Document text
ENCY _ ELECTRONICS INC.
INSTRUCTION & SERVICE
MANUAL
ann ene:
lliediet
nk le
ahs ciate
iietetes
hicroscum wither
UHF-FM REPEATER \
MODEL MICRO COM U/Or
UAPorM REPEATER
700!1- 4001-100 PRINTED IN U.S.A, PRICE $12.50
——————
UNPACKING
Check the carton and packing material carefully for the following
items:
- Repeater unit
Microphone and Connector
- Owner's Service Manual
= Warranty, Card
Sl ell oeell oe
I
To be filled out and returned to:
REGENCY COMMUNICATIONS, INC.
A subsidiary of Regency Electronics, Inc.
1227 South Patrick Drive
Satellite Beach, Florida 32937
MICRO-COM U1OR SERVICE MANUAL —
CONTENTS
SECTION 1 GENERAL INFORMATION
l-l Description
l-2 Specifications
1-3 Equipment Supplied
1-4 Equipment Not Supplied
1-5 Installation
1-6 ‘%peration
1-7 Crystal Specifications
1-8 Crystal Installation
1-9 Crystal Heating Detail
1-10 Crystal Location and Adjustment Diagram
SECTION 2 REPEATER SYSTEM DESCRIPTION
2-1 Description
2-2 Repeater System Block Diagram
SECTION 3 RECEIVER
3-1 Receiver Circuit Description
3-2 Receiver Voltages
3-3 Receiver Block Diagram
3-4 Receiver Board Top View
3-5 Receiver Board Bottom View
3-6 Receiver Schematic
3-7 Receiver Alignment
SECTION 4 TRANSMITTER
4-1 Transmitter Circuit Description
4-2 Transmitter Voltages
4-3 Transmitter Block Diagram
4-4 Transmitter Board Top View
4-5 Transmitter Board Bottom View
4-6 Transmitter Schematic
4-7 Transmitter Tuning
SECTION 5 POWER SUPPLY
Regulated Power Supply Circuit Description
Power Supply Voltages
Power Supply Board Top and Bottom Views
ret
WN FE
SECTION 6
SECTION 6A
6A-1
6A~2
6A-3
6A-4
6A~5
6A-6
6A~7
6A-8
6A-9
6A-10
SECTION 7
Pe eo
Noor hWN FH
MA-90 TONE ENCODER-DECODER, AND MA-95 TONE ENCODER
General Information
MA-90 Circuit Description
MA-95 Circuit Description
MA-90 Schematic and Board Views
MA-95 Schematic and Board Views
MA-116 TONE ENCODER-DECODER & MA~121 ENCODER
General Information
MA-116 Encoder=-Decoder Circuit Description
MA-121 Encoder Circuit Description
MA-116 & MA=-121 Tone Setting Instructions
Adjustment Procedure (Setting Tone Receive Threshold
on MA=-116)
Adjustment Procedure (Setting Tone Modulation Deviation
on MA-121) |
Block Diagram
Schematic
CTCSS Tone Board Top & Bottom View
MA-116 & MA-121 Setup Adjustment Locations, Top View
REPEATER CONTROL SYSTEM
Repeater Control Board
Audio Paths
Transmitter Activation By Noise Squelch
Transmitter Activation By CTCSS (TONE SQUELCH)
Operation By Local Microphone, PTT Function
Tone Monitoring Provisions
Three Minute Timer, Drop-Out Delay, Time-Out Warning
Oscillator
Repeater Control Board Top View
Repeater Control Board Bottom View
Repeater Interconnection Schematic, Including Power
Supply and Control Board
Auxiliary Tone Board Top View
Auxiliary Tone Board Bottom View
Auxiliary Tone Board Schematic
LED Board Top and Bottom Views
Repeater Control Board and Auxiliary Tone Board
Voltages
SECTION 8
oon nuk WD bE
SECTION 9
REPEATER SETUP INSTRUCTIONS
Preparation for Noise Squelch Operation
Audio Level Setting, Noise Squelch
Preparation for Tone Squelch Operation
Audio Level Setting, Tone Squelch Operation
Squelch Control Setting
Final Listening Tests of Audio Level Setting
Setup Adjustment Locations, Top View
Setup Adjustment Locations, Bottom View
Setup Adjustment Locations, Rear View
ANTENNA SYSTEM REQUIREMENTS AND TESTS
Isolation Requirements of External Antenna Systems
and Duplexers
Special Repeater Tests
Test for Transmitter-Receiver Interference Within the
Repeater
Test for Transmitter-Receiver Interference in the
Antenna System
Test for Transmitter-Receiver Interference Within the
Repeater Diagram
Signal Injection Fixture Diagram
Calibration of Signal Injection Fixture Diagram
Test for Transmitter-Receiver Interference Within the
Antenna System Diagram
SECTION 10 PARTS LIST
10-1
10-2
10-3
10-4
10-5
10-6
10-7
10-8
10-9
Receiver Board
Transmitter Board
LED Board
Power Supply Board
Control Board
Auxiliary Tone Board
Tone Encoder-Decoder Board
Tone Encoder Board
Chassis Assembly
10-10 MA-116 & MA-121 Tone Boards
\
<
~ a8 . = . m
k: ow ' 4 ‘es a ~ "Ere =
i ; - / 3 i a *
¥ > — K f
bi - Ds
' a
—
rd «
& . “ +
: - =
outa
~
a
2 F 4
a
]
rs
7
. ~~
+
=
. ' - 7"
»
: & f ‘
¥ * >
LALIT > & Pi
*
“ 4 :
i ice Pad"
4 :
sein 5
y 4 j ;
an
SECTION |
GENERAL INFORMATION
mcu fF SECTION |
79 aes ee!
€
2
‘ Lik aoe aN ne ay sot :
| Worse
RIOR FOOSE ea EE Oe
SECTION 1 GENERAL INFORMATION
1-1 DESCRIPTION
The Regency MICRO-COM U1OR is an FM repeater for use in the
450-470 MHz Land Mobile Communications Band. It is equipped with
facilities which permit local control of the repeater, for use by
a dispatcher and/or for use by maintenance personnel in making
tests on the repeater.
As supplied, the repeatermay be mounted on a desk or shelf.
When equipped with Option MA-109 brackets, it may be mounted in
relay rack structures.
The repeater control system provides for the following func-
tions:
1. Operation of the transmitter by tone squelch or noise
squelch control.
2. Provisions for plugging in up to seven tone squelch fre-
quencies, for use on community repeater systems. Addi-
tional tone squelch frequencies may be added outboard,
if desired.
3. Three minute cutoff timer, with warning tone.
4. Transmitter drop out dalay.
5. Provisions enabling operationof the repeater by a local
operator. These provisions also enable maintenance tech-
nicians to receive and transmit test transmissions using
each of the installed tone squelch frequencies.
