
to the exterior fuse block, to the accessory or
"on'' position of the ignition switch. Leave the
TRANS-FILAMENT switch in the ON position
after conversion, since the transmitter filaments
will be controlled by the ignition switch.
30 $
VOLTAGE
CONVERSION RADIO SET APPLICATION
FREQ. | SQUELCH OPERATION
MODIFICATION
PROCEDURE NO.
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
Dual or Carrier
LOM a
LOeh, £4
(7) Remove the BLK jumper connectedacross
resistors R501 and R502.
(8) Transpose the leads connected to pins 4
and 18 of receptacle J502.
(9) Replace fuse F403 with a 5 amp non
slow-blow fuse (Motorola Part No. 65R52293).
(10) Replace fuse F401 with a 15 amp non
slow-blow fuse (Motorola Part No. 65R4165 fuse
and 43A831204 fuse holder adapter).
(11) Replace fuse F402 with a 6-1/4 ampnon
slow-blow fuse (Motorola Part No. 65B475247).
(12) Remove plug P502 from the RED external
control head lead. Connect this leadinternally to
pin 4(for negative ground installations), or pin 17
(for positive ground installations) of receptacle
Jo02.
(13) Move leadfrom pin 32 of terminal board
TB501to pin 4(for negative ground installations),
or pin 17 (for positive ground installations) on
terminal board TB501.
(14) Remove external control head lead W408.
¢ IMPORTANT
“or + ‘4 y ’ :
+1, +2, -1, -2 etc. ARE CIRCUIT TIE POINT INDENTIFICATION NUMBERS
! ; 3 AND DO NOT CORRESPOND TO VOLTAGE READINGS AT THESE POINTS,
Z4 455KC FILTER
455KC AMPL.
Q'
9
M9003
ua
ea
: -
4ST MIXER 8MC Tr AMPL: 2ND MIXER
. Qo cL GB M9024 M9023 , M4605
i é
; wz C18, 0.2
! lies
_— Comal '
: cri 30 Jez:
s
a 2
|
1 :
: F
|
1
\
|
—— |
l YEL |
4ST OSC. |
‘03 (F2) 4ST Osc MULTIPLIER | 2ND_OSC.
M4363-RED M4363 (i-FREO) we : ae
2 FREQ. MODELS ONLY = M4548-BLU M9003
142.8- 166 MC cue |
* cme c3ia cue a
ae |
_ 0.39 ot (oie We
tr]! EE) Ga ‘tz = 334
| c313 C315] ! C317 ‘ou
' sy fi. i, \f 4 -
j |
pa | ae = ne 42
302 iL
7
UH
cs
0.62
MH
455KC IF AMPL-1
HEATER
TRANSMITTER “a
Fi OSC. MODULATOR DOUBLER TRIPLER DOUBLER DRIVER POWER AMPLIFIER
ais ey eee 22.666 -29MC utO3 68-87MC vio4 436-174MC_—useo For ©= W105
ee ach (F2] note 3 Bose ise-Homc) 6032
190
| NOTE 2 cus. Java jes
Foe AS
| Cos] cizet = 4g RI42 RIBS 2000] jaw
400K
| 2006 ssurl—
+i = 4
| = 8+200V0C B+200v0C 8+200V0C 8+200V0C 8+200V0C
TRIOI-4 TBIOI-4 TBIOI-4 TBIOI-4 TRIOI-4
BIAS -I7VDC BIAS~I7V0C
TBIOI-6 Pets
, B++400V0C
nus7g lerst | AUDIO AMPLIFIER Tio4 LU 6H
Rt R
aan “Teo00 ; 0.94 REO Bix R132 433
= | MIC
1 154 AUDIO
= TBIO-410
'
TRANSMITTER FILAMENTS :
2 —* XM FIL
TE 3) Z A, FROM
vi0g << wolC woz W103
5 4
x 4402-10 |
L i POWER
vi0S ViOS SUPPLY
cas 2] |ciso 2} |crao XTAL
O2uF 250 250 HEATER
5 = = = TeiOI-8
B+200Vv0C
TBI0I-4 Te
TERMINAL
DETAIL
8+200V0C
TBIOI-4
8++400V0C
J404
METER
RECEPTACLE
B+200V
=(7V BIAS
FROM
POWER
SUPPLY
METER =
HOM
bay
455KC IF AMPL.-2
On
M4590
RECEIVER
455KC IF AMPL. 3
Qi2
M9003
DUPLICATION OF POWER INPUT CIRCUITRY IN
CONTROL HEAD, POWER SUPPLY & CABLING
P/O TBI
FROM
16 cower
BRN-BLU | FROM
P201-02
FROM
P201-c2
4
POLARITY DIODE
NEGATIVE GROUND SYSTEMS
L204
VEHICLE
BATTERY
©
NOTE
L204 & K20i LOCATED ON POWER SUPPLY
~ POSITIVE GROUND SYSTEMS |
SEE NOTE 1
DASH-MOUNT CABLING
AGOI
PREAMPLIFIER DETAIL
TO PEOI-2
REQUIRED IMPEDANCE
455KC IF 4ST LIMITER
Qi3
M4590
455KC IF 2ND LIMITER
O14
mSCO5 MODELS ONLY.
NOTES
FREQUENCY CALCULATIONS:
RECEIVERS;
fo +@mc
5
fois (136~-450-6MC)
fors£2= 8M (450,8-474MC)
TRANSMITTER; fo* ig
———— LIGHT WEIGHT DASHED CIRCUITRY
USED IN 2 FREQUENCY OPERATION ONLY.
SEE PARTS LIST FOR COMPONENT VALUES.
PART OF CONTROL HEAD CIRCUITRY IS DUPLICATED
IN RECEIVER SECTION,
$501 AND R506 ARE GANGED FOR ONE-FREQUENCY
OPERATION ONLY.
Q19 AND Q20 ARE LOCATED BEHIND FRONT PANEL.
ALL MEASUREMENTS MADE USING & MOTOROLA
MODEL S{052A DC MULTIMETER. RECEIVER
VOLTAGES TAKEN WITH REFERENCE 10 FILTERED
A-, WITHOUT AN INPUT SIGNAL AND 13.8 VOLTS AT
BATTERY TERMINAL
USQ= RECEIVER UNSQUELCHED.
FSQ= RECEIVER FULLY SQUELCHED.
TRANSMITTER VOLTAGES TAKEN WITH REFERENCE
TO CHASSIS GROUND, AND {3.6 VOLTS AT BATTERY
TERMINAL. READINGS MAY VARY+20%
USED IN SPLIT CHANNEL f .
DISCRIMINATOR
FROM
J40244
8. UNLESS OTHERWISE STATED, CAPACITOR VALUES
ARE IN MICROMICROFARADS
9 UNLESS OTHERWISE STATED, RESISTOR VALUES
ARE IN OHMS, 110%, 4/4 W, K=4000.
{0 00 NOT USE SLOW SLOW FUSE
{1 CR304 IS A REVERSE POLARITY PROTECTION DIODE
FOR RECEIVER AND I$ LOCATED UNDERNEATH TBI
{2 CR2{0 IS A REVERSE POLARITY PROTECTION DIODE
FOR POWER SUPPLY.
43. RECEIVER COMPONENT VALUES ENCLOSED IN OVALS
ARE WIDE-CHANNEL (6OKC) VALUES.
44.1N SPLIT-CHANNEL (30KC) RECEIVERS, C346 IS
CONNECTED DIRECTLY TO 024 BASE. WIDE-CHANNEL
(6OKC) RECEIVERS INCLUDE FILTERING COMPONENTS.
/MPORTANT
ALL CAPACITORS WHICH REQUIRE REPLACEMENT
MUST BE REPLACED WITH CAPACITORS HAVING
THE SAME TEMPERATURE COEFFICIENT AS THE
ORIGINALS, SUCH AS N470. REFER TO PARTS LIST
ON THE BACK OF THIS DIAGRAM.
TRUNK-MOUNT CABLING
WIRE NOT
SUPPLIED.
DUPLICATION OF CONTROL HEAD
CIRCUITRY AND INTERCABLING CONNECTIONS |
FROM J402-15
J502-11 OR
T50-" SOS
3502-1" OR
“NOTE 4 ]
|
4402-45,
40K
C337| O-2UF
O45
o uF
4502-45
OR TBSOI-(5
Ja02-14
CARRIER NOISE >
44 =2 a2
LIMITER DETECTOR
024)
M4573
AUDIO DRIVER
oO } (017} (O18)
M4573 | M4313
4,5¥ USO.
0.2V FSO.
OUTPUT
(019) (020)
M4608
R330
NOTE 6
SWITCHED A- (4 Se
44°
TO RECEIVER
XTAL HEATER
2 FREQ, ONLY
YEL-BLU
BLK-YEL
ae
MODEL TABLE
Jt
METER
RECEPTACLE
= YE
3
¢ >LWHT-BRN _.. 455KC AMPL.-1
TWHT-RED __
ay
—+ 455KC AMPL~3
>LWHT-YEL____4. piscr. SECONDARY
>LWETGEN __4. DISCR. PRIMARY
WHT-BLU __. 4ST OSCILLATOR
Jt
7™> = DETAIL
RECEIVERS
TRANSMITTERS
| SUFFIX
NO.OF
FREQ
CHANNEL
SPACING
FREQ.
RANGE
SERIES
MODEL
NUMBER
| NUMBER
NO. OF
FF
SUFFIX PREG
[ TROISZ4AA
TROIZZ0A4 |TROISZZAA
[TROIS23AA
60KC
| Tise-1506MC
TTOI2SIAA
140MC
TTDIZ53AA
140-150.8MC
150.8-162MC
~_[TROISZIAB
TROI3ZOAB | TROIS22AB
TROIS23AB
2
TTDIZ5OAA [TTDI252AA| 2 -
2
2
TTDIZ50AB |
2 [150.8-174MC |
3OKC
[TROI32IAC |
TRD{320AC |TROIS22AC
_[TRDIS323AC
60KC
136-450.8MC
i62-174MC
TROI321AD
a eee
TRDI3Z0AD [TROIS2ZAD
[TROI323A0
[36-150.8MC
150.8-(62MC
ie2- «74M
~_ CONTROL HEAD
POWER SUPPLY
CABLE KIT
MODEL
NUMBER _
NO.OF
T
| surr
| sed FREO
] TYPE OF
| INSTALLATION
MODEL T POWER
T
FFX
|_numger | SU ouTPuT |
MODEL
NUMBER
+
FFIX
su +
[Fensoesae |
DASH-MOUNT |
fTenioaal 4 25W
.
TKNEOSSA |
| DASH-MOUNT
TRUNK MOUNT]
TKN6OS6A |
[TON 6026AF
‘
2
TRUNK MOUNT]
POWER SUPPLY
IGNITION slay CHASSIS B ORCI
SWITCH GNO, VEHICLE GND RFINAST © sce na 400voc
“4 B+
04
TONTROL HEAD P402 J402 L204 an | J401 a ee “ L208 4
UNGNO. GND [i oy BRN-WHT = ‘ht @tocaten on CRZOIGY ygcR202 35MM
TERM TERM 7 ha 1S JOMH aL BRN-YEL $201 FRONT PANEL WHT Cok pBeD wet
— (— ee THIOL 10 eee es 4 FROM "gs
IGNITION ° si BCSHLOI 9: u BRN-WHT f BLK. J) NETTING Max EC XK cr206
SWITCH ¢ \ = RED | BRN-YEL as = | SWITCH ARMONIC WHT-BRN REO-BLU WW
CHASSIS 8 Vs = FILTER | =
F503 VEHICLE GND. | V prn-v BRN-YEL Fe |
2 a 4 o_BRNYEL, 151-5 = REO-YEL cR
im) | ‘ 6 es Mas |
1 I ' To XMTR, Teioi-1 \ gir x R201
Sra BLK-RED Faye teql_BRN XTAL-HTR y RED-BLU
(cOnG=t aa = 7 8+200v
‘ BLK-ORG 1 4 13 13q1 TEGAN, To siol-s RED CRO, Meo08 Sra reiors
‘ it —
ia Zs 4 — — — ~~ — - = $F) BLKC VEL “ ia |__ orc 44
24 WW ital ! |
il ro | C2048
BLK-BRN |__ GRN-REO TO AUDIO
'
RS0S,25K 33K,\/2W Le ail 3 eis ey +107 “Soaro 1508 GRAY can CR209 R206 GRN-BLK gias-«rvoc
2 i
< 28 | | tSHIELO | > T3 LEADS) * 1.2K TO TBtOI-6 MIC.OC
eck-crn |! isol_SN_. 49 =|c203 jw R209 TO TEIOI-8
re 1 iw R205¢GRN-WHT
184 +T3sur iw 15K
Hee GRAY F i 2R GAN = 2w
174 —1R => =
aay Ss 9 GL TEL BLU, T8)-3 ae BRN-BLU < C 3
ao ~~» TRi~ A K401
Sos Bh gol_sray Se [Ne ANTENNA DIAGRAM NO, 63EIONNASI
(6 E_VELRED, QTORWTR F2OSC | GRAY-GRN, 154-10 f 8) RELAY DETAIL
' K201
164 To
YELBLK RELAY DETAIL D
rEL-BLK_ 8 ot EE BE Ke Bro xmTR Fi osc = SONNECTOR
> TBI-4 CONN
1 YEU
3qi—tEt —+ 151-7 BAN-RED, 19, , =
i Pre a 201 DETAIL =
JUL -ORG* : ; (MATING SIDE) ae
¥ A
TBSO( DETAIL SERVES TBI-é ee GoRy
Lwaos
502 BP402 DETAIL
876549321
80000000
or
20
HMB S
O19 O18
eeee
(3141516
b
<i
Wreath crcuno ||@ @ ©)
SYSTEM 4g
OZe7e)
Gy "
Ie)
Hi} tHe 4
REO BREA VISIBLE .