The receiver section is certified under Part 15, Subpart c
of the FCC Rules. The transmitter is Type Accepted under the fol-
lowing FCC Rules parts:
21 Demestic Public Radio Services
89 Public Safety Radio Services
91 Industrial Radio Services
93 Land Transportation Radio Services
95 Citizens (Class A) Radio Services
mcu r “|= SECTION lL
1-2 SPECIFICATIONS
RECEIVER
Antenna Impedance. .......---.2---e0e- 5S etat et eenaae siete 50 Ohms
Frequency Ringe. obred. Sool seasnamne: Pay dee cur NA: 450-470 MHz
SeneLtivLeyet sss . HPSS PP SIS. sate ces 3 s .35uV, 12 DB Sinad
.50uV, 20 DB Quieting
.25uv, Carrier Squelch Opening
.25uvV, Tone Squelch Opening
SEOLEGCCLVLEY «io. 6 ws 6 0 2 cis win tele 01s whejeisie cities ~ eles 75 DB @ 25 KHz
Spurious and Image........--screceccreeereecs wolee st 75 DB
Intermodulation Rejection. .....--. cee cece reer ececes 70 DB
Modulation Acceptance.......--- cece eee eee e reece +7.5 KEZ
Frequency Stability............-. +.0C025%, -30°C to +60°C
Audio Response ) Within plus 2 and minus 8 DB
from a standard 6 DB per oc-
tave de-emphasis curve over
the frequency range of 300 to
3000 Hz with a 1,000 Hz ref-
erence frequency
Audio Output Power, Rated
VAIO cic sion olete se.0 sce omens Cope ai biels 4 watts @ 5% distortion
Maximum Audio Output Power...... 5 wetts @ 10% distortion
I.F. System..... atten Double Conversion 10.7 MHz - 455 MHz
Part 15 FCC Certified
TRANSMITTER
Antenna Impedance. ...-....eeee sec ccccrercecccens 50 Ohms
Frequency Range...... seers ceccecccccceccs e 450-470 MHz
mcu r =2= SECTION Il
Power Output le)... 0%. 2, SR ee gle Meats ee ahs 10 Watts (minimum)
P) Output Frequency Stability...... +.00025%, -309C to +60°C
Spurious & Harmonic Rejection. ..........ccececccees 60 DB
Power *Uni C Protection eae te.. eraicreee Temperature Limiting
Power Control Circuit
EMLSSi LON ss". ois oe Sarah avatatet, doses san Ere tate Susieel Todas gta ceatehens eke 16F3
MECFODNONO) sais. Sanyo ettreigiet ns High Impedance Plug-in Ceramic
Modulationeye. eyesore. pret ete ose ta Fate Frequency Modulation with
Automatic Deviation Limiting
Be ALOT cteterete ani et uate Factory Adjusted to +5 KHz (max.)
Audio Frequency Distortion.............. AOI ERE GROEN SRE 10%
PM O@HUN cI NO LSS PIA VEL. ests cto Ste wtarera ai aleres davatars eeslals -60 DB
Audio Frequency Response... From 300 to 3000 Hz, within +1
; and -3 DB of a 6 DB per octave
@ pre-emphasis characteristic as
. referred to the 1,000 Hz level
POWER
Power Requirements....... etodenst st she icles siete WIV eV neG OU LH
Receive Condition....... Peed oaks tehstenoeial ei oisl elerenelaietele -15 amps
ipransmit CONALELOM try retets a seats s bere. Oe Sater eres a et .8 amps
FUSO"OLZeSe. wee Ce eT we eS sate ltl e Seeks ns Ae 2 Amp. 3AG
GENERAL FEATURES
Outside Dimensions (Excluding
Knobs and Connectors)........... Dyer x Lise x Oentoh
Vertical Rack Space
Requirements........... 11%", plus a recommended 8" for
access to controls and connectors
@ Weight. cocaorcestereerseereoeoe ese eee go oeeoeeesee ee SECON 50 FC 1A TOS 12 lbs Mg
mcu r ai- dee SECTION 1
1-3 EQUIPMENT SUPPLIED
1 - Repeater Unit
1 - Test Microphone and Connector
1 - Receive Channel Crystal, installed to customer specified
frequency .
ai Transmit Channel Crystal, installed to customer specified
frequency.
1 - Control Board with connectors to accept three receive
and three transmit CTCSS (Continuous Tone Coded Squelch
System) modules.
1 - Auxiliary Tone Board, to accept four receive and four
transmit CTCSS modules.
1 - cTCSS receive module, installed to customer specified
frequency.
1 - CTCSS transmit module, installed to customer specified
frequency.
Up to six additional CTCSS receive modules and up to six ad-
ditional CTCSS transmit modules, installed per customer spec—
ified frequencies, supplied at extra cost if ordered.
1-4 EQUIPMENT NOT SUPPLIED
Because of the many varied antenna arrangements possible for
repeater use, antennas, antenna connecting cables, and duplexer/
cavity accessories are not supplied as a part of the repeater.
‘Rack mounting adaptors are not supplied as a part of the re-
peater.
1-5 INSTALLATION
Mechanical Mounting
The U1LOR is supplied for mounting on a desk, shelf, or other
flat surface. For those cases where it is desired to mount the
repeater in standard relay racks, mounting brackets are available.
The mounting brackets may be attached to the repeater chassis to
permit the "top" or equipment side to be located in front of the
rack panel surface, or to the rear of the rack panel surface. If
space will permit, the front surface mounting is recommended for
easy access to the technician adjustments.
mcu r -4- SECTION lL
°
In some cases, it is desired that a local operator have ac-
cess to control of the repeater. For these applications, the re-
peater may be mounted on the operator's desk top.
The microphone hang-up clip must be mounted so it is elec-
trically grounded to the metal case of the repeater. .Mountsitsin
a convenient location, accessible to the technician, or the local
Operator (if any).
1-6 OPERATION INSTRUCTIONS FOR LOCAL CONTROL POSITION
The operator at the local control position should realize
that the unit is a repeater, and that it performs repeater func-
tions for various mobiles, independently of the local control op-
erator's actions, unless interrupted by the local operator when
making a transmission over the repeater transmitter.
Volume Control
This control varies the audio volume level to the local loud-
speaker, and should be set to a comfortable listening level. It
has no control over the volume of the repeating function, and it
has no control over the volume of transmissions made over the lo-
cal microphone.
Power Indicator Lamp
A green indicator lamp is located on the front panel. It is
used to show that the power to the repeater unit is "on."
Transmit Indicator Lamp
A red indicator lamp is located on the front panel. When
this lamp glows, it indicates that the repeater transmitter is
turned on. This lamp will glow whether the repeater transmitter
is activated by the local microphone or by a distant mobile.
Tone Squelch Monitoring Function: (For units equipped with
Tone Squelch)
When the microphone is placed in its hang-up hook, the Tone
Squelch System is effective and only signals from stations having
the appropriate tones will be heard in the local loudspeaker.
On shared radio channels, it is considered good manners to
listen in on the channel before transmitting. When the microphone
is removed from the hook, the Tone Squelch circuits are placedin
mcu ¢ 25= SECTION 1
the MONITOR condition, and any signal on the channelwill be heard
regardless of whether it has. the appropriate tone coding.