POSITIVE GROUND oe
SYSTEM
POLARITY pS
CONNECTOR
DETAIL
136-174 MG, 25 W,
+12 V Carrier Squelch
"Motrac" Radio Set
Schematic & Intercabling Diagram
Motorola No.
63E81011A51-0
3 5-0 TMN6000A Dynamic Microphone
51 1V 861317
230844927
pr23C82601A03
59C 852603
28A16370
48A124317
6R6080
a0 6R5581
6R5621
6R5660
3 40C82202B01
1V80707A58
1V 864588
424852710
15K858486
13K858488
35A852701
32A852 702
14A857138
424852705
144857137
4K861625
1V 865398
NOTES:
REFERENCE MOTOROLA
Pe enna: DESCRIPTION
MICROPHONE
EPD-7864-O
AMPLIFIER, AF
mic pre-amp; assy incl
1V859594 BOARD, circuit;
ref parts C601, Q601, R601,
602, 603, 604
CAPACITOR, fixed:
20 uf +100-10%; 25 v
CARTRIDGE, microphone:
dyn type; 175 imp at 1 ke
CONNECTOR, plug:
male; 4 cont incl 41K838823
SPRING
TRANSISTOR, (SEE NOTE)
P-N-P; does not incl 144861196
INSULATOR, transistor
RESISTOR, fixed: 10%; 1/2 w
unl stated
4, 7K
3, 3K
10
180
SWITCH,
push: dpst; does not incl
38A852699 BUTTON, push
CORD, microphone:
incl 30K852742 CORE, coiled:
tinsel; 4 cond; 41A852707
SPRING; 294847033 LUG,
term. ; 4 req'd; 29A847034 LUG,
term. ; 4 req'd; ref part P601
NON-REFERENCED ITEMS
BACKHOUSING AND HANG-UP
STUD ASSY
STRAP, strain relief
HOUSING, front
GRILLE
CLOTH, grille
GASKET
INSULATOR
CLAMP, cartridge
INSULATOR, cartridge
WASHER
MOUNTING KIT, microphone:
incl 64485596 BRACKET
Replacement transistors and diodes must be ordered by
Motorola part number only for optimum performance.
PARTS LISTS FOR PRINTED CIRCUIT ASSEMBLIES ARE
ARE ON THE BACK OF THE CORRESPONDING
PRINTED CIRCUIT DIAGRAM,
MOTOROLA INC. COMMUNICATIONS DIVISION
SERVICE DIAGRAMS
MOTRAC
MOBIIE FM TWO-WAY RADIO
ISG-1742 MC 25 W RF POWER
“12 VOLT SYSTEMS
CARRIER SQUELCH MODELS
BA aie
yor! UABHHT-L000D U43HHT-1100D
. Me U43HHT=1910D _U43HHT-1110D
eee U43HHT-1040) U43HHT-1130D
PRINTED IN U.S.A. : . donating, f
Ce ae i of.
-¥ — es. es. — - ”~ “/™ = “a. ick —— > oe -
| REFERENCE | MOTOROLA REFERENCE MOTOROLA 3
DESCRIPTION DESGhinT REFERENCE | MOTOROLA
j [Sewmscc® | "ser | svmeoe | “rant ns a Svea | "ar no DescnipTioN mee [ners oeechierion pope ees pEscniPTion
TLN6342A & TLN6343A Metering Socket & Cable Kit EPD-7838-O
PARTS LIST éc- scnematic Magram 63E81011A51<0 TKN6055A & TKN6056A Cable Kit PD-7828-O CONTROL HEADS MICROPHONE
TRANSMITTER
RECEIVER
LEGEND
L = 136-150.8 mc
M = 150, 8-162 mc
H = 162-174 mc
TLD6261A RF Ampl. (136-150.8 mc)
TLD6262A RF Ampl. (150.8-162 mc)
TLD6263A RF Ampl. (162-174 mc)
21K840046
21B861219
21R410063
21D82610C23
21K857337
21C82187B11
48C82617C01
or48C 82617C03
9C87120
24B82890D02
24B82890D04
24B82890D06
24B82890D01
24B82890D03
24B82890D05
24B82890D07
24B82890D08
24B82890D09
24V80901A66
24V80901A67
24V80901A73
48R134521
6K128904
6K129231
6B127800
6K129432
NON-REFERENCED ITEMS
1V80721A80
64B82634D01
1V80721A84
26A82904D01
1V80721A82
EPD-7821-O
CAPACITOR, fixed: uuf; 500 v;
unl stated
100 +10%
1000 GMV
10 +0.5 uuf; NPO
6.8 20.5 uuf; NPO
7.5 20.5 uuf; NPO
1500 10%; 100 v
SEMICONDUCTOR DEVICE,
diode: (SEE NOTE)
silicon
CONNECTOR, recep:
female; single cont
COIL, RF
coded CB4
coded CB6
coded CB8
coded CB3
coded CB5
coded CB7
coded CB9; incl ref part CR1
coded CCl; incl ref part CR1
coded CC2; incl ref part CR1
coded CB]; incl ref parts C4L,
C6 and 76B82451B03 CORE,
tuning
coded CB2; incl ref parts C4M,
Cé6 and 76B82451B03 CORE,
tuning
coded CC3; incl ref parts C4H,
C6 and 76B82451B03 CORE,
tuning
TRANSISTOR, (SEE NOTE)
P-N-P; type M4521
RESISTOR, fixed; +10%; 1/4 w
HOUSING ASSY: incl ref part J:
COVER, housing
TOP PLATE AND TUNING
COLLAR ASSY.
SHIELD
AMPLIFIER PLATE AND
CAPACITOR ASSY. incl ref
parts C2, 3 and 5
9C857358
IF FILTER
TFN6013AS
orTFN6013AW
TLN6349A Chassis Kit
23K868713
48B865848
48R134608
25C 855092
1V80704A74
XQ19, 20 9B851303
TLN6479A Chassis Hdwe Kit
21D82428B06
CONNECTOR, receptacle:
female, 12 cont.
EPD-7827-O
FILTER, IF:
bandpass; 30 ke; incl
1V80721A77 455 ke Filter
Amplifier Board Assy.
(detail EPD-7699)
bandpass; 60 kc; incl
1V80721A77 455 ke Filter
Amplifier Board Assy.
(detail EPD-7699)
EPD-7823-0
CAPACITOR, fixed:
100 uf +100-10%; 25 v
SEMICONDUCTOR DEVICE,
diode: (SEE NOTE)
silicon
TRANSISTOR, (SEE NOTE)
P-N-P; type M4608
TRANSFORMER, AF:
pri: BLU, BRN; RED tap;
res 0.5
sec: GRN, BLK; res 0.2
BOARD, term:
10 solder lugs
SOCKET, transistor:
female; 2 cont
EPD-7824-O
CAPACITOR, fixed:
-01 uf +70-30%; 100 v
TLN6236A Xmtr. Chassis Kit (150. 8-174 MC)
TLN6315A Xmtr. Chassis Kit (136-140 MC)
Cl22 21B800801
C123, 149, 150 21K863801
C124 1V864703
21K800836
21R 122236
lor21K8407 12
21K835358
19K800032
21K868935
9C82201E01
24482112D0])
or24B82009C0]
24B855170
24K832590
24K861264
6R6048
6R 401017
686477
6R5718
6R5631
17K892469
40A11589
1V80704A74
V104, 105 97T116A02
XV 104, 105 90890001
TLD6080A & TLD6222A PA Deck
214824948
19K800032
19B838179
248855174
pr24B82008C01
24B855175
br24B82015C01
24K832590
29K5414
TLN6322A Xmtr. Chassis Kit (140-150. 8 MC)
EPD-7839-O
CAPACITOR, fixed: uuf; +10%;
500 vy; unl. stated
1500 GMV +100% max
250
assy.; incl. 21A112247 CAPA-
CITOR, fixed: 250 uuf; +10%;
850 v & 29R5360 LUG, solder
(No. 6)
2 sect. ; c/o:
1500
1500
18 45%; NPO (150. 8-174 mc)
36 45%; (136-150, 8 mc)
15
var, ; 2.7-19.6
3 +.25 uuf; 200 v (136-140 mc
only)
CONNECTOR, receptacle:
female; 12 cont.
COIL, RF
plate coupling (150. 8-174 mc)
plate coupling (136-150. 8 mc)
grid coupling
choke; 1.3 uh
choke; 1,0 uh
RESISTOR, fixed: 410%; 1/2 w;
unl, stated
47K
1.8 meg 45%
15K
3.3K; lw
120K
442%; lw
SWITCH, slider:
spdt
10 solder lug term.
ELECTRON TUBE:
type 8032
SOCKET, tube:
8 cont
EPD-7840-O
CAPACITOR, fixed: uuf +10%;
500 v; unl, stated
500
var, ; 2.7-19.6
var. ; 4.9-52.5
COIL, RF:
plate coupling: 150. 8-174 mc
plate coupling: 136-150. 8 mc
output coupling: 150. 8-174 mc
output coupling: 136-150, 8 mc
choke; 1, 3 uh
CONNECTOR, plug:
male; 1 cont
| P401, 403
LN6093A Chassis Hardware Kit
ez sail
EPD-7862-0
RADIATOR ASSY, : incl.
15B865665 HOUSING, radiator
34857308 SCREW: 4 req'd
FRONT PANEL
IN6002A Front Panel Kit
EPD-7863-O
NON-REFERENCED ITEMS
55B852658
414864597
554852656
6108A & TKN6109A Intercabling Kit
9A 86 7432
28C802820
80C82376C04
br80C 82762A09
28A474006
HANDLE
SPRING, 2 req'd
LOCK, incl. ; 2-55K893872 KEYS
CONNECTOR, recep:
female; 1 cont
male; 19 cont
RELAY, armature:
coax; 12 v; 1 form ''C"'; incl
RG-58/U and RG-188/U coax
cable
CONNECTOR, plug:
male; 1 cont
EPD-7825-O
65R4165
65B 475247
65R52293
1V864644
1V864643
1V80705A19
1V80705A18
30C858513
pr 30C864650
1V80705A07
1V80705A10
FUSE, cartridge:
15 amp; 32 v
6-1/4 amp; 32 v
5 amp; 250 v
CONNECTOR, plug:
incl, : 9€801050 CONNECTOR,
plug: 19-cont. ; female
15D82075D03 HOUSING L, H.
15D82075D01 HOUSING R. H,
38131758 SCREW, 4-40 x 1+1/8"
2 req'd 25129924 NUT, hex:
4-40 x 1/4"; 2 req'd;
1V80717A73 SCREW & KNOB
ASSY. 4A11722 WASHER, '"'C"
44800671 WASHER: . 016''thick
4A82113D01 WASHER: . 032"
thick; 42K867086 CLAMP, cable
38132127 SCREW, tapping: No. 6
x 3/4" plain hex head
CABLE ASSY., special purpose:|
i 0K858553 CABL’ lower:
incl:
l cond, No. 12 ga; RED;22-1/2
ft. req'd 29K832116 LUG, for
3/8" stud; ref parts F401 and
XF401
incl: 30K858552 CABLE, power:
1 cond; No, 12 ga. ; BLK; 5-1/2
ft. req'd 29K832116 LUG, for
3/8" stud
incl; 29K824456 LUG, for No.
10 stud 37B82603D20 SLEEVE,
coded No, 20 29A82602D01
CONNECTOR, plug: | cont; ref
part XF402
incl; 29K865065 LUG, for 3/8"
stud 37B82603D19 SLEEVE,
coded No. 19 29A82602D01
CONNECTOR, plug: | cont; ref
part XF403
CABLE, special purpose:
13 cond. 17 ft. req'd. 1-freq.
17 cond. 17 ft. req'd. 2-freq.
FUSEHOLDER:
incl. 14A82882A01 BODY
14482883A01 CAP; 42A82884A01
CLIP, fuse: 2 req'd.
incl: 14A82882A01 BODY
14482883A01 CAP 41A82885A01
SPRING 1V80705A08 FUSE CLIF
AND LEAD ASSY,: incl:
42A482884A01 CLIP, fuse
10M343 LEAD, elect: 1 cond.