If the operator attempts to transmit a message by merely
pressing the microphone button while the microphone remains in
the hang-up hook, the tone squelch tone will. not be transmitted,
and. the message will not get through (unless the listening sta-
tion just happens to be in the MONITOR position at the time).
Microphone
A hand-held microphone is supplied with the unit. To trans-—
mit a message, remove the microphone from its hang-up hook, press
the push-to-talk button on the side of the microphone, and speak
into the microphone. The Transmit Indicator will glow to signify
that the transmitter is operating.
‘ults are obtained by holding the microphone about
one inch from the lips, inclined at about a 30 degree angle away
from the face. Speak clearly in anormal tone of voice across
the face of the microphone.
1-7 CRYSTAL SPECIFICATIONS
Miniature plug-in crystals are utilized in both the receiver
and transmitter sections.
The following Regency Part Number crystals are used:
Transmit Crystals: 302-539
Receive Crystals; 302-540
Crystals should be ordered by specifying the above part num-
bers and the exact channel frequency required.
Installation of crystals requires the services of a competent
technician with appropriate test equipment. Instructions for the
necessary adjustments are included in the receiver alignment and
transmitter tuning procedures later in this manual.
1-8 CRYSTAL INSTALLATION
Special care must be taken to install the crystals correctly.
The conduction type crystal heaterwhichis used to warm the crys-
tals at low ambient temperatures relies on having proper physical
contact between the heater element and the crystal for effective
operation. The Crystal Heater Detail, (Figure 1-9) demonstrates
mcu r =-6= SECTION |
C
the correct method of crystal installation. The crystal must be
pressed down into the socket pins far enough for the rim around
the bottom of the crystal to clear the heating element and allow
good contact between the side of the crystal and the element.
mcu r ot Maes SECTION |
HEATING ELEMENT
THERMISTOR
P.C. BOARD
1-9 CRYSTAL HEATING DETAIL
mcu r -8- SECTION |
TRANSMIT CRYSTAL
O
NETTING INDUCTOR
RECEIVE
NETTING GC [)CRYSTAL
INDUCTOR
|-10 CRYSTAL LOCATION AND ADJUSTMENT DIAGRAM
mcu r -9- SECTION |
S.7 Beh re MATa ste A Oe ld eatny i lon 9 J re OR ST 7) ay »\
Sneeeeens Were err 7 ) me er Ve ue
| | eur at Ua tn MY Goad Nir
| im (4h inn ie my ¥ ee a
- g ni en | m , fi ,
| | in! wk, ‘bas es
| ae \previn TmenmaP,
| 6 oe
‘a | | OTe ait i as
; . AO Bae WG wi t aN at it: ie cio
| nc salma daar telah ial ia AE POLED AA ate camera inne } , a
satin titabieiiaie | :
. i i ke
‘ , . pe Pike !
4 : ; ri ; i
| eas - } ; 5
rs 5 :
. . Aya Heat
deena ete eet rate we /
} j E
}
} ae
‘. ; o oer ‘
ae x antoeeonn meetin | we a
Ey a * snort
; ie oe
Le =
‘iy ‘ie Ce
i 4 Lp stags
i} \
bs
as fe
at hn F
‘ Decent ene
. LP Be)
ne i ae on eee
mt , 4 ae
4 ‘ ; ; i }
¥~) 1g ;
- dinates. Pa I ; .
: ' @ .
~ . f a
havlageniiiel | 4
i | |
' ‘ i, }
‘ ferent cnn tien eshalit cian ina ituaninapa inmate ie ,
he er or datas “
; E i
- : j
i
: \
' | A
5 ‘ss M
* 9 44 a :
: & va oe a ray
‘ ~~ =r fe
aes Ge ET RLY i i .
: i ud cuit bruit, p
A ie — —-— : '
) wee ure ed
Fs ‘ war abs oe APRN Ot OE
‘oe twee. we ~ 0 grr) Oni mening, 4 ene ote are 4 etal
7 om
bem dete) tak ghee pt naling aan int demesne mpeg I a A EN sentan cost cencipammmand ears
WAROAIG TwaM TEUMOR OMA, wOTTADGS .
Fe: vn
Hie mya eh A’
SECTION 2
REPEATER SYSTEM DESCRIPTION
mcu rr SECTION 2
ve
@
SECTION 2 REPEATER SYSTEM
2-1 DESCRIPTION
A block diagram of the repeater system is shown in Figure
2-2. The block diagram shows the major functions of the various
portions of the repeater. To make explanation of'the diagram eas-
ier to follow, the operating frequencies have been assumed to be
469.50 MHz receive and 464.50 MHz transmit. This follows the
pattern of frequency assignments in the 450-470 MHz band in the
United States. Mobiles functioning with this system would trans-
mit on 469.50 MHz (so they will be received by -the repeater re-
ceiver) and would receive on 464.50 Muz (so they will "hear" the
repeater transmitter).
As the block diagram shows, signals received on 469.50 are
demodulated by the receiver, and the audio intelligence is sent
to the tone squelch system. If the received Signal has the same
tone squelch frequency as one of the installed tone squelch boards,
the tone squelch system, acting with the repeater control system
turns the transmitter on, and retransmits the original intelli-
gence,
Additionally, as the block diagram shows, an operator at the
repeater location can transmit through the local microphone and
can hear incoming mobiles through the local loudspeaker. Features
within the tone squelch system and the repeater control system
permit the operator at the repeater location to transmit one of
the tone squelch frequencies, and also enable the loudspeaker to
be silent except when a signal with that tone. squelch frequency
is received.
mcu r | oa) SECTION 2
INCOMING SIGNALS OUTGOING SIGNALS
(e.g. 469.500) (¢.g. 464.500)
464.500 MHz
TRANSMITTER
469.500 MHz
RECEIVER
AUDIO FREQUENCIES
REPEATER CONTROL
SYSTEM
TONE SQUELCH
SYSTEM
LOCAL CONTROL
MICROPHONE
LOUDSPEAKER
2-2 REPEATER SYSTEM BLOCK DIAGRAM
mcu r =—e= SECTION 2
mcu r
SECTION 3
RECEIVER
SECTION 3
ara AR Std a a ON | i
Pe aid bd feed 6
- tery: fer
Ne YT wee OC Se ae ee
4 .
:
wn « iy he an
f j a 4 f ian } ‘
a ¥ t ai } ,
4 ‘ ; ull Val
Le.
=
“ ine menos Seep pt wa
~ u : ’
{
ve
‘ath a
4 x 5
yikes sins sy
it DR Gg re aay
¥
f ph
2 i} “4 o
a al
7
’ 7 ed
pit
; ‘
: sO mie: a
iid 5 aE eh :
aii : aa i a fe ey,
ies ee cape
a
:
SECTION 3. RECEIVER
3-1 RECEIVER CIRCUIT DESCRIPTION
The entire receiver is mounted on the receiver circuit board.