No. 18 ga. ; ORG; 57" req'd
1V80705A09 FUSE CLIP AND
LEAD ASSY.: incl: 42A82884A01
CLIP, fuse 10M343 LEAD,
elect.: 1 cond. No. 18 ga. ;ORG;
9" req'd ref part F402
incl. : 14A82882A01 BODY
14A82883A01 CAP 41A82885A01
SPRING 1V80705A1] FUSE
CLIP AND LEAD ASSY. : incl:
42482884A01 CLIP, fuse
10M345 LEAD, elect; 1 cond; No,
18 ga. ; GRN; 97" req'd
1V80705A12 FUSE CLIP AND
LEAD ASSY.: incl: 42A82884A01
CLIP, fuse 10M345 LEAD,
elect. ; 1 cond; No, 18 ga. ;GRN;
9" req'd ref part F403
NON-REFERENCED ITEMS
29A82602D01
37B82603D01
37B82603D02
37B82603D03
37B82603D04
CONNECTOR, plug: male; single|
cont. ; 19 req'd
SLEEVE, coded:
1
2
Bs:
4
37B82603D05
37B82603D06
37B82603D07
37B82603D08
37B82603D09
37B82603D10
37B82603D11
37B82603D12
37B82603D13
37B82603D14
37B82603D15
37B82603D16
37B82603D17
37B82603D18
37B82603D21
TCN6025AE, AF, 26AE, AF Control Heads
DS501, 502
R501, 502
R503
R504
R505
R506
XDS501, 502
XF501
XF502
65R4151
65R52293
65R4165
65B475247
9K830418
9C 801050
9B855112
17C82350A04
18K857840
6R5581
6R6320
18K868896
r18C857698
6R6336
r40K80247
40A80246
310857699
1V80705A13
1V80705A06
30K831572
304825430
9B863168
31A824974
1V80705A07
FUSE, cartridge: (Dash md
5 amp; 250 v
15 amp; 32 v
6-1/4 amp; 32 v
CONNECTOR, recep:
female; 4 cont
female; 19 cont (Dash moust
CONNECTOR, plug: (Das
mount)
female; 2 cont; does not int
15B855111 COVER
RESISTOR, fixed: unl state
33 +10%; 2 w
var; 25K +30%; .33 w
3.3K £10%; 1/2 w
10K +10%; 1/2 w
var; 25K £30%; .33 w; ine
switch; l-freq
var; 25K 430%; .33 w; 2-f
270 10%; 1 w
SWITCH, toggle:
p/o R506 and I-freq.
dpst ("on-off"); 2-freq.
dpdt ("F1-F2'); 2-freq.
BOARD, term: (Trunk mou
35 female cont term.
iq.
CABLE, power: (Dash modp
assy; incl F502, XF502
30K813233 CABLE, pwr;
ga; RED; 9-1/2 ft. req'd;
29K832116 LUG, for 3/8" #
LEAD, elect: (Dash mount)
assy; incl "in-line" fusehoR
with attached conn. leads ap
ref part XF503; 29K824456
LUG, for No. 10 stud
CABLE, power: (Dash mo!
No. 10 ga; BLK; 10 ft req'd
WIRE, elect. ; (Dash moun’
2 cond; No. 18 ga; 36" req
LAMPHOLDER,
1 cont
FUSEHOLDER,
clip type
incl 14A82882A01 BODY,
14A82883A02 CAP,
42A82884A01 CLIP, fuse 2
req'd; 41482885A01 SPR)
assy; incl ref part F503 a
14A482882A01 BODY;
14482883A01 CAP;
41A82885A01 SPRING;
1V80705A08 FUSE CLIP AM
CLIP, fuse, 10M343 LEAD
elect.: 1 cond; No.
57"! req'd; 1V80705A09 F'
CLIP AND LEAD ASSY: in
42482884401 CLIP, fuse
10M343 LEAD, elect, No.
ga; ORG; 9" req'd
NON-REFERENCED ITEMS
614865158
61K865159
3A82670A01
36K858652
24482070
LENS, RED
LENS, GRN
SCREW, control head
KNOB, control: 2 req'd
NUT, ring: knurled
EPD-7864-0 “© @
TMN6000A Dynamic Microphone
AMPLIFI
1V861317 mic p ;
1V859 BOARD,
ref parts C601, Q601, R601,
602, 603, 604
CAPACITOR, fixed:
20 uf +100-10%;
230844927
r23C82601A03
CARTRIDGE, microphone:
iz
590852603 dyn type; 175 imp at | ke
CONNECTOR, plug:
male; 4 cont incl 41K838823
SPRING
ANSISTOR, (SEE NOTE)
48A124317 ; 1 1448611 9€
6R6080
6R5581
6R5621
6R5660
SWITCH,
40C82202B01 | push: dpst; ¢
1V80707A58
847034 LUG,
art P60l
NON-REFERENCED ITEMS
1V864588 BACKHOUSING AND Hi
STUD ASSY
424852710 STRAP, strain relief
15K858486 HOUSING, front
13K858488 GRILLE
35A852701 CLOTH, grille
324852702 GASKET
144857138 INSULATOR
424852705 CLAMP, cartridge
144857137 INSULATOR, cartridge
4K661625 ASHER
1V 865398 MOUNTING KIT, microphone
incl 64A85596 BRACKET
NOTES:
Replacement transistors and
Motorola part number on
PARTS LISTS FOR PRINTED CIRCUIT ASSEMBLIES ARE
ARE ON THE BACK OF THE CORRESPONDING
PRINTED CIRCUIT DIAGRAM.
MOTOROLA INC. COMMUNICATIONS DIVISION
SERVICE DIAGRAMS
MOTRAC
MOBILE FM TWO-WAY RADIO
1ISe-1742 MC 25 W RF POWER
+12 VOLT SYSTEMS
CARRIER SQUELCH MODELS
)
ae a
ysl U4$HH't- LOOOD . U43HHT-1100D
my “yf U43HHT+1910D | U4&3HHT-1110D
@ . 50". ya3nnrceyop ~— v43HHT-11300
a ‘\ r , {- , :
2 ; x yy
1% > | 45
\
A
m £
PRINTED IN U.S.A. f om 68P81011A50 ;
@ Reg. U.S. Pat. off. ; ° hee . nat 4 A. y
CONTENTS
Schematic. Diaryranvanc’ Far teclite ty ote. srt ho en), <r Wonese thee ey (le a! |g ee 63E81011A51
ATeG GA =" Distribution Detail sew eet Mieco Sd eek oda Ce fe” Soya, ico Nee EEPD-7645
Circuit Board Location Details. . . Ay Neen ee pete Me uk Vea tT Cer MP IM eR 6 EPD-7687
lst Oscillator Circuit Board Detail and ore tase A Le ef SO ei aE) EPD-7615
Ss\iGatke GircuitesoardeDetarlacn delxa it Sail gd Sanne wes) lo tie meter ceas dt), *.) cee EPD-7623
A2AndsOcerllatornscrncultssoardsperatieand seacris itt s.cauemn lanes eae.) ecw nee EPD-7619
455. KC Filter:Amplitier Circuit Board Detailjand: Parts List 95) 2. = .-)\ sesame EPD-7699
Ab SwiGethaCimeitte poarch etatleancdal cit ibSm lilo Cr meen aleet me i outta ite eum mend EPD-7610
Audiovand:Squéelch Circuit Board Detailvand (Parts bist 27a.) . ss) eles), ees EPD-7638
Exciter Circuit Board Detail and Parts List . . . be SNS 2) cl an on Sa a EPD-7640
Rectifier and Filter Circuit Boards Detail and Parts Uist Eh le PR, oS. = EPD-7643
IMPORTANT
Refer to Instruction Manual 68P81011A45
for descriptive and other service
information.
PARTS LISTS FOR PRINTED citer BOARDS ARE~ an
ON THE BACK OF THE CORRESPONDING PRINTED fi. on&
CIRCUIT BOARD DE” AILS ~~
a " ail, ae
spear oe fe’ ff
& Ape "
Copyright 1962 by Motorola, Inc.
Pc | A ERE, OES) aR: SOON 1B ee See ee ae he. ’ ae a. a oe gh: St! eee
Via
USED IN k.
"MOTRAC" DIAGRAM BOOK
68P8I011A50
4
400V0C -
Bt++
T201 {
, See R202
en WHT-BRN REO-BLU 470K
: Cw 7
RED-YEL
B+ Se read
TO TBIO1-4
FRO
TO TRANS
RELAY
1)
te
=u
ee
EEPD-7641-O
i. veh BIAS-17 vOC BK ‘
(3 LEADS) O TBIOI-6 5% Cee >
‘ a TO TOI-8 ~
-R205“GRN-WHT =
£
(YRSE POLARITY PROTECTION is
; RECTIFIER BOARD
Obs
CRYSTA
P-
FRO
TO TRANS
RELA
TO NETTI
EEPD-5930-O
‘ FROM FROM
To TO R207 & B T201 T204
T201 FEEDBACK SEC. SEC.
“fe
K
-—
WHT-RED RED-WHT-BLU RED-BLU RED
FRI
TO RC
A+ UNFII
FROM P@% ~
A+ Fill
FROM PR
TO RCVe
TO RCV| a - ( :
A- Fl
FROM A
EEPD-7648-O
MIKE
TO XMTR.
B
TO XMTR. |
EEPD-5928-O
RED RED-WHT -|RED-GRN RED-YEL
A FROM FROM
T201 T201
SEC. SEC.
TO
C204B
-
’
Rectifier & Filter Circuit Board Details
Model TLN6223A-8 used in 136-174 MC,
* 25 W, +12 V, Carrier Squelch
"Motrac'' Power Supplies
Motorola No. EPD-7643-O
CONTENTS
schematic Diagram, and Parts Listen ais apy acd eee see Weaken se) 63E81011A51
Ate trpA="Dis ter butions Detarlmvarnn eae mien re mip mente Min eae Stk ue agement testy 5... aad enn EEPD-7645
Gircuit Board location Details) s) HME hen Wine ha | Hype mmr e LeRS e EPD-7687
lst Oscillator Circuit Board Detail and Parte List Ae ARS Waele ot Wi 55 ae eal MERE 0 o> iS EPD-7615
SO MGeLES Cir cuLeRD oandebetarleand: bartseleis tare ew ees Ce een Mee ure Qe) fc eee EPD-7623
ZndvuOseillatorizcinrcuitypoandeDetalimands mart oimulc tauemeed) | cous) wepeimsoes re! cl) SchiminCnnmmS EPD-7619
455. KC PilterAmplifier Circuit Board Detailtand: Parts: List.) 5 \) fey oe el eye EPD-7699
4 55u KGaA Gincuitep oasde Detar sandr att sacl ss bee mmr nunet Ouse. nar ca ie 1 tem. hou Ran ese EPD-7610
Audiowandss quelechsGircurt board Detailvand shaw Splits ti. mgm ciies) )) 2) esl alee teeny -E- EPD-7638
Exciter Circuit Board Detail and Parts List . . . ee Sat Sao, he EPD-7640
Rectifier and Filter Circuit Boards Detail and Parts ise Pl ict Meare. SA ae oo ee EPD -7643
IMPORTANT
Refer to Instruction Manual 68P81011A45
for descriptive and other service
information.
PARTS LISTS FOR PRINTED cingarr BOARDS AR
ON THE BACK OF THE CORRESPONDING PRINT
CIRCUIT BOARD DE” AILS ~~
a gern
4 ine
Copyright 1962 by Motorola, Inc.
De nee ; ola
OR 5c | * AL REST ED Sk) EL): SS ee ™ a sy ; ae ey! eee
y aepeeneresiemmemme SN _ oo
USED IN
"MOTRAC" DIAGRAM
68P81011A50
- 400VDC
. : B++
’ : T201 A
: FILTER BOARD L204 WHT-BLK RED-GRN kansas
BRN-WHT
BRN-WHT BLK NETTING
4 SWITCH
i 3L
6
se TO XMTR. TBIO-1 Lg
2g = XTAL. HTR. ‘
dR BRN
or piri meee =)
. K204 TRANS-RECEIVE
H2V BRN-YEL | RELAY
FROM J402-4 E i oe ae POLARITY CONN.
TO TRANS-RECEIVE % (j() Ga INE leo
RELAY (K201-3L) «BRN-YEL ie 10 “Scare <sS a 03
TO XMTR. _ BRN-YEL F3 o
CRYSTAL HEATER 15 ql__GRN 12 oS 4 ¢3
P-T-T GND _ , YEL-GRN aq! H3 | q83
FROM Aas
FROM
TRANS RECEIVE RED -BLU
XMTR.
RELAY (K201-iL) (TBIO1-4)
RED-BLU RED-BLU
207 REO-YEL
Je R
2R +78RN-BLU F202 &
B+200VDC
TO TB101-4
GRN CR209 R206 GRN-BLK BIAS-(7VOC
(3 LEADS) A i: MIC, OC ;
R203 TO TBIOI-8
RN-WH :
) 0402-13 => re 205“GRN-WHT ;
= JO Jivi-g «YEL-GRN Ses 7 ; BLA _ ES a = :
ee, ee TO TRANS-RECEIVE , YEL-GRN 9 TEL BLU, 151-3 E2! atk *
a RELAY (K201-A\ a = role Soe Z
= TO NETTING SWITCH 6a ; 'c2 4
Ma +42V 10 qt__YEL-RED, 9° XMTR. F2 OSC. G2! 4 ’
=) FROM J402-12 162! | =< B2 Ps
—& B+ g ql __YEL- BLK 3 ns <S | 2
io) TO TBIOI-1 RED-BLU, To TRANS-RECEIVE t+. —YELBRN®” © TO XMTR. Fi OSC. | Ss a2 .