The antenna is connected to a 2 Section RF Helical Filter, L109
and L110, which acts as a preselector for incoming signals.
Q105 is a grounded gate, low noise, J-FET amplifier. Its
output is fed through an additional 2 Section Helical Filter, L112
and L113 and delivered to the gate of Q106, a J-FET mixer.
L.O. (Local Oscillator) injection for the J-FET mixer Q106
is a frequency of 10.7 MHz lower than the incoming signal frequen-
cy. It is obtained from a crystal oscillator-multiplier chain,
consisting of Q10l, Q102, Q103, and Q104. Q101 is a crystal os-
cillator, using a third overtone crystal in the 48.8 to 55.7 MHz
range. The output circuit of Q101 oscillator is tuned to the
third harmonic of the crystal frequency, and this harmonic is am-
plified by a buffer-amplifier consisting of Q102 and Q103. Q103
drives Q104, which operates as a frequency tripler, providing the
wanted local oscillator injection frequency. This wanted injec-
tion frequency is separated from various harmonics and subharmon-
ics by the L114 and L115 section of the helical filter and deliv-
ered to the source of the mixer, Q106.
The output of Q106 consists of a 10.7 MHZ IF signal which is
fed to a Six-pole monolithic crystal filter, Consistingvof FLO).
FL102, and FL103. This filter Provides most of the adjacent chan-
nel selectivity of the receiver. The Signal is then amplified by
integrated circuit, IC102, which contains another amplifier for
10.7 MHz, the second mixer circuitry and the second L.o. circuitry,
operating at 10.245 muz.
The 455 KHz output CLpLClLo2 (terminal 5) is coupled through
a tuned circuit to the input of the ceramic filter, FL104. FL104
is a narrow-band filter centered at 455 KHz, and it provides ad-
ditional adjacent channel rejection. The output of FL104 is am-
plified and coupled througha tuned circuit to the input of inte—
grated circuit ICl103. ICl03 is a series of amplifiers providing
approximately 60 DB gain at 455 KHz. Also included in ICl03 is
the limiting circuitry and a quadrature detector circuit. 41123,
connected between terminals 2 and 12 of Ic103, is the adjustable
quadrature coil.
mcu r l SECTION 3
The audio output from IC103 (terminal L) is coupled to the
input of the audio amplifier circuit and to the input of the
noise-operated squelch circuit.
Transistor Q110 is an amplifierwhose frequency response ex-
tends from approximately 4 KHz to 25 KHz. Q110 amplifies the
noise occurring in this frequency range. The noise is coupled to
the base of Ql1ll. Q11l is used as a detector which rectifies the
amplified noise and produces a DC voltage at its collector. When
the DC voltage at the collectorof Ql1l1l is positive and of suffi-
cient value to provide essentially a short circuit between the
base of Q113 and the audio output from the receiver is squelched
(muted). When a signal carrier arrives, the noise input to the
detector (Ql111) is reduced to the point where the DC voltage at
the base of Q112 is no longer sufficient to cause Q112 to conduct.
At this time, Q113 is allowed to conduct normally and the au-
dio ou-pue -. the unit is heard. With the audio preamplifier,
(Q113) operating normally, audio is applied through the volume
control to the input of the audio amplifier, IC104. Q113 supplies
a Signal to the audio amplifier ICl104, which amplifies the audio
to loudspeaker level.
mcu r : ay a SECTION 3
3-2 RECEIVER VOLTAGES
NOTE: All voltages are nominal and are measuredwith a VTVM,
at 13.0 VDC supply voltage.
VOLTAGE DATA
Receiver Transistors:
Emitter Base ‘Collector
Ql01 aba Le. 5 9
Q102 4.2 5.0 9
Q103 0 On? Bae
Q104 0 : 4 -0.15 Sig
Ql105 (FET) 1.7 (Source) 0 (Gate) 9 (Drain)
Q106 (FET) 0.9 (Source 0 (Gate) 9 (Drain)
Q107 (PNP) 8.7 832 520
Ql08 3.6 4.2 8.2
Q109 3.6 4.2 8.2
Q110 1.0 L6G 68
Qlll 2 Bosh 9.1 0 (Unsquelched)
o.1 9.5 9.0(Tight Squelch)
Qui2 0 0 2.6 (Unsquelched)
0 See O(Tight Squelch)
Ql113 bes 2.6 6.4(Unsquelched)
Bef) 0 9.1(Tight Squelch)
Ql1l4 0.4 0.8 13.0 @ 25°C
Ql15 0 0.4 13.0 @ 25°C
Receiver Integrated Circuits:
EoiNO L662) 13 | ee eo ce oeelO) 11 12 13.1
Ic10l 7 1 O. 0 POs Ome Bes 7 ees OF ato se - - = = os
IC102 2,2 ,0.650N6) 2. one OO Base 173 sO = - - - = =
Ic103 4278 3. 2h Lie Set ences GO 0 0.14 - ~ ede a) Wea
Icl04 13.0 - =i) L259 RRO eeOe on 0 0 @) 0 0 ~ Or0 - ~
mcu r ee SECTION 3
10SY
£019)
YOLYNIWINDSIO
“M3LINIT 4
ZH SSb
LAE
y3iNds
/ JINYHID :
TWALSAUD
01 G2
ZH S&Z°O!
1 A a | re
W901 NZ
ZHNGSt ZHW LOI
ZHW LOI
‘\ 601‘80!'2010
g Ua AY
‘90 “OSV
£01‘ ZO!
"10113
ZHA 20!
FOVLIOA
TOULNOD I4V
ZHW CONS
-86be TWLSAYD
TOHLNOD T3NNWHO B
b010 €0!4 2010
dnV
43 Idd w34sne
ZH 6O'ESI
vol
1010
YOLVT1IDSO
3-3 RECEIVER BLOCK DIAGRAM
SECTION 3
mcu_ r
RECEIVER BOARD
: ws ° — so staan ope
or pe ee
A q o ee CG oa
Z ; ay
Eh é é tae XS g “ Crys)
Bes _ oN
2
501-23
3-4 RECEIVER BOARD TOP VIEW
meu r -5- SECTION 3
501-236
RECEIVER BOARD
3-5 RECEIVER BOARD BOTTOM VIEW
SECTION 3
mcu fF
L124
lOOUHY
TP104
®
RI46
2.2K
2,30
an
ok)
OSs SPS952
fa
= IC104
TBABIOS
AUDIO POWER
AMP
8.2 VOLT RIS4 RI57
39
Ww
CRIO4,
IN4738A).CcI6
250
a8
sp$952
riak SQUELCHED
AMP -AU
AU AR [Oh
CcI74
=]
NOTES
aohkwn
ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE ARE OHMS.
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE 4 w.
[-__] DENOTES ADJUSTABLE COMPONENTS.
(CJ DENOTES CIRCUIT JUNCTION POINTS.
HEAVY LINE DENOTES APPARENT SIGNAL FLOW.