(XMTR. FIL) RELAY (K201-2L) T+ ayer 181-4 aes
: TO TRANS-RECEIVE ; : E | in
RELAY (K201-B) ; SUFFIX Fil ss
RED-YEL y ley NOTE :
: ; (NOT USED) {DENTIFIER ci SF (2. CR21O IS A REVERSE POLARITY PROTECTION Z
FROM ANTENNA , BLK-WHT ~ TO C201D Tl DIODE FOR POWER SUPPLY. ¢
7 — at
en ies RECTIFIER BOARD
D = ==
J201 P204 ee a an
+- TO ANTENNA , BLK-WHT
f RELAY - Botta: T201 FEEDBACK B SEC. seq
; ay RED-WHT, } wee
eet dogs pBLM-WHT DRIVER & POWER AMPL. WHT-RED RED-WHT-BLU
RED-WHT, To c201B
BRN-BLU = : :
: TO RCVR (TBi-9) fe.
7. RED cheb Sones BRED-WHT, To C201A
7 ! A+ UNFILTERED , BRN- BLU : , | Bp : : ___RED-WHT,
2 FROM P201-D2 a : o TO C204
RED-BLU
pee) TO c202
A+ FILTERED BRN-RED Si (COMMON) , GRAY
i) TO RCVR (TB1-1) «BRN-RED ee Tet, B PRIMARY
A, -
ia} D -Bek-wHt
BLK
A To ¥402-6 «GRAY ae Te E
TO RCVR (TBI-8) «GRAY , : mis C
A- FILTERED , cray w . GRN-BLK
FROM P20i-Ci CG
MIKE DC GRN- WHT
° TO XMTR. (TB4O1-8)
r BA BIAS GRN-BLK a
a TO XMTR. (TBIO!-6) ead
x &
¥
a “7 FROM T20i , GRN
SECONDARY
153)
& NOTE : y
Se AT RiNGES RCEMER Sno
1 .
CORRESPOND! RED-WHT RED-GRN RED-YEL
4
: TO FROM F
, cooas «=CA T201 Tot
p SEC. SEC.
I Rectifier & Filter Circuit Board Details
i Model TLN6223A-8 used in 136-174 MC,
) . 25 W, +12 V, Carrier Squelch
"Motrac'' Power Supplies
| Motorola No. EPD-7643-O
ey ante,
a ae eel
px
cs
y)
Sw
Ga:
EEPD-7637-O
DEPD-6221-O
‘ USED IN
MOTRAC" DIAGRAM BOOKLET
—68PBIOHA5O 6 8P81014A55
Audio & Squelch Circuit Board Detail
Models TLN6208A-7 & TLN6221A-7 used in
136-174 MC, +12 V, Carrier Squelch
"Motrac" Receivers
Motorola No. EPD-7638-O
PARTS LIST
POWER SUPPLY
TPN1010AA POWER SUPPLY, 25 W
TLN6223A Rectifier and Filter Kit; consists of:
1V80702A80 Rectifier Board Assembly
1V80709A36 Filter Board Assembly
EPD-7643-O
DESCRIPTION
1V80702A80 Rectifier Board Assembl
MOTOROLA
REFERENCE
SYMBOL
PART NO.
SEMICONDUCTOR DEVICE,
diode: (SEE NOTE)
CR201, 202,
203, 204, 205,
206, 207, 208
CR209
48D82723C03
or48D82383B04
silicon; 300 v
48D82723C01
or48D82383B07
48B 865848
Silicon; 100 v
CR210
silicon
1V80709A36 Filter Board Assembly
CAPACITOR, fixed:
35 uf +100-10%; 100 v
COIL, RF:
35 mh
300 mh
25C82379A01
25C82380A01
RESISTOR, fixed: +10%; unl.
stated
33;2w
8K +5%; 3w
1, 2K; Liw
1K; lw
6R 488016
6C82394D02
6R5770
6R6327
R201
R204, 210
R206
R209
MISCELLANEOUS
(NOT PART OF RECTIFIER & FILTER BOARDS)
FUSE:
F202 65R20404 3 amp; 250 v
TLN6270A Relay Kit
K201
P201
TLN6224A Transformer Kit
RELAY, armature:
80D82197B01| dual stack; Ist stack, 1 form
"A" and 1 form "'B"; 2nd stack;
lform "A"; res. 80
CONNECTOR, plug:
male; 12 cont. ; c/o;
14B82337A01 INSULATOR, plug
29C82335A01 TERMINAL, male:
3 req'd
TRANSFORMER, power:
c/o the following windings:
pri. ; BRN, BLK with center tap
(3) GRAY; sec. No. 1; RED-
ORG, RED; sec. No. 2; RED-
BLU, RED-GRN; sec. No. 3;
GRN, GRN; sec. No. 4; WHT-
BLK, WHT-BRN with WHT
center tap
T201 25D82662A01
TLN6186A Power Supply Chassis
CAPACITOR, fixed:
3 section; c/o:
0.5 uf +20%; 1100 v
0.5 uf 20%; 1100 v
common
1.0 uf 420%; 450 v
25 uf +50-10%; 450 v
3 section; c/o:
50 uf +50-10%; 25 v
8D82390A02
23K868705
23K868706
1500 uf +100-10%; 25 v
500 uf +250-10%; 25 v
REFERENCE
SYMBOL
MOTOROLA
PART NO.
DESCRIPTION
CONNECTOR, receptacle:
female; 15 cont. ; c/o:
14C82338A01 INSULATOR, recp.
29C82336A01 TERMINAL,
female: 13 req'd
COIL, RF:
28 uh
choke; 70 mh
25C82600A01
25B82878A01
RESISTOR, fixed: 10%; 2 w;
unl. stated
6R2080 470K
6R5736 47K
17C82381A01] 3 5%; lO w
6R 6327 1K; lw
SWITCH:
40B82786A01} dpst
SOCKET, transistor:
XQ202, 203, female; 2 contact
204, 205
9B82287A01
TLN6196A Heat Sink Kit
TRANSISTOR, (SEE NOTE)
Q201, 202, 203,, 48A124331 P-N-P
204
NON-REFERENCED ITEMS
BS Fre
TLN6191A Chassis Hardware Kit
RESISTOR:
R205 6R 6038 1,5K +10%; 1/2 w
NOTE:
Replacement transistors or diodes must be ordered by
Motorola part number only for optimum performance.
EEPD-7637-O
DEPD-6221-O
a,
DUPLICATION OF CONTROL HEAD “ AUDIO
40 CIRCUITRY AND INTERCABLING CONNECTIONS 412 Q16
TO J402-44 S GRNG RED SRN FROM J402-15 M4573
aR J502-110R- TES
sas 4902-1 TBS501-11 R505 et ov £50.
\ J502-11 OR
0.2 J402-45
UF
(VOLUME)
O
| 4502-44
OR TB50i-15
402-14
CARRIER NOISE >
FROM 44
J402-14
NOTE:
LIMITER
Q2a4
4. PART OF CONTROL HEAD CIRCUITRY IS DUPLICATED IN RECEIVER SCHEMATIC,
6. Q19 & Q20 ARE LOCATED BEHIND FRONT PANEL.
7. USQ=RECEIVER UNSQUELCHED.
FSQ=RECEIVER FULLY SQUELCHED,
44. IN SPLIT-CHANNEL RECEIVERS, C346 IS CONNECTED DIRECTLY
TO Q24 BASE. WIDE-CHANNEL RECEIVERS INCLUDE
FILTERING COMPONENTS.
9-4AV USO:
7.5V FSQ. C342
R342
FROM A+
CONTROL FILTERED
VIA J402-15 FROM TBI-4
Oee (1) 023 R327
A> MH M4573 Dk
FILTERED «sz Sy
TO RF DECK 15 Gav usa
75V FSQ.
g.4V USO.
Z5V FSO.
C337
O45
R344 R340
5.6K 3.9K UF
ae = fc347
12ev usa, ‘SUF C348 OVUF
A+ nee 105 GAA ees. O4UF .
FILTERED gen-kt'5 , FGF ye
TO RF DECK j :
wy Oe Visor tisur—~
12.7 V FNC359 S22" R338 ie ONLY NOTE fa
RT302 3300 Q24 1.8K 5.7
MK SS R336 a p)Nas73 R335 “i |
3.3K 11.5V¥X39K 30s ==> TO CONTROL HEAD
L310 5.7MH R504/R505
A C335 VIA 402-44
CHANNEL O.2UF
US Neo Wie Nore a _,INPUT
TLN6221A-—7 OS SC OUF GRN-RED FROM DISCRIMINATOR
SUFFIX aS
IDENTIFIER
ORG 5
FROM
SQUELCH
CONTROL
VIA J402 —14
T301
DRIVER OUTPUT
(017) (018) 019
M4313 M4608 NOTE
R330
68K, 1/2W “yesaa
Q20
M4608 pry
EMITTER
OUTPUT
TO T303
(ON RCVR CHASSIS)
At UNFILTERED
FROM TBIi-9
A-
FILTERED
FROM TBi-8
su, OUTPUT
TO T303
(ON RCVR CHASSIS)
'YEL-GRN
BASE
-OR-
COLLECTOR
BASE OLLECTOR
TRANSISTOR DETAILS
USED IN
"MOTRAC" DIAGRAM BOOKLET
68P810144A50 68P81014A55
Audio & Squelch Circuit Board Detail
Models TLN6208A-7 & TLN6221A-7 used in
136-174 MC, +12 V, Carrier Squelch
"Motrac" Receivers ;
Motorola No. EPD-7638-O
ind
~~. oe ~
af Pe es a
‘i .
re,’ Na els
;
oe ‘ne
A ‘
i
))
d)
DEPD-7639-O
DEPD-7454-O
DEPD-7455-O
RuU7
|BIAS -47VDC
TBIOI-6
FROM TBi01-8
BIAS
FROM TB{01-6
FROM TBiOi-4
FIC:
FROM TBiO{-1
1.8 MEG.
1/2W,5%
d USED IN
MOTRAC” DIAGRAM BOOKLETS:
68P81011A50, 68P81011A55
Exciter Circuit Board Detail
Models TLD6160A-10, TLD6170A-13 & TLD6210A-3
Used in 132-174 MC, +12V, Carrier Squelch
"Motrac" Transmitters
Motorola No. EPD-7640-O
PARTS LIST
TLN6208A Audio & Squelch Board (Wide Channel)
TLN6221A Audio & Squelch Board (Split Channel) EPD-7638-O
REFERENCE | MOTOROLA
SYMBOL PART NO. DESC aoN
CAPACITOR, fixed: uf; +10%;
200 v; unl. stated
C335, 338, 346 8R 127402 0.2 +30%; 50 v
C337 8K865659 0.15 420%
C340 23K865137 4.7 420%
C341, 349, 351,) 23K865136 1S 22.0% 5) 25 )cy:
352, 353, 366
C342 8K857472 . 047
C344, 345 8C82427B01 - 068; 50 v
C347, 348 8K857473 . 01 (wide channel only)
C350 8K861939 3300 uuf; 100 v
SEMICONDUCTOR DEVICE,
diode: (SEE NOTE)
48C82178A06] germanium
COIL, RF:
L308, 309 24K864763 5.7mh;BLK-RED (wide channel
only)
L312, 313 24K864737 0.62 mh; BLK-BRN
REACTOR,
25B82738C01] choke; 90 mh; 60 ohm
TRANSISTOR, (SEE NOTE)
Ql6, 21, 22, 23] 48R134573 P-N-P; type M4573
Q17, 18 48A 124313 P-N-P; type M4313
RESISTOR, fixed: +10%; 1/4 w;
unl, stated
R318, 339 6K129225 10K
R320 6K128689 OPAL
R321 6K129145 82K
R322, 323 6K128688 ens
R324 6K127804 4.7K
R325 6K127802 1K
R327 6K129887 12K +5%
R328 6K129620 560
R329, 333 6R 6406 225 Li 2 we.
R330, 331 6R6074 68K; 1/2 w
R332 17C82350A05| 0.16; lw
R334 6R6291 560; 1/2 w
R335 6K128903 39K
R336 6K129231 3, 3K
R337 6K128599 680
R338 6K129269 1.8K
R340 6K129232 Sip SUES
R341, 342 6K129433 5.6K
R355 6K129753 100
THERMISTOR,
6B82769A01 10 ohms
6B858402 1K ohms
VARISTOR,
6B858401 17.2K @ 8.8 v
TRANSFORMER,
250852298 pri: res. 330; sec: res. 7; tapped
25C852299 pri: res. 670; tapped; sec: res.
13; split winding
NOTE:
Replacement transistors and diodes must be ordered
by Motorola part number only for optimum performance.
DEPD-7454-O DEPD-7639-O
DEPD-7455-O
| USED IN
F{ OSC. MODULATOR DOUBLER TRIPLER a
"MOTRAG” DIAGRAM BOOKLETS
met ve"T060 72"7060 Se 2077 6¢-s7mc 68PB1011A50, 6BPBIO11A55
Pee 5.3, Pay, cio7 ~ Clog C442 a NOTE 3 es NOTE 3 _ |
iO
]-333-
14,504 Soe
/2W Riis | CMU7
eae
10K 620 L- —
v2we
NOTE 2 u
DS eS RI
cioa| creat Riae LRI39 ork
Te ce (00K 233 /2w | METER
2000! 45uF!— °1/2W
= ++ +
B+200VDC B+200V0¢C B+200V0C B+200VDC 8+200V0C >
_2 FREQ MODELS ONLY TBIOI-4 TBIOI-4 TBIO1-4 TBIOI-4 TBIOI-6
BIAS ~I7VDC
B+200 VDC TBIOI-6
TBIOI-4
TBI0i-8
B+200V06
TBIOI-4
T1,72
TERMINAL
DETAIL
TLO6I60A10
TLD6170A-13 ores!
OUTPUT TLD6210A-3 2. =F coRtiGhT WEIGHT DASHED CIRCUITRY B+ SWITCHED GROUND
ane SUF FIX U 2 FREQUENCY OPERATION ONLY, METENIEUETERT *OloccareR briven Eon
pouster oriver IDENTIFIER 3. SEE PARTS LIST FOR COMPONENT VALUES. J1O4 {01-5 & POWER AMPL. VIA #402-10
I
WHT- |WHT- |RED- \yeL-
YEL _|GRN [BLU May
AUDIO
INPUT
FROM TBIOi-10
Bice eee
MIC. DC __,GRN-wHT y ae
FROM TBIO01-8 : ae
BIAS GRN-BLK
FROM TB{04-6
T2 : : . : :
cope : 1 ; : ‘A ——, +12V
‘ ie ¢ ee . ; 333k , one. “= 9 —— JOWER SUPPLY”
) i . ereec er afl — ~ ’ NLTER BOARD)
@ ly x . ea ‘ i T
‘© [ s ; GND.
B+ _Re0-a.u a iis ell —f é =
FROM TBiO{-4 = ' y qt 8 : REQ
FIL, ern ack 2) - ey y ii ; :
FROM TB{O{-{ ~~" = y | - yi
no, 2X
NOTE 2 JBLK
() - BOTTOM PLATING
ry bs TO ated Exciter Circuit Board Detail
er eeent ibe) wtoasee Models TLD6160A-10, TLD6170A-13 & TLD6210A-3
Used in 132-174 MC, +#12V, Carrier Squelch
USED WITH PARTIAL SCHEMATIC "Motrac" Transmitters
OF DIAGRAM NO.
63E 81011451, AS6
Motorola No. EPD-7640-O
p/o 63E81011A51-O
Ae ss
LEGEND USED IN
ae "MOTRAC" DIAGRAM BOOKLETS
P/O TBI ai 68P81011A50 68P81011A55
bea BRN-RE&
10327 W)
| NOTE (2) Yi
pte phe pth SLB SERS GN
|ETC. = A+ AND A- TIE POINTS REFERENCED TO SCHEMATIC DETAIL.
DIODE
14 ae ae a a A
INPUT A+ INPUT
ROM FROM
ITY PLUG POLARITY PLUG
ne P20i-D2
THESE LEADS {4
THROUGH HOLE
AND ROUTED Ty
BRN-BLU
aw am cme war sat ae ca aa ce a a ae ae a ae
c2
a8 |
HOLE "B". ~
~
pe Pap a, tag es bee Soh at mae
BRN-RED
BRN-RED
N
\
4
es
t)
FROM CENTER
TAP OF T304
PRIMARY Fe
SWITCHED A-
(2-F REQ. ONLY)
DIO & SQUELCH
BOARD
A+ & A- Distribution Detail
For 136-174 MC, +12 V, Carrier Squelch
"Motrac'' Radio Sets
Se oe eee ena SES BLU ws Motorola No. EEPD-7645-0
AT A a A A LS A A A LS LP LP A LPL LE A ELE LP EY ET TE A ET LF A
LP LE LP PP EP LPP FE EP LE PP LS LE A PN a
a
PARTS LIST
TLD6210A Exciter Board Kit (1-Freq) 136-150.8 MC
TLD6160A Exciter Board Kit (1-Freq) 150. 8-174 MC
TLD6170A Exciter Board Kit (2-Freq) 150-174MC EPD-7640-O
REFERENCE MOTOROLA
SYMBOL PART NO.
C101, 152
roe. 153
C103, 154
C104, 106, 115,
116, 151, 155
C105 21K857337
C107 21K840711
C108 21B401029
C109 21K847743
C110 21B800801 1500; GMV +100% max.
Cl1ll 230844927 20 uf +100-10%; 25 v
ior23C82601A03] 20 uf +100-0%; 25 v
C1l2 21K850118 100 45%
oy i 21B801139 . 01 uf +80-20%; 600 v
C1l14, 117, 118,) 21B837745 820
120, 157
C119 21D82355B19}) 6 5%; N470 (150. 8-174 mc)
or21K840811 10 +5%; N470 (136-150. 8 mc)
C121 21K849332 3 +. 25 uuf; N750 (150. 8-174 mc)
or21K859216 8.2 +. 25 uuf; N470 (136-150. 8 mc)
C128, 129, 140 23K865136 15 uf 20%; 25 v
C137 23C82601A03] 20 uf +100-0%; 25 v
C138 8K864428 0. luf; 100 v
C139 23K867670 5 uf +100-10%; 25 v
C141 21K857334 3300
C142 21K848158 390; 300 v
C143 21C82606A01] .02 uf +60-40%; 100 v
C144 21K864739 12 +5%; N470 (136-150. 8 mc)
or21K861749 16 5%; 250 v; N470 (150. 8174 mc)
C145 21D82355B19] 6+5%;N470; (136-150. 8 mc)
or21K864739 12 5%; N470; (150. 8-174 mc)
DESCRIPTION
CAPACITOR, fixed: uuf 410%;
500 v; unl. stated
var; 5-25; NPO
21K847874 12 +5%; NPO
21K859178 270 45%; 300 v
21K837746 2000
20K859643
7.5 +.5 uuf; NPO (1l-freq. only)
51 45%
02 uf +80-20%; 600 v
8 +.5 uuf; NPO
SEMICONDUCTOR DEVICE,
diode: (NOTE I)
48B857965 silicon
COIL, RF:
L105, 114 24V80900A15| choke; shl'd;.62mh;BLK-BRN
L106 24V80901A23] choke; shl'd; BRN; 10. 5uh
(150. 8-174 mc)
or24V80900A42] choke; shl'd; RED-YEL; 16.0uh
(136-150. 8 mc)
25C82867C0l| choke; a-f; 6h
24D82480B01] suppressor; RED-ORG
TRANSISTOR, P-N-P; (NOTE 1)
48R 134573 germanium; type M4573
RESISTOR, fixed: +10%;
1/2 w; unl. stated
18K 45%
6R6410 33K
R101, 135
R104, 137
R106 6R5690 6. 8K; 2 w
R107 6R 6048 47K
R108 6R2089 1, 8K
R109 6R6229 1K
R110, 118 6R 6434 27K
Rlll 6R 6487 39K
R112 6R5620 1.8K; lw
R113 6R 129526 33K 45%; 1/4 w
R114 68400812 470 45%
R115 656320 10K
R117 6R401017 1.8 meg +5%
R126 6K129861 68; 1/4 w
R127 6R 400058 560 45%
R128 6K 129805 1K 45%; 1/4 w
R130 6R 488187 27K £5%; 2 w
R132 6R2061 180K 45%
R133 6R6480 22K 45%
R134 18C855155 var; 200K 420%
R138 6K129681 1.5K 45%; 1/4 w
R139, 143 6R2036 33
R140 6K 129887 12K +5%; 1/4 w
R142, 144 6K 129226 100K; 1/4 w
6R488095
REFERENCE MOTOROLA
SYMBOL PART NO.
24B82171D01
DESCRIPTION
TRANSFORMER, RF:
dblr coil; incl. C144, 145, R113,
114 and (2) 1A82354B03 CORE,
tuning: RED (150. 8-174 mc)
dblr coil; incl. C144, 145, R113,
114 and (2) 1A82354B03 CORE,
tuning: RED (136-150. 8 mc)
tripler coil; incl. C119, 120, 121
and (2) 1A82354B04 CORE,
tuning: RED (150. 8-174 mc)
tripler coil; incl. C119, 120, 121
and (2) 1A82354B04 CORE,
tuning: RED (136-150. 8 mc)
pr24V80901A37
24B82165D01
pr24B82246D01
TRANSFORMER, AF:
pri: RED-BLU; res 1020
sec: GRN-BLK; res 7100
25C837249
ELECTRON, TUBE:
V101, 106 95T277A01 | type 7167
Vv 102 95T276A01 | type 7060
V103 95T319A01 | type 8077
CRYSTAL UNIT, quartz:
(NOTE II)
xmtr. control (1-freq.)
xmtr. control (2-freq.) incl. Y101
ZNN-3A
ZNN-3-3A
SOCKET, tube:
7 contact
9 contact
XV101, 201
XV102, 103
9C857351
9C858152
SOCKET, crystal:
6 contact
XY101, 102 90855941
NOTES:
I, Replacement transistors must be ordered by
Motorola part number only for optimum performance,
Il. When ordering xtal units specify car. freq(s), xtal
freq(s) and xtal type no. Xtals are part of the Radio
Set Model. When ordering an EXCITER CIRCUIT BD,
xtals must be ordered separately.
For 136-174 MC, +12 V, Carrier Squelch
"Motrac" Radio Sets
LEGEND SED IN
Ae Povonal| ens naee NOTE: SS Ss “MOTRAC™ DIAGRAM BOOKLETS
Re Rae Re Selo : ; 6EPBIONIASO — GBPBIOL1A55
MH MH MH P/O TBI REFER TO THE INDIVIDUAL PRINTED CIRCUIT DIAGRAMS
[esee) _[c77 = AND THE OVERALL SCHEMATIC DIAGRAM FOR LOCATION A+
cc A+ OF COMPONENTS AND CONNECTIONS TO THE A+ AND A-
“01 0.25 BRN-RED | FROM :
Uk UF =* 5 01-Dl Oo DISTRIBUTION NETWORK
=) |= 333 | c332 327 [ ] WWW
IMPORTANT ss +4 [43 [ae |-927 927 Taore FILTER BOARD Yfvugvhy -------------- fs
c76| c366|, c3s650 = = =? lw P/0 Yfp)$6é
+1, +2, -1, -2 etc. ARE CIRCUIT TIE POINT INDENTIFICATION NUMBERS Ga= oe done a O © |.__PoweR supply
AND DO NOT CORRESPOND TO VOLTAGE READINGS AT THESE POINTS. -5 +1, +2
_4/ ~2 ETC.= A+ AND A- TIE POINTS REFERENCED TO SCHEMATIC DETAIL.
FROM ‘
C 46 Power =| (]
: SUPPLY []
fe) an, ue | BRN-BLU_ FROM O
a \ hoses la Oy * p20i-2 A+ Input LJ al
‘ CR304 - BRN- RED
< SieiMH A GRAY-GRN.. FROM FROM — BRN-RED a
a = = POLARITY PLUG
= = WS ~ p20i-c2 P204- Dt @
= c30 | !09 |c29 |c2e (- FREQ. A= POLARITY DIODE GRAY
a oe 0255 ver: lira ONLY SEE NOTE 4 ae atlye ea SESE TART =i Seog = 7 IR tama (nanan eines coat
. = uU U U U! : GRAY
ae = = SS SUS POLARITY PLUG ---p === -- A-INPUT A+ INPUT \
° P201- Ci FROM FROM \
= POLARITY PLUG POLARITY PLUG!
P201-C2 P20{-D2
a '
a THESE LEADS ARE PHYSICALLY FED ; \
r THROUGH HOLE "A" IN BOTTOM OF RECEIVER : e \
= BRN- RED AND ROUTED TO TOP OF RECEIVER THROUGH ET EWITCHED RAS GRAY Ce el aM:
HOLE “B". -FREQ. ON ~ !
ee ee eee re eer aN en ee a oo cnc ncmnenenmnetncbncieceneccnnconccnnnemmn tet RES ONOUN oo eee nee Peer ann nnn nnn x { BRN-RED
é
+4 455KC IF BOARD
'
ae
‘
Y S
> UY 3 TOP OF 4__}__, BOTTOM OF :
LD ‘ :
Lire <Y RADIO SET RADIO SET
17) iy @) ‘ ‘
‘ h
ne
‘ y
' ‘
‘ A ’
aa y |
y
‘ t 5 Z ry
H - = : i: \
amen 2S EREQUONLY 5 ae a ee ee aa eas 2 t YY t
YEL-BRN—*y \ Y YU, A { FRO
ES i WMAP [FROM CENTER |
O \ ‘ iF2
a ee \ -2 ee rea ‘SWITCHED A-
. \ ' \(2- FREQ. ONLY)
Oo Jo
\ BRN H H
BRN-RED al. \ Y O AUDIO & SQUELCH H H
0 Oo ‘ O BOARD \ \
YEO 2 0”0 0
‘ '
: O O O
Carlie" : pa 00 6 | |
‘
C326 Se ‘ \ \
a i a 5 ee -2
UWECS BLU Se (2 REQ ONLY) yea oe oad ec eeesenes be socsscs : H ‘ '
£ 355 PSS t i} ol | ]
\ \ a ZG oO \ H
-12 ,t +— RF DECK RF DECK-——> aR O \ \
TO 455KC es a re O \
nee 1} TO RF AMPL. Q4 ' @ H
&.. 1} EMITTER CKT. \ ] f= \ H
2 \ \
7 | Ele | :
Vay \ ’
@ 4 -6
TO RF AMPL. Q4 @=-jmmn nnn mw npen nd { H = ; uti ;
\ \ COLLECTOR CKT. \ \ A+ & A- Distribution Detail
: a \ H
Ney ‘ H
‘ } H
teat
13
8MC IF BOARD =
>
-
> A
BEPD-7617-O
BEPD-7616-O
TRANSISTOR
EMITTER
COLLECTOR
eA
ae %
USED IN ee .*
"MOTRAC" DIAGRAM BOOKLETS
68P81014A50 68P8104A75
68P81014A55 68P81011A80
68P8i014A60 68P81i011A90
68P81I014A65 68PBIONA9S
68P81011A70
2ND OSC.