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH A
VTVM, SUPPLY VOLTAGE = 13,8 VOC AT INPUT
LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING
CONDITIONS:
u = UNSQUELCHED
Ss
t
SQUELCHED - THRESHOLD
SQUELCHED - TIGHT
3-6 RECEIVER SCHEMATIC
SECTION 3
RECEIVER BOARD 501-236
3-5 RECEIVER BOARD BOTTOM VIEW
mcu r =67 SECTION 3
—— a
LIO6 TPIO3 Li24
evel UUUS IOOUHY
Ol iT IS UHY pie $ ‘
x R123
pale iclo2 # 2 | Sere
2K :
MCI550P =
S cRio3 =
ICIOl ci32 ge C13 db naa oor
¢ t = ‘
10.7 MHZ FILTER MCISSOP a tee =
FLIOL * _Fulo2 FLIO3 10.7 MH: FLIO4 =
ea ea Me) | S| ax) = 455 KHZ FILTER cir | |
—" a | |
aT le 23 Linge = Uae |
220PF :
2) @ ah 362 uny! 3, 100 UHY ee . 4 %
br | ace cise —
47PF L eaPry = 680! |
4 726 143. ci48 ie
: 2 mar
Qioi Qio2 Carl) Cs cg = IClO4
isuHy 2N5I30 2N5130 ee aS eae a t = TBABIOS
osc BUFFER AMP TRIDLER ean ae ; 4 Be AUDIO POWER
01 .0l 1Cl03_ ~ AMP
i a ie 5.
= r 75
—__— DISCRIMINATOR | 047. ae
R28 RI29 eu = INs7aBAT cies | clés cie7=* ge
i” ae 2K ly ey, al
‘Te105 cy =
boa) Qu3
; oom] SPS952
| [Row ces "lace S.3KQ SQUELCHED
oe i eae TRIO4 oO [6] AMP-AUDIO cie2
| cise | RIG6 ciél a €) (P] (O/-4e :
CRIOL — "OF ms 113 . : . o 6 cI74
uv2209 002 | eet cise RISO fb 250 uw
i | .047 5.6K RI52
RI LL aes = on
4.7K: =
AUTOMATIC FREQUENCY CONTROL cis al es0 i) a | iL
| 00! Ban eae RI47 em aie c
1 | Ae ou 10K Se OsP5982)
2 =e == 47 | RI45 |
———— C157 3.3K he —
[RECEIVE CRYSTAL WARMER CIRCUIT _—‘| sIME 8 |
a. | at ju |
| GROS“A RIBS 2 = ; te ENOISEMSQUELCH te a
IN5849 470 ¢ 2w | __ IMT Te ee a ee 2.
|
|
:
ee. eee
NOTES
, | ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE ARE OHMS
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE 4 w
[J] DENOTES ADJUSTABLE COMPONENTS
(CI DENOTES CIRCUIT JUNCTION POINTS
HEAVY LINE DENOTES APPARENT SIGNAL FLOW
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH A
VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT
LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING
CONDITIONS
u = UNSQUELCHED
s = SQUELCHED - THRESHOLD
t = SQUELCHED- TIGHT
aroun
3-6 RECEIVER SCHEMATIC
mcu r i SECTION 3
;
* = ~~ —- - wipe: Simmer ene —
'
~9 ‘
, ‘
- tty
oo S
+" <*
“{ i
id!
‘ Gs
o
2am n
} ee
sh OES
r+ ¢
, }
.
Big ie
ee
: 5
4
an oe FE
-_ - Can at
Sti, dietelie ahh ilel spamaaina a
as 2 see F
i
4 > ha =
.
}
Be a wh neo
es
>
wy
©
a
a
oe
3)
Y
=|
v
le}
Zz
alignment.
Preliminary I.F.
Final discrim-
if radio has not been badly misaligned.
Final touch up for
vo
G,
«
2
uM
°
2
©
c
cal
optimum sensitivity
REC;
During the receiver alignment procedure, set
(i.e., umsquelched). Set volume control to c
cycle tone during the alignment procedure hel
Signal Source Observe
10.7 MHz Signal Generator, TP103, using DC V
unmodulated. Connect Signal
Generator to Drain of 9106,
using a series 10,000 ohm
resistor.
Measure DC voltag
of R154, using DC C)
(R154 is a 39 ohm
resistor mounted CD
close to the rear
haan reve.
TP104, using DC
pz)
TP105, using DC .
e)
None Required TP101, using DC V b9 Ge
TP102, using DC 2 Op]
b L123 ©
odes
Signal generator source cap- TP105, using DC S @: () ED
able of being set to within
+.00025% of channel frequen-
cy. Set signal generator out-
put channel frequency. Modu- }
late generator with a 1000 Hz
tone, with +3 KHz peak modu- TP103, using DC
lation deviation. On multiple
channel radio, do alignment
on channel #1.
oot fof
S
Reduce signal generator out- TP104, using DC v¥ C) D
put to zero signal. If gen-
erator attenuator does not |
permit signal to be reduced d q b
below receiver noise level,
S
|
disconnect signal generator TP105, using DC vy
from antenna jack. ) OOD
|
Bring signal generator atten- TP105, using DC v4
uator up to a level that gives
a good, quieting, signal. Be S)
sure signal generator is ac- ae)
curately set to channel fre- RIS2 WD)
quency. 4
. Jong
Signal generator, as above, Distortion meter, () —se—
tuned to exact channel fre- to loudspeaker te QQ
quency, and modulated by a Follow usual distq S)
1000 Hz tone, with peak mod- meter procedures ok ae)
ulation deviation of 3 KHz. ting null and lev @)
trols. If a disto
ter is not availa
step may be accom
observing the 1,0
signal on the lou¢ LlO¥®)
e
terminals with an
loscope, and tuni
least noise on th
trace. Do NOT att
touch up the tuni
an unmodulated si
tuning for silenc
will result ina
sponse from the c
ter and poor weak
performance.
Signal generator, as above,
be sure it has not drifted
off channel.
LIGNMENT CHART
oe SECTION 3
= ee
.
~ antune amg
i t
d Lan:
Ww e
?
ive aed poe bie,
rs ‘o- *
7 Pe,
ml
3 - ©
Li
ote a
Be ae
ie
alignment. Not necessary
if radio has not been badly misaligned.
Preliminary I.F.
Final discrim-
inator & AFC
Final touch up for
optimum sensitivity
RECEIVER ALIGNMENT PROCEDURE
During the receiver alignment procedure, set the squelch control to maximum counter clockwise position,
(i.e., umsquelched). Set volume control to comfortable listening level.
cycle tone during the alignment procedure helps to avoid alignment errors.
Signal Source
10.7 MHz Signal Generator,
unmodulated. Connect Signal
Generator to Drain of Q106,
using a series 10,000 ohm
resistor.
None Required
Signal generator source cap-
able of being set to within
+.00025% of channel frequen-
cy. Set signal generator out-
put channel frequency. Modu-
late generator with a 1000 Hz
tone, with +3 KHz peak modu-
lation deviation. On multiple
channel radio, do alignment
on channel #1.
Reduce signal qenerator out-
put to zero signal. If gen-
erator attenuator does not
permit signal to be reduced
below receiver noise level,
disconnect signal generator
from antenna jack.
Bring signal generator atten-
uator up to a level that gives
a good, quieting, signal. Be
sure signal generator is ac-
curately set to channel fre-
quency.
Signal generator, as above,
tuned to exact channel fre-
quency, and modulated by a
1000 Hz tone, with peak mod-
ulation deviation of 3 KHz.
Signal generator, as above,
be sure it has not drifted
off channel.
TP103, using DC VTVM
Listening to received 1,000
Expected Reading, Notes
Adjust L119,L120,T101 (top
and bottom slugs) for maximum
TP103 voltage.
Adjust signal generator output
level to obtain a .3 volts pos-
itive” reading at TP103. As
alignment progresses, reduce
signal level to maintain the
-3 volts reading.
Measure DC voltage at top
of R154, using DC VTVM.
(R154 is a 39 ohm, 2 watt
resistor mounted on end,
close to the rear of the
chassis)
No adjustments in this step.
Measured voltage should be close
to 8.2 volts. From this measure-
ment, determine proper discrim-
inator set voltage. Discrimina-
tor set voltage will be )/2 of
voltage at top of R154.
using
Adjust L123 to obtain the
proper discriminator set
voltage as determined by
Step 2.
This is a discriminator adjust-
ment. TP104 voltage should swing
through the discriminator set
voltage determined in Step 2.
using
Adjust R132 to obtain +4,0
volts reading at TP105.
Tune L104 for minimum positive
or maximum negative reading
on TP1O1.
This adjusts output of AFC amp-
lifier to be at +4.0 volts when
receiving an on-channel signal.
0 to +.2 volts. +.3 volts in-
dicates oscillator is not
oscillating.
using DC VTVM
Tune 1107 for maximum negative
reading on TP102.
to -.4 volts.
TP105, using DC VTVM
If the channel frequency is
below 467 MHz, set the alum-
inum core on L1ll even with
the top of the coil form. If
the channel frequency is above
467 MHz, set the aluminum core
on Llll all the way to the
bottom of the coil form. Once
set, it is not necessary to
adjust L111 during the tuning
procedure.
Adjust L101A to obtain +4.0
volts reading on TP105.
This is the receiver frequency
adjustment. TP105 reading should
swing through the 4.0 volts set-
ting as L101 is adjusted.
TP103, using DC VTVM
TP104, using DC VTVM
Adjust L109,L110,L112,L113,
L114,1L115,L119,L120, and T101
top and bottom slugs for max-
imum reading at TP103.
Adjust L123 to obtain proper
discriminator set voltage as
determined in Step 2.
As alignment progresses, reduce
signal generator output level
to maintain about .3 volts out-
put at TP103. Caution: It is
possible to tune the slugs on
T101 to a false peak. Correct
peak is the one with both top
and bottom slugs furthest out
from the center of the trans-
former.
This adjusts discriminator to
center of receiver bandpass.
TP105, using DC VTVM
TP105, using DC
Distortion meter, connected
to loudspeaker terminals.
Follow usual distortion
meter procedures for set-
ting null and level con-
trols. If a distortion me-
ter is not available, this
step may be accomplished by
observing the 1,000 cycle
signal on the loudspeaker
terminals with an oscil-
loscope, and tuning for
least noise on the sine wave|
trace. Do NOT attempt to
touch up the tuning by using}
an unmodulated signal and
tuning for silencing; this
will result in a peaked re-
sponse from the crystal fil-
ter and poor weak signal
performance.
Adjust R132 to obtain +4.0
volts reading at TP105.
Adjust L101A to obtain +4.0
volts reading on TP105. On
multiple channel receivers
repeat this in channels 2,3,
and 4, adjusting L101B,C, and
D respectively.
Adjust L109,L110,L112,L113,
L114,L115,L119,L120,T101,
(top and bottom).
Repeat steps x | and
with zero signal input.
Repeat step 12 on each
channel with a strong signal.
This adjusts AFC voltage to
center value when no signal
received.
This adjusts receiver local
oscillator chain to proper
center frequency.
During this procedure keep
signal level from the signal
generator at a value sufficient
to obtain a -12 db(25%) read-
ing on the distortion meter.
Remember that this is a "touch
up" type of adjustment. None of
the adjustments should be moved
more than a small amount from
the setting previously obtained
mcu Fr
3-7 RECEIVER
ALIGNMENT CHART
-8-
rise ©
[4]u]
SECTION 3
a
rome Peseta
Cl stem ROD Ry welnse eeebhee © ieotee Ooibee see
C,¢ bwtemre of GHAPME! terel qoiteted! «Mameehelp et
wowure See gute Seiva &
Se OM pee Reet feet pep “ents ) <7 ee : mY y
— - - —. ———— en cr ne el ant tg a — nama se RAS om pe ertonaniine hae eet _~
ier “btivetey lenge reghe 7 os) 209T WALA seule st vote et verge ee » »in Wyenar’, ieee ae A Aan
© - Sigtde ee leat amtnae wet icgely amare fers : \ = Sypehiedt -2 a
: COP? mii dime (Hove = D oe he Sibir? re oh ep Aap
‘ mobes .nehekviorrd Formxinps by _«f # baat nieRe @ Mies ,
dae ave dé » AA cd ti ee | ee
ye » ~
7 ov veh J
-
:
‘
|
$
=
:
;
a
ww
7
.
BF
~
.f
y
i;
hi
~ ¥)
is a i ae
= 5
y
;
Sen Danae
é
-
>
4
ba .
i 7
- <
a : 4 oo
‘ ‘
; - t's
A ee
:
4
+ ‘ _
;
“4
<
ag APE we Bo na | ‘ h Sa
+’ §
> «
>
at
A
+
a: ee
a ,
PP). '
: ' a =i
. » wot « 1 uriv ran, wins: pet ¥ =
} | =
= > ove 2 ; ¢
| A ene ;
ad rm 4 ~ ’ =
De ae serene tanner aee vote c
q Ce
boy ow ras < Vise oH
AR) SOP gt is Gee eae 2s
ae
5
>
<4
*
5
4
>
rowae
= 9r;-
=e.
DIR “tos
Ae
-
a
4
Sj te VAT ee '«
j ranth teal taal yep dbho:
os Tinga a eRe rue
ate 4 the. i@y arse whe
“9” se “yew
rere
cs meee et.
ed a i a iets
YF deport pomred
Cprveph deed y
SECTION 4
TRANSMITTER
mcu r SECTION 4
& WOlT Use
bh 0 1G MAA eA
<!
sey ye: Yi 2oMei a £ ay oes
ASTTIMeCKANT
ie
SECTION 4 TRANSMITTER
4-1 TRANSMITTER CIRCUIT DESCRIPTION
AUDIO SECTION
Integrated Circuit IC201 (sections A and B), constitutes the
audio circuitry of the transmitter. IC201A provides a high im-
pedance input for the ceramicmicrophone, and supplies pre-empha-
Sis and amplification prior to the modulation limiting circuit
which consists of CR210 and CR211. 1C201B provides additional
amplification, and acts as an active filter to provide the post-
limiter filter action. The output of IC201B is fed to a control
potentiometer which controls the audio voltage sent to the mod-
ulator section and, therefore, is used to set the peak modulation
deviation of the transmitter.