08 |
M9003 |
Y303
(38.455MC
C331
-. yf 8 A-
SUFFIX Jee | Feb se Fi TERED
aa FROM 8MC IF
A+
O02 UF
oavecn wRILTE RED
FROM 455KC IF
At
FILTERED
TO 8MC IF
BRN-RED
4
i ee OUTPUT
TO BASE OF
2ND MIXER
2nd Oscillator Circuit Board Detail
Model TLN6483A
136-174 MC, '"'Motrac'' Receivers
Motorola No. EPD-7619-O
7\
PARTS LIST
TLN6483A 2nd Oscillator Board EPD-7619-O
REFERENCE MOTOROLA
SYMBOL PART NO. DESCRIPTION
CAPACITOR, fixed: uuf +5%;
500 v; unl. stated
100
30; N1500
.02 uf +60-40%; 250 v
21K850118
21K872060
21D82428B 18
C329
C330
C332, 532,035
TRANSISTOR, (SEE NOTE)
P-N-P; type M9003
Q8 48R 869003
RESISTOR, fixed: +10%; 1/4 w;
unl, stated
6K 129236 15K 45%
6K127807 33K
6K129237 6. 8K 45%
6K129753 100
CRYSTAL UNIT, quartz UNIT, quartz
ae 455 mc
NON-REFERENCED ITEMS
1V80721A76 | CIRCUIT BOARD ASSY.
(eyeleted)
NOTE:
Replacement transistors must be ordered by Motorola
part number only for optimum performance.
jae pk
BEPD-7698-O
BEPD-7697-O
USED IN
"MOTRAG" DIAGRAM BOOKLETS
68P81011A50 68P81011A75
68P81011A55 68P81011A80
68P81011A60 68P81041A90
68P81011A65 68P810141A95
68P810411A70
455KC AMPL.
A-
FILTERED
FROM 8MC IF
VIA FILTER
OUTPUT
TO FILTER
OUTPUT COILS
INPUT
FROM FILTER
INPUT COILS
A+
FILTERED
FROM 455KC IF
VIA FILTER
—X
SUFFIX aR
IDENTIFIER
(ON SIDE OF FILTER
HOUSING)
TO FILTER
INPUT COILS
455 KC Filter Amplifier Circuit Board Detail
P/O Model TFN6013AS & TFN6013AW IF Filters
Used in 136-174 MC, '"'Motrac" Receivers
Motorola No. EPD-7699-O
PARTS LIST
1V80721A77 455 KC Filter Amplifier Board EPD-7699-O
REFERENCE MOTOROLA
SYMBOL PART NO. DESCRIPTION
CAPACITOR, fixed:
220 uuf +20%; 100 v
.Ol uf 20%; 100 v
0. 1 uf +80-20%; 25 v
21D82428B20
21D82428B 19
21C82372C01
TRANSISTOR, (SEE NOTE)
P-N-P; type M9003
48R 869003
RESISTOR, fixed: +10%; 1/4 w;
unl stated
6K129231 3.3K
6K128687 6. 8K
6K127804 4, 7K
NON-REFERENCED ITEMS
1V80721A78 CIRCUIT BOARD ASSY,
(eyeleted)
NOTE:
Replacement transistors must be ordered by Motorola
part number only for optimum performance,
SS
DEPD-6373-D
DEPD-7609-O
DISCRIMINATOR
D IN SPLIT CHANNEL
LS ONLY.
Li3
2MH
R53
150K
c69 C70 R52 Loy
EE Si a ae 470 a7UF
-3 -3 -3- -3
METER , METER
J1-5 ficam,
=e METER METER
S ENCLOSED JI-4 J1-5
VALUES.
WHT-YEL WHT-GRN
SPLIT CHANNEL
MODELS ONLY
ane OUTPUT
TO CONTROL HEAD ~
VIA AUDIO & SQUELCH
EMITTER COLLECTOR ‘BOARD
TRANSISTOR DETAIL ee 7
455 KC IF Circuit Board Detail
Model TLN6480AS & TLN6480AW used in
136-174 MC "Motrac" Receivers
Motorola No, EPD-7610-O
=
PARTS LIST
1V80721A77 455 KC Filter Amplifier Board EPD-7699-O
REFERENCE MOTOROLA
RIP
SYMBOL PART NO. pad thea
CAPACITOR, fixed:
220 uuf +20%; 100 v
.O1 uf +20%; 100 v
0. 1 uf +80-20%; 25 v
21D82428B20
21D82428B 19
21C82372C01
TRANSISTOR, (SEE NOTE)
P-N-P; type M9003
48R 869003
RESISTOR, fixed: +10%; 1/4 w;
unl stated
6K129231 SOLS
6K128687 6. 8K
6K127804 4,7K
NON-REFERENCED ITEMS
1V80721A78 | CIRCUIT BOARD ASSY,
(eyeleted)
NOTE:
Replacement transistors must be ordered by Motorola
part number only for optimum performance,
DEPD-6373-D
DEPD-7609-O
A+
FILTERED
TO 455KC FILTER
WHT
INPUT “™
FROM 455KC
FILTER
A+
FILTERED
FROM TBi-{
BRN-RED
455KC IF. AMPL.-4
A-
FILTERED
FROM TBIi-8
GRAY
SUFFIX
IDENTIFIER
TLN6480AS
TLN6480AW
METER
Ji-4
WHT-B
455KC IF i.
Q
RN
455KC IF AMPL. 3
Qi2
METER
Jd-2
WHT-RED
455KC IF 4ST LIMITER
Q13
M4590
455KC IF 2ND LIMITER
Q14
M USED IN SPLIT CHANNEL
Ecce MODELS ONLY.
3yv R48 VA aah Eg er
eu ik
ahs ey,
c62| C64 C65
R46¢ 0.2 800
470 UF | 270
C66
(000
R45
Raq eR4a7_1C63
peo
UF
+4
=5)
NOTE:
43. RECEIVER COMPONENT VALUES ENCLOSED
IN OVALS ARE WIDE CHANNEL VALUES.
DISCRIMINATOR
BASE
EMITTER
SPLIT CHANNEL
MODELS ONLY
COLLECTOR
TRANSISTOR DETAIL
*
AO
USED IN
"MOTRAC" DIAGRAM BOOKLETS
6BPBIOIIA 68P81041A70
6B8PBIONA5S — 68PB1011A80
4
METER
Ji-5
WHT-GRN
OUTPUT
TO CONTROL HEAD
VIA AUDIO & 'SQUELCH
BOARD
KY
455 KC IF Circuit Board Detail
Model TLN6480AS & TLN6480AW used in
136-174 MC "'Motrac" Receivers
Motorola No. EPD-7610-O
re
«
’
a
+ <a et
=
‘wr
‘age
iif
e
w
Be
CEPD-6983-B
CEPD-6984-B
CEPD-6371-A
Use the following se
encountered.
1. TEST EQUIPMENT REQUI
Motorola Model T1
Motorola Model S10
Adapter Cable
Motorola Model TE
UHF type T connect
Motorola Model Tl
Motorola Model S10
2. ‘EXTENDER’? OPERATION
To check for proper
with the r-f carrier sig
STD-REJECT switch is
the switch is in the EXT
a Gonnectithe unto ul"
b. Connect the r-f sig
c. Place the EXTEND-
d. With the pulse gene
described in the Receive
(or uv).
e. Increase the r-f sig
f. Set the pulse gener
reduced back to 20 db q
Place the EXTEND-
generator to again prod
within 10 db of the norm
ope O1rceneck for proper
pulse generator as desc
tion. While slowly incr
audio output. At one poi
point at which the autom
abling should occur betw
h. If the "Extender" o
SERVICING paragraph.
llowing p
radio set}
Bc
e “sampl
THEORY
er these q
eric ULty
in the pul
xtender'' UTEP 2
d pulse a
dividual §
or schem
STEP 4
to indicate
onnect the
D positio
"Extender'' Servicing Procedure
Motorola No. EPD-6982-A
a!
PARTS LIST
TLN6480AS 455 KC IF Board (30 KC)
TLN6480AW 455 KC IF Board (60 KC EPD-7610-O
REFERENCE | MOTOROLA
SYMBOL PART NO. DESCRIPTION
CAPACITOR, fixed: uuf; 500 v;
unl. stated
0. 1 uf +80-20%; 25 v
C43, 44, 45, 46] 21C82372C01
51, 54, 55, 59,
76
C47, 52, 58, 61
C48
C49, 69, 72
21C82428B03
21C82187B17
21D82428B 12
21R410089
21K837745
21D82428B02
21082372C02
", 01 uf +70-30%; 100 v; X5V9
820 410%
.01 uf +70-30%; 100 v; X5U9
27 10%; NPO
820 410%
. 01 uf +70-30%; 100 v; X5U9
0.2 uf +80-20%; 25 v
Woy 0 Sy. 15
C64 21K859178 270 5%; 300 v 30 kc
cé5 21K840049 800 45%; 300 v 30 kc
pr21K859945 390 +5% 60 kc
C66 21K847601 1000 +5% 30 ke
pr21K864736 1300 £5% * 60 kc
Cé7 21D82204B05] 82 45%; N2200
C68 21K859773 2500 +5%
c71 21C82187B05]} 3300 +10%; 100 v
C77 8K834384 0.25 uf +20%; 200 v
SEMICONDUCTOR DEVICE,
diode: (SEE NOTE)
germanium
germanium
CR2, 3
CR4, 5
48C82178A04
480855216
COIL, discriminator:
455 kc; YEL; incl. 1K867236
CORE, tuning
choke: 2 mh; sleeved
choke: 0.62 mh; sleeved
L12 24B82619C02
L13
L14, 15, 16
24V80900A74
24V80900A61
TRANSISTOR, (SEE NOTE)
P-N-P; type M9003
N-P-N; type M4590
P-N-P; type M4605
Q10, 12
Qll, 13
48R 869003
48R 134590
48R 134605
RESISTOR, fixed: 410%; 1/4 w;
unl. stated
6K 129433 5.6K
6K129432 820
6K129752 270
6K127801 470
6K127802 1K
6K128904
6K129231
6K127803
18K
3.3K
1.5K
6B 127800 220
6K129230 12K
6K 129232 SS
6K129146 150K
6K129668 10K +5%; 30 ke
br6K 129669 4, 7K 45%; 60 ke
6K129146 150K 30 ke
br 6K129144 68K 60 kc
TRANSFORMER, discriminator:
BLK; incl. 1K867236 CORE,
tuning: 30 kc
BLU; incl. 1K867236 CORE,
tuning: 60 kc
24B82619C04
br24B82619C03
NON-REFERENCED ITEMS
1V80715A58 | 455 kc Printed Circuit Board
26B82679C01| SHIELD, coil: usedonL12 & T5
NOTE:
Replacement transistors and diodes must be ordered by
Motorola part number only for optimum performance,
CEPD-6983-B
CEPD-6984-B
CEPD-6371-A
“EXTENDER”? SERVICING AIDS
Use the following servicing information if improper operation of the ''Extender" circuitry is
encountered.
1. TEST EQUIPMENT REQUIRED (or equivalent)
Motorola Model T1034B FM Signal Generator
Motorola Model S1056A-9A or TU546 Series Portable Test Set (A Motorola Model TKN6025A
Adapter Cable must be used with the test set for ''Motrac" receivers.)
Motorola Model TEK-21 Pulse Generator (no equivalent)
UHF type T connector and cable (supplied with TEK-21 Pulse Generator)
Motorola Model T1014B or T1015A Oscilloscope
Motorola Model S1052B or S1063A DC Multimeter
2. “EXTENDER”? OPERATIONAL CHECK
To check for proper ''Extender"' operation, noise pulses must be coupled into the receiver along
with the r-f carrier signal. These pulses will degrade the receiver sensitivity when the EXTEND-
STD-REJECT switch is in the STD position. However, the noise pulses will have little effect when
the switch is in the EXTEND position.
a. Connect the uhf ''T'' connector to the radio set antenna connector.
b. Connect the r-f signal generator and the pulse generator to the ''T" connector.
c. Place the EXTEND-STD-REJECT switch in the STD position.
d. With the pulse generator OFF, adjust the r-f signal generator to produce 20 db quieting as
described in the Receiver Alignment Procedure. Note the reading on the signal generator in dbm
(or uv).
e. Increase the r-f signal generator output by 50 db above the 20 db quieting level obtained in step d.
f. Set the pulse generator in the HI position and adjust the LEVEL control until the quieting level is
reduced back to 20 db quieting.