IC201B also provides an amplified input to feed tones for
continuous tone squelch systems, or other tone systems, into the
transmitter modulation circuits.
CRYSTAL OSCILLATOR
Y201 serves as the crystal oscillator, using a crystal at
1/36 of the channel frequency. The crystal is a fundamental cut,
in the frequency range 12.5 to 14.3 MHz.
Direct frequency modulation of the crystal is obtained by
applying the modulation signals from the audio section to varactor
modulator diode, CR201A.
FREQUENCY MULTIPLIER SYSTEM
The output of the crystal oscillator, Q201, is tuned to three
times the crystal frequency, and this signalis amplified by buf-
fer-amplifier Q202, then delivered to the tripler circuit, 9203,
then delivered to the doubler circuit Q204. Q204 drives another
doubler, Q205, to obtain a combined frequency multiplication of
36 to reach the channel frequencies from 450-470 MHz. The doubler
Q205 developes about 150 milliwatts of power to drive the power
output module IC50l.
POWER OUTPUT SECTION
The packaged power output module, IC501, contains three cas-
caded stages of power amplification. Its gain, and therefore its
power output, can be controlled over certain limits by the power
mcu r Lan SECTION 4
control circuit consisting of R227 and Q206, which varies the DC
voltage input to one of the early amplifier stages. In normal
operation, R227 is adjusted to provide the rated output from the
transmitter, but it can be set for reduced power operation for
special applications. In order to protect the power module from
possib’e damage through overheating, a thermal protection circuit
is included. RT20l1 is a thermistor that rapidly increases in re-
sistance as its temperature reaches certain levels. RT201 is ‘at-
tached to one of the mounting bolts on IC501. When the tempera-
ture approaches excessive levels, RT201 increases in resistance,
thereby reducing the voltage supplied to IC501 by the power con-
ror veircuit.
4-2 TRANSMITTER VOLTAGES
Transmitter Transistors:
Emitter Base Collector
Q201 S0 2.0 Se
Q202 0 0.55. 6.0
W203 0 0.34 TO a0)
Q204 0 0.05 12.0
Q205 @) -0.62 13.8
Q206 (PNP) P20 7.4 Os sing
Q207 0.4 0.8 13.0 -@. 25°C
Q208 @) 0.4 13..0.@. 25°C
Transmitter Integrated Circuits:
TC2Z01 4.0 4.0 4.0 0 4.0
Icsol 0 Opes 0 6.6 0 -0.
meu r -2- SECTION 4
SNOHdOYDIN
MYOMLIN
OSNIDVHS
oiany ONY
NOILVANISLLV
TOULNOD ‘L'L'd
JIYNOS
Y3M0d
AS'¢i OL
4311s
Da|SSvd MO1Sa
| e
VNNILNY
OL
Nz ‘olzyo
YaLIWIt
NOLLYINGOW AYOMLIN >
Ovey i1snrav
NOILVIA3G
NOILVINGOW
3ao1a y311S
YSLM4 JAILOV
GNV Y3IJIIdAV
8024)
yOLlv1N93y
JOVINOA
SLIOA 2°68 +
9020 ‘102 14
ONLNOD
NOIL931L04d
TWAYSHL
S020 ¥020
10S9! J INGON
YSIS NV 4¥3718n0d af ¥318Nn0d
Y3MOd x |
£020
Yad L
@
1024¥9 YOLVINGOW ADNINDSY4
WJ 1OSYIG JGOIG YOLOVYWA
oO 94 9) WALSAYD
TOULNOD ADNINOIYS
2020 1020
431d AV YOLY11IDSO
u34ssne pse TWLSAYD
4-3 TRANSMITTER BLOCK DIAGRAM
SECTION 4
mcu r
5 Mya ie
sod G30, seal
MLS pan: heute ah
Bo
oad & tS a at
? “uw i ,
* wate +
— \
4 i= (ar re we Mea nal
g 4 SF ie Ts at sty] . oe —
c ‘ Tab hy tt e ‘ee apes hs Fa Get, a : 2 ge wy oe ja. ey
Savites biibahs E cee Sra en Ee ee ips ee | Lee hate a has. tee) 2
-. ne ae | mS Peas a hae sh.
i pe € 5 a -< R. My be eh pee te a % 25 ~- he © ae wees ve he abe
te al ; sect att "4 ie" S : , ] de . e gl eee f bi A ES - lf, ipa ¥ Te ease
aT r a% 24) eo - j
ra — aS i d.% Ps rok hd were
ay worl ’ fr ee Beaks! Gok ey
SS Pie mates “f ‘ he fas 4 oe ie , a jy ‘ et esr y ——
a) - phe 4 .
é Sj ee | i
. y = = i A ee Teo.
| alee :
<r fay : g ae e r *
FS ee sppiclctailbeweniieee Sm Sait va
be ) Be we te F ! ;
aes = we ae lee A ‘ :
=. > 2 I , ~ 4. ;
Cre ie + 2 : a By. he ip ~ q
\ nal a : +s > com pe ott iB ¥
a igs ee Bees ed nee
J Be res MS les ed Sh) ;
' t " i Das Bie at ni we = f ‘ ‘
4 } See { a We 4 zi f ‘
alte PS Wace ee. 7 iD a -
.| pa sh oe Se ae sak
ma eh ee i ee) :
aad 7
> ee » 1
a: ;
4 i
j { : me i
7) 2
pe bonip 4
>
“*? i - i 77
fa pepe meee nntnerrinmt oui fips weiner :
*
= A
aA =
}
t
z
a a
a
| [
i
:
:
AONE CHL
MYC TOM MSE &
LE CHE EL
‘ae
ia my,
501-235
TRANSMITTER BOARD
4-4 TRANSMITTER BOARD TOP VIEW
)
SECTION 4
mcu fr
4-5 TRANSMITTER BOARD BOTTOM VIEW
mcu rr -5- SECTION 4
ET AA) WD) ke bee
y és aie Y Ts
i <3 m]
at
Sp ep eh ee
t
en ord
f :
WEA aia
bah
ar
ea. |
; TT F
uoTTod
mae ith
' 0
‘
ne
7
REF
Tx ANTENNA
POWER AMP MODULE
1C50I 5
|
CRYSTAL WARMER CIRCUIT T1227
R244 = [M]
c25el c2s3
R
ane Seen
NOTES
FALL RESISTOR VALUES ta)T SPECIFIED OTHERWISE ARE OHMS,
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE '¥4 W.