Example:
Normal 20 db quieting -118 dbm
(.27 microvolt)
20 db quieting degraded 50 db -68 dbm
(85 microvolts)
Place the EXTEND-STD-REJECT switch in the EXTEND position and re-adjust the r-f signal
generator to again produce 20 db quieting. The 20 db quieting level obtained in this manner should be
within 10 db of the normal 20 db quieting level.
Example:
een a -118 dbm
(.27 microvolt)
-118 to -108 dbm
(.27 to .89 microvolt)
Normal 20 db quieting
20 db quieting (Noise on - switch
in EXTEND position)
g- To check for proper operation of the ''Extender"' automatic sensitivity control circuitry, leave the
pulse generator as described in step f. Place the EXTEND-STD-REJECT switch inthe EXTEND posi-
tion. While slowly increasing the r-f signal generator input from 20 db quieting, listen to the receiver
audio output. At one point, a definite increase in noise level will be heard in the speaker. This is the
point at which the automatic sensitivity circuit has disabled the "Extender" channel. The point of dis-
abling should occur between 100 and 500 microvolts of signal input.
h. If the "Extender" operation is not as described in this section, refer to the "EXTENDER"
SERVICING paragraph.
3. “EXTENDER”? SERVICING
a. ''Extender'' RF Section
To determine if the r-f stages are operating properly, ee the following procedure.
(1) Connect a uhf ''T'' connector to the antenna connector on the radio set.
(2) Connect the signal generator to one end of the 'T' connector.
(3) Connect the portable test set to the receiver metering socket.
(4) Set the signal generator for an output of 100 microvolts at the ''sampling" frequency. To
determine the proper ''sampling'" frequency, refer to the table in the THEORY OF OPERATION
section. Set the test set to meter position 3. The meter reading under these conditions should read
4 to 6 microamperes. If a correct reading is obtained, the ''Extender" circuitry up to the output of
the third r-f amplifier is operating correctly and service is required in the pulse circuitry. Proceed
to paragraph b.
(5) Ifa correct reading on position 3 as described in step (4) cannot be obtained, recheck the
"Extender" channel alignment at outlined in Receiver Alignment Procedure For ''Extender'! Models.
If a correct reading still cannot be obtained, check the individual r-f stage d-c voltages and compare
them to the printed circuit board detail or schematic diagram to isolate the defective stage. RF
stage gain measurements also may be taken to locate the defective stage. Refer to the AVERAGE
STAGE MEASUREMENTS (located on the reverse side of the alignment procedure).
b. '"'Extender'' Pulse Amplifier Section
(1) If the "Extender" r-f section checks out properly but the "Extender" unit fails to operate as
described in the ''Extender'' operational check, the pulse detector and pulse amplifier circuitry must
be checked. The procedure for servicing these circuits is to make individual stage d-c voltage
measurements and compare them to the printed circuit board details or schematic diagram. This
will locate the defective stage in most cases. If voltage checks fail to indicate the defective stage,
waveforms can be viewed at various points in the circuit.
(2) To observe circuit waveforms:
(a) Turn the signal generator output all the way down and connect the pulse generator to the
other end of the ''T'' connector.
(b) Set the pulse generator to the HI position.
(c) Place the EXTEND-STD-REJECT switch in the EXTEND position and compare the
waveform display with those shown in the waveform chart.
* VOLTAGES MEASURED WITH SWITCH
IN EXTEND POSITION.
RF AMPLEIS
@so1—
INPUT
Q906
PULSE! AMPL-3
a907
*OveE
OUTPUT
STEP 6 STEPS STEP 4
PULSE WAVEFORM
STEP| TEST POINT
DETECTOR
COLLECTOR
PULSE AMPL-i
*
ALSO Q905 COLLECTOR (SAME ELECTRICAL POINT)
PULSE AMPL-2
RF AMPL.-2 4 RF AMPL.
Q902 pe Bop 00 he 0 ke)
* . SEE :
9.8V,
5 SD ea Ea Sermon gigas
STEP 3 STEP 2 STEP 1
TEST POINT PULSE WAVEFORM
Q9s07
5 PULSE AMPL-3/ 4.0V
BASE
—
wm
Q3s07
6 PULSE AMPL-3/ 6.0V
COLLECTOR
TEST POINTS ON R.F. DECK
Qso2
RF AMPL-2
EMITTER
"Extender'' Servicing Procedure
Motorola No. EPD-6982-A
REPETITION RATE OF ALL PULSES SHOWN IS 40KC
(PULSE GENERATOR TEK- 21 IN “HI” POSITION) ; 31
<
A 4a Dl)
J Pith, ab
BEPD-6005-O (CE1956U & CE1956V)
J 404
TRANSMITTER
METERING Z 4104
HARMONIC
FILTER
Yi0i & Y4102
TRANSMITTER
CONTROL T204
CRYSTALS POWER
TRANSFORMER
$104
HI-LO SWITCH POWER
Sle
TRANSISTORS
T204 Q201, Q202
POWER ETC
TRANSFORMER :
F202
POWER
SUPPLY
TRANSISTORS TBI
Q 201, Q202
ETC. Ti4
AUDIO
S201 TRANSFORMER
NETTING
SWITCH Yi & Y2
RECEIVER
CONTROL
ey CEE: CRYSTALS
RECEIVE
RELAY Z4
455KC FILTER
&
Ji | Q20
RECEIVER
METERING W]
£12 V "'Motrac"' Radio Set
Motorola No. BEPD-6005-O
Miscellaneous Parts Location Detail
33
BEPD-6005-O (CE1956U & CE1956V)
J404
TRANSMITTER Ses
METERING 1.D.C. Z 104
HARMONIC
FILTER
YiOi & Y102 TBIO1
TRANSMITTER
CONTROL oo4 T204
CRYSTALS POWER
TRANSFORMER
S104 —| | oe Lane
HI-LO SWITCH os = —~) 1 : : i a PD | POWER
== TRANSISTORS TRANSISTORS
T204 m Q201, Q202 Q201, Q202
POWER ETC. ETC.
TRANSFORMER
L203 F202
SUPPLY
DIET: L204 eo. mm T14
2733 ee. = 7 TRANSFORMER
NET a
SWITCH J20! oe Yi & Y2
@ 40 ‘@Lk RECEIVER
K201 ee ® BBS CONTROL
TRANSMIT- J404 4 | ieee ee CRYSTALS
RECEIVE ANTENNA —————_.." |
RELAY RECEPTACLE ' Z4
ANTENNA J402 &
J{ RELAY © Q20
RECEIVER
eae TOP VIEW BOTTOM VIEW
£12 V '"Motrac'"' Radio Set
Miscellaneous Parts Location Detail
Motorola No. BEPD-6005-O
33
BEPD-6007-O0 (CE1956M & CE1956N)
J104
Y101 &
Y102
S104
HI-LO
SWITCH T201
T20i——
K204
P202 TRANSMIT-
RECEIVE
P201 RELAY
J204 TB201
J202
TBI
J4
T14
yi &Y2
: Q20
£6/12 V ''Motrac'! Radio Set
Motorola No. BEPD-6007-O
Miscellaneous Parts Location Detail
35
!
ey — Le =
5 a ae uh anes aa sry eats 7
BEPD-6007-O (CE1956M & CE1956N)
R137
J104 1; DNC.
Y104 &
aa TBIOI
S104
HI-LO L205
SWITCH
TO ig 3 Waa) Vl ir w Y* S20!
fo se | —' Ge | | NETTING
P202 SWITCH
POWER
P201 TRANSISTORS
Q201 TO Q208
J204
J202 7 a Le a at:
~~ Nhs “ 1% Gas FA LPes Z; w a ; ay)
iT C203
J401
K401
J402 Qi9 Q20
BOTTOM VIEW
T201
K204
TRANSMIT-
RECEIVE
RELAY
TB204
TBI
T1i4
Yi &Y2
+6/12 V "Motrac"! Radio Set
Miscellaneous Parts Location Detail
Motorola No. BEPD-6007-O
35
ad
ms. .
a
-
we
eS ee Te ae
+ Se phe,
PLT,
Phy
—
‘
al
—
a
.
nen
A”
-
ee, en ee ee 0
PARTS LIST (EPD-7285-A)
Top cover (housing)
(Bottom cover (housing)
Front panel
Power supply radiator
Transmitter radiator
Transistor mounting plate
Mica insulator
Plastic shoulder washer
Lockscrew: 6-32 x 3/8"
Lockscrew: 6-32 x 5/16"
Heat sink cover
Screw: 6-32x3/8"' "Phillips"
Screw: 10-32x1/2" "Phillips"'
Screw: 10-32x5/8"' "Phillips"
Screw: 6-32 x 7/8" "Phillips"
Screw: special purpose
15C 852668
15D852664
TGN6002A
or TGN6034A
15D82215A01
or 15D82215A03
15B867111
or 15B865665
or 15K868761
or 15K868702
64A82344A01
14A82343A01
4A82345A01
Soo Ziow
So1223 18
15D82215A05
3S131440
38131269
Shor SLA 7)
35132401
3A857308
All models
All models
All models except 6/12 "Extender"!
models
For 6/12 volt "Extender"! models
For 25 w, 30 w, and 50 w models
For 60 w, 80 w, and 100 w models
For 30 w, and 50 w models
For 25 w models
For 100 w models
For 60 w and 80 w models
All models
All models
All models
All models
All models
All models
All models
All models
All models
All models
All models
Heat Sink and Housing Detail
Motorola No. EPD-7169-A
Ou.
AEPD-2440-O
AEPD-5375-O (MC6024)
AEPD-5006-0O (CE1777)
OSCILLATOR FREQUENCY ADJUSTMENT
oscillator ''on-frequency'"! is the only oscillator adjustment necessary.
pane OllOWS:
wc OTE
d Method:
Ren eee
oe the frequency monitor as described in the frequency monitor instruction
Place the monitor antenna within a few feet of the transmitter.
game selected channel crystal into the socket and set MON. CHANNEL
mee TOR to corresponding position. Follow standard monitoring procedure.
r__|C101 for zero reading on the monitor CARRIER FREQUENCY meter
ing tool A). For two-frequency models adjust C144 also (F1l-F2
in corresponding position). Tune transmitter to the highest used fre-
mg OF most used frequency on two-frequency models.
f sfetting the transmitter "on-frequency'' remove the transmitter control
The frequency monitor should indicate no transmitter output. Re-
rystal and proceed with alignment.
tite Method: This method may be used only when the transmitter and
eee y y
oy _¢r frequencies are identical.
iegieceiver or check for proper receiver alignment by transmitting the
mmm cY Normally received to produce 0 ua reading on the discriminator
hg (position 4 of test set).
Mnetting switch located in the power supply. This will permit the trans-
Maiato operate through the receiver. Zero ua should still be registered at
meee 4 of test set.
Soeemanit GeViation occurs, adjust C101 for 0 ua reading. For two-frequency
tions, adjust C144 for 0 ua reading also (F1-F2 switch and transmitted
orresponding).
FINAL METER READINGS
smitter is aligned or tested, final meter readings should be made and entered
en in the table below are minimum except PA which is maximum. DO NOT ex-
iven for the PA current. This is the maximum plate current to which the unit
ed. Multiply the microampere scale reading by 5000 to obtain actual PA plate
amperes.
gh 6 are purely relative and do not give actual current or voltage measurement.
PA
Plate Plate
Current | Voltage
Doubler
Driver
tads same as position 1; do not use for power output.
Transmitter Alignment Procedure
Motorola No. EPD-5058-E
a
AEPD-2440-O0
AEPD-5375-O (MC6024)
AEPD-5006-O0 (CE1777)
:
TRANSMITTER PRE-ALIGNMENT NOTES
EXCERPTS FROM FCC REGULATIONS
FCC regulations state that: 1
1. Radio transmitters may be tuned or adjusted only by persons holding a Ist or 2nd class commer-
cial radiotelephone operator's license or by personnel working under their immediate supervision.
2. The r-f power output of a radio transmitter shall be no more than that required for satisfactory
technical operation considering the area to be covered and the local conditions.
Frequency and deviation of a transmitter must be checked before it is placed in service and re-
checked once each year thereafter.
ies)
TEST EQUIPMENT REQUIRED
1. Motorola Model S1056A-9A or TU546 Series Portable Test Set with a Motorola Model TKN6025A
Adapter Cable (available on separate order). A 0-50 microampere meter with 20, 000 ohms
equivalent series resistance may be used if a test set is not available.
Motorola Model TLN6046A or TLN6376A Tuning Tool Kit.
3. Motorola Model P-7208 Wattmeter Dummy Load (P-7208 Wattmeter Dummy Load used for 30 &
50 w operation only) or RF wattmeter.
4. Motorola Model T1012A Power Supply (or equivalent).
w
HOW TO SET UP THE PORTABLE TEST SET
Set function selector switch to XMTR. position.
Place the oscillator and meter reversing switch in the OFF position.
Connect the 20-pin meter cable plug to the test set; connect the adapter cable to the cable coming
from the test set; connect the other end of the adapter cable to the transmitter metering socket.
When the test set is not being used, disconnect the 20-pin metering cable to conserve internal
battery life. The plug on the cable acts as an on-off switch completing the battery circuit.