DENOTES ADJUSTABLE COMPONENTS.
([) DENOTES CIRCUIT JUNCTION POINTS.
HEAVY LINES DENOTES APPARENT SIGNAL FLOW.
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH A
VTVM, SUPPLY VOLTAGE = 13.8 VDC. AT INPUT TO
VOLTAGES INDICATED ARE MEASURED WITH TRANSMITTER IN
OPERATION AND CONNECTED TO A PROPER LOAD.
Opun
4-6 TRANSMITTER SCHEMATIC
= 6 SECTION 4
Pape -
-
aie Agee
iy
—<—
7
Lang:
a i8)
waiv M
iba (7
C2s8 R234 Drea
w aa ki R229 Ci
sakes a | 10K ol
a! R23!
8 oa 100K
Ic201B
V2 LM358N
re [Reag)
OIME
C266
«IMF
DEVIATION
c2i8
01
L209 ~ 203
.68UHY 696-5
TRIPLER _ C22i C223 a
C4 8 V
c2is_ 10K = rag | > VE Fl Real polar Pooaz
- 3 001 : j
aa) Ezek ea 2 cap °778 pousLer| '**
0 a.2PF a2p Pp
of
L220
TP205
R226
10K
C238.
c239 SPF
2PF
mcu r
\ L222
REF
Tx ANTENNA
5 4 3
POWER AMP MODULE
IC50!
ivy
: + rt, yf 1M}
241
cRr2i2 a ae
INs8498 ae wooo oT
~RT202/
\ {C]
NOTES
FALL RESISTOR VALUES ta0T SPECIFIED OTHERWISE ARE OHMS,
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE 14 w.
("——] DENOTES ADJUSTABLE COMPONENTS.
(«DENOTES CIRCUIT JUNCTION POINTS.
HEAVY LINES DENOTES APPARENT SIGNAL FLOW.
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH*A
VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO
VOLTAGES INDICATED ARE MEASURED WITH TRANSMITTER IN
OPERATION AND CONNECTED TO A PROPER LOAD.
pun
4-6 TRANSMITTER SCHEMATIC
“Or SECTION 4
> i very one co —— NRG eet NE AM ie I «
yee”
\ “Si. > a ow ects me
i cen yt SO howe "
: pe ay yg a A » 12 | y
Pe 1 oo eo Come a ae aah P
y~- * ” aes Sas te AA yea
5
A 3 i
{ i ; %,
yi
ba ew awe a ‘
eT,
“ae
i
,
if
x
;
i
}
=
ay ,
! na i
, Nal ij ae
el f
iy p a se y
: Ear e
; a egy | By]
ee
Ba
if we it
ip
% aT me
ss TUNING CHART
SECTION 4
;
‘ ‘ @ :
let een ee ode mn re ec ARES 9 Re Ee I PAI srg ny even a eee Oe OR Ree per | RGR hr eREMRA +
> ‘
‘~
—*
bs i —fageallifinand
’ , ~t ti
pe at at
< : oh
ot ’ bai 7
;
:
4
TRANSMITTER TUNING
During Tune-Up Procedure, press the microphone button only when actually taking readings or making
tuning adjustments. Until tune-up is completed, keep transmitter on time to a minimum.
Connect a 50 ohm load and R.F. wattmeter to the antenna terminal.
On multiple channel transmitters, conduct first tuning on highest frequency channel.
VTVM TP201 L201,and L205. L204 for +.55 volts,no drive
Ground lead on chassis minimum positive voltage +.4 to -.3 volts nor-
reading (or maximum nega- mal. A false peak on
Note: a 20,000 ohm per tive if TP2 goes negative). L205 is possible, look
volt multimeter,on the for biggest one.
2.5 or 5 volts scale
may be used for these TP202 | #2] L207 and L208 for minimum +.5 volt, no drive
Proceedings. Readings Positive (or maximum neg- +.25 to -.3 volts nor-
will be 20% lower than ative) voltage reading. mal.
those given here on 2.5 Then touch up L205 for
volt scale,and 10% lowe maximum negative voltage
on 5 volt scale. reading.
TP203 L210,L211,L212 for nega- no drive
tive voltage reading.Then -4 volts nor-
touch up L208 for maximum
negative reading.
TP204 #4] L214,L215 and C231 for no drive
maximum negative reading. -9 volts nor-
Then touch up L212 for A
maximum negative reading.
TP205 #5 | €233,C235,C237 for max- no drive
imum negative reading. volts normal.
Then touch up L214,L215,
C235 for maximum negative
reading.
RF power meter, con- RF power output #6 R227 to 10 watts output 10 watts normal.
nected to antenna jack.
In multiple channel transmitters, if spacing between highest and lowest channel
exceeds 3 MHz go back through all but the first step and tune for a compromise
adjustment between the highest and lowest channel.
Frequency meter, FM mon- Switch to channel #1 and adjust L201A to exact channel frequency. Then switch to
itor or counter, with channels 2,3, and 4, and adjust L201B, L201c, and L201D respectively to exact channel
+ .00025% accuracy. frequency. If either L201A,B,C,D have been changed appreciably during this step, go
back and repeat the frequency setting on all channels.
FM Modulation Monitor 48 Inject a 100 millivolt (.1 volt) tone at 1,000 Hz into the microphone jack (pin #4
high, pin #1 ground), and adjust R240 so modulation deviation just reaches + 5 KHz
peak. Then, in CTCSS units, remove the 1,000 Hz tone and adjust R605 on the cTCSS
board to obtain +.75 KHz peak modulation deviation on the CTCSS tone. Reinsert the
1,000 Hz tone and adjust R240, so combined modulation peak deviation of the 1,000 Hz
tone and the CTCSS tone is + 5 KHz peak. If R240 was changed much, recheck the devi-
ation due to the CTCSS tone alone, to be sure you still have .75 KHz peak deviation
on CTCSS tone.
mcu
4-7 TRANSMITTER TUNING CHART
a7a
SECTION 4
mn ‘haan Cenk Aart | RIL Meigs cdr ya PaaS acm ld MS: henry =p : : \
‘ 4 » ‘ a6 al "
a . it >
a rb ee aes @ “ be) or -ommep Qazi t , | = ht
d . 1 aoe ~ oF exivetees Ltoa AN? Tw (igesa La if, 3 es det
‘, - i
Ss ?
‘ ‘ ’ — ° o a oe ™~ ~ » remot: oh i at eee
' 1 vise ALM hoe fe eitin, “T, eyrds eteoeg ; eo
y , - ~ => ‘ ad
o F : , © + wh re tam, S B.g7 16 e .
.
anette Vie Cine Penns ne o 7 eT ne Clee eR tne MAE es sone ere ante Rg lryee 5 , are ‘ ee
“Y Tink Sa - : ~- -
, a rs ; “ew iit Pa ay ae ey
—_, ‘ Se eee ~—4 <hbe Pe ee ~foy = dere natn sneha ae - : mat os vl , P
i ' ; 2 .
tote % we he S , - , Pe’ a