WN ke
HOW TO KEY THE TRANSMITTER
Key the transmitter with the XMTR. ON switch on the test set or key and modulate the transmitter
with a microphone plugged into the test set or radio set control head.
CAUTION
Do not key the transmitter for more than a few seconds
at a time until it is properly tuned. Plate current is
excessive in untuned stages and may cause damage.
Turn on the transmitter for brief periods while reading
the meter and making the adjustments.
CRYSTAL FREQUENCY CALCULATION
a fc + carrier freq. in mc
xtal freq. in mc-pf, = Ta fenown)
“IDC”? CONTROL SETTING
(Transmitter Deviation)
Refer to the reverse side of the transmitter alignment chart for setting of the IDC control.
PRELIMINARY ADJUSTMENTS
1. Connect the dummy load or r-f wattmeter to the front panel antenna receptacle.
2. Place the HI-LO switch on the transmitter in the LO position.
3. Turn the equipment on and allow at least 45 seconds for warm-up.
C136
PA. PLATE
LiO7
ANT COUPLING
Ci38
ANT TRIMMER
HARMONIC FILTER
Z4104 MTG. SCREW
METERING SOCKET
HI-LO
SWITCH
DOUBLER DRIVER
PLATE
4ST
DOUBLER PLATE
Ti TRIPLER GRID
TRIPLER PLATE
T2 2ND DOUBLER GRID
TRIPLER PLATE
2ND. DOUBLER GRID-T2
{ST DOUBLER PLATE
TRIPLER GRID-T1
¥3A09 SIKL
SNINUYA
ANOKA waLwsr
34¥"340 10N OG
RF
DO NOT
EXCEED
140 MA
for 30
Watt
XMTR.
DO NOT
EXCEED
130 MA
for 50
Watt
XMTR.
DO NOT
EXCEED
240 MA
for 100
Watt
XMTR.
STAGE AND TUNING PROCEDURE
Switch HI-LO power switch to LO power position. In LO power position
white dot is not visible.
1ST DOUBLER PLATE -- 1ST TRIPLER GRID, Use hex end of tuning tool A.
Tune slugs of » bottom first, then top. Tune for peak meter reading.
Repeak both slugs.
1ST TRIPLER PLATE -- 2ND DOUBLER GRID, Same tool a's in step 2. Tune
slugs of [2], top first, then bottom. Tune for peak; then repeak,.
2ND DOUBLER PLATE -- PA GRID. Use slotted end of tool B. Tune driver
plate (L103) for peak. Tune final grid (L104) for peak. Successively peak
driver plate and final grid until a maximum is obtained.
PA PLATE. Decouple by turning the COUPLING clockwise and adjust the
ANT trimmer for minimum plate current reading on the test set meter.
Adjust PA PLATE for minimum plate current reading on the test set meter.
Switch the HI-LO switch to the HI position. Repeat steps 4 and 5.
RF OUTPUT. Three methods can be used, wattmeter, field strength meter
or loading into the antenna,
Wattmeter method: Increase the COUPLING until the watt-
meter shows an indication, Adjust the ANT trimmer for a maximum power
output on the wattmeter. Dip the PA PLATE. Increase the COUPLING until
rated power output is reached. Tune the ANT trimmer for a maximum.
Re-dip the PA PLATE and adjust the COUPLING for maximum power output.
PA CURRENT SHOULD NOT EXCEED values at left.
Field Strength Meter method: Increase the COUPLING until
the field strength meter shows an indication. Adjust the ANT trimmer for a
maximum indication on the field strength meter. Dip the PA PLATE.
Increase the COUPLING until a maximum meter indication is reached without
exceeding current at left. Note that the maximum power output may be ob-
tained without reaching maximum PA current.
Loading into antenna method: Increase the COUPLING to ob-
tain an increase in PA reading. Tune the ANT trimmer for a maximum PA
current on the test set meter. Re-dip the PA current for a minimum reading.
Increase the COUPLING until a meter indication approaching maximum PA
current is reached, Re-tune the ANT trimmer for a maximum PA current
as read on the test set meter. Re-tune the PA PLATE for minimum (this
will be very slight). Adjust the COUPLING until the PA current is
140 ma or less, for 30 watt transmitters; 130 ma or less for 50 watt trans-
mitters or 240 ma or less, for 100 watt transmitters.
When loading into an antenna it is advisable to use a field strength meter
to determine the power output. Maximum power output may be reached
without reaching maximum plate current.
OSCILLATOR, FCC regulations require a periodic frequency check. If the
check is due at this time follow the procedure at the right hand side of this
sheet; OTHERWISE NO ADJUSTMENT SHOULD BE MADE,
TUNING TOOLS
A
eeaessors © {Sd ©
B
66n863627 _—————— | ry
is)
OSCILLATOR FREQUENCY ADJUSTMENT
Setting the oscillator "'on-frequency"' is the only oscillator adjustment necessary.
Do this as follows:
1. Standard Method:
a. Set up the frequency monitor as described in the frequency monitor instruction
manual. Place the monitor antenna within a few feet of the transmitter.
b Plug the selected channel crystal into the socket and set MON. CHANNEL
SELECTOR to corresponding position. Follow standard monitoring procedure
c. Adjust C101 for zero reading on the monitor CARRIER FREQUENCY meter
(use tuning tool A). For two-frequency models adjust C144 also (F1-F2
switch in corresponding position). Tune transmitter to the highest used fre-
quency or most used frequency on two-frequency models.
d. After setting the transmitter ''on-frequency"! remove the transmitter control
crystal. The frequency monitor should indicate no transmitter output. Re-
place crystal and proceed with alignment.
2. Alternate Method: This method may be used only when the transmitter and
receiver frequencies are identical.
a. Align receiver or check for proper receiver alignment by tran itting the
frequency normally received to produce 0 ua reading on the discri
metering (position 4 of test set).
b. Press netting switch located in the power supply. This will permit the trans-
mitter to operate through the receiver. Zero ua should still be registered at
position 4 of test set.
c. If meter deviation occurs, adjust C101 for 0 ua reading. For two-f equency
applications, adjust C144 for 0 ua reading also (F1-F2 switch and transmitted
Signal corresponding).
ninator
FINAL METER READINGS
Each time a transmitter is aligned or tested, final meter readings should be made and entered
in a logbook.
All readings given in the table below are minimum except PA which is maximum. DO NOT ex-
ceed the value given for the PA current. This is the maximum plate current to which the unit
can be safely tuned. Multiply the microampere scale reading by 5000 to obtain actual PA plate
current in milliamperes.
Readings 1 through 6 are purely relative and do not give actual current or voltage measurement.
Doubler
Driver
Grid
CIRCUIT
METERED
SWITCH
POSIT ION*
METER
READING
*PO position reads same as position 1; do not use for power output.
Transmitter Alignment Procedure
Motorola No. EPD-5058-E
39
MEASUREMENT OF DEVIATION
fe means of measuring transmitter deviation is to use the Motorola T1020A
and Deviation Meter. This unit, properly used, permits the accurate measure-
ransmitter deviation from peak-reading meter, which is unaffected by waveform.
ot required with this instrument. With this device, the transmitter deviation can
tely even with voice modulation.
LINE LEVELS
n level in the system still appears to be too low after setting deviation as indicated
rophone,.
yrocedure will insure that the transmitter will comply with FCC requirements for
> of the correct deviation setting can not be overemphasized. Optimum system
ids accurate deviation setting, both from the standpoint that overdeviation will
ser on the adjacent channel, and underdeviation may reduce system range.
|
:
.
|
(OF8LHD 0/4) O-Sg6h-adadAV
(OP8THO 0/4) O-FSSP-ddaVv
(OF81HD 0/4) O-16SF-addaVv
AEPD-6479-O (MC6923)
AEPD-2440-O
OPERATION REFER TO PROCEDURE EPD-6392
=| STAGE MEASUREMENTS WITH RADIO SET PROPERLY ADJUSTED
PEO METER TEST SET
TO FREQUENCY | POSITION METER READING
a a
15 >ua
>
DD)
ct
fo)
13)
s)
%)
Oo
SA
ro)
ro)
°
rej
=)
o
ro)
ct
o)
Qu
4
=
; | Ist RF (Q1) Carrier Freq. l 10 ua
=
20 DB Quieting (Par. E.)
| Base __|ist 455 ke
ae 0.455 1 10
STAGE MEASUREMENT NOTES
|jrements made with signal generator tuned to the required frequency.
ijrements, except antenna input, taken with a 50 ohm terminated cable
{03 uf capacitor in series.
Receiver Alignment Procedure
Motorola No. EPD-6480-B
AN
—
“IDC” ADJUSTMENT (PREFERRED METHOD USING OSCILLOSCOPE)
1. INTRODUCTION
Accuracy of test equipment is of prime importance to any user of radio communications equipment;
but of equal importance is a knowledge of the characteristics of the measuring equipment under various
conditions. The Motorola T1100A Series FM Station Monitor is the leader in the field with respect to
sensitivity, accuracy under conditions of variation in r-f signal level, line voltage, and environmental
conditions. In common with most other meters it has the characteristic of responding differently to
different wave shapes. Therefore, the use of most present-day deviation meters can lead to confusion
and errors in deviation setting, if the pitfalls are unknown or disregarded.
The ideal deviation indicator would be one which would respond instantaneously to the peak value
of the modulation deviation regardless of waveform. The only device which meets all these require-
ments is an oscilloscope. It responds instantaneously and it shows the peak value of any waveform,
no matter how complex. Properly calibrated, an oscilloscope is the most accurate and reliable in-
strument for measuring and setting transmitter deviation.
The oscilloscope must be used in conjunction with a receiver which has a stable discriminator
characteristic, since the oscilloscope displays the demodulated signal. In addition to the oscilloscope
and receiver, a means to accurately calibrate the system is required. The Motorola monitor fills
these requirements, since it provides both a sensitive receiver with the proper discriminator char-
acteristic and a reliable means of calibrating the oscilloscope. It has convenient terminals on the
front panel for connection of the oscilloscope. Also, the Motorola FM Station monitor has two modu-
lation meter scales, 0-20 kc for wide-band systems, and 0-10 ke for split-channel systems.
Split-channel conversion kits are available for modification of older models. When converted,
the older models have convenient oscilloscope terminals and can be more accurate measurement
devices for such systems.
2 TEST EQUIPMENT REQUIRED
a. Motorola T1100A Series FM Station Monitor (or equivalent)
b. Motorola Model S1051B, S1051BR, S1053A or S1053AR Transistorized AC Voltmeter
(or equivalent)
c. Motorola Model TEK-1A Transistorized Tone Generator, 1000 cps (or equivalent)
d. Motorola Model T1014B Precision Wide Band Oscilloscope or Motorola Model T1015A
General Purpose Oscilloscope (or equivalent)
e. Motorola Model S1056A-9A or TU546 Series Portable Test Set with a Motorola Model
TKN6025A Adapter Cable (required for ''Private-Line'' models only)
3. OSCILLOSCOPE CALIBRATION
The first step in the measurement of transmitter deviation is to calibrate the oscilloscope.
This can be done by using the transmitter which is to be measured.
Proceed as follows:
a. Remove the ''Vibrasender" resonant reed in dual squelch "'Private- Line" models.
b. Connect the oscilloscope to the monitor oscilloscope terminals end set up the monitor controls
in accordance with the monitor instruction manual.
c. Turn the IDC control on the transmitter chassis to the full clockwise position.
IDC Adjustment Procedure
Motorola No. EPD-6478-B
40
d. Feed a 1000 cps test tone into the transmitter audio input (at mike receptacle). Modulate the
transmitter with this tone so adjusted that the deviation as read on the FM monitor deviation meter
is 2 kc (6 kc in a wide-band system), An audio oscillator must be used for generation of this tone,
since a sinusoidal waveform is very important. Motorola TEK-1A Transistorized Tone Gener-
ator is excellent for this purpose. N
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e. Adjust the vertical gain of the oscilloscope so that the total recovered audio pattern occupies some
convenient height, e.g., four small squares (12 squares in a wide-band system). The split-channel
condition is shown in figure l, |
Figure 1,
Oscilloscope Calibration for Split-Channel Transmitter
Having calibrated the oscilloscope, there is no further need for the modulation deviation meter.
Ignore its reading from this point on. It has already performed its important function of calibrating
the oscilloscope, j
With the oscilloscope calibrated as indicated, a recovered signal which occupies 10 squares
(peak-to-peak) is equivalent to +5 kc deviation. For wide-band systems, a recovered signal occupying
30 squares (peak-to-peak) is equivalent to +15 kc deviation,
4. MEASUREMENT AND SETTING OF TRANSMITTER DEVIATION
Once the oscilloscope has been calibrated the transmitter deviation can be properly adjusted by
the following method, |
a. Carrier Squelch Models
(1) Adjust the 1000 cps input signal to 1 volt. This should drive the IDC circuit to the, full clip.
See figure 2,
Figure Ge
5 KC Peak Deviation as seen on the Oscilloscope
(NOTE: Waveform is clipped fully)
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(2) With this input signal level, adjust the IDC control on the transmitter to provide a 10-square
peak-to-peak recovered signal on the oscilloscope. This is equivalent to +5 kc deviation as shown in
figure 2, A wide-
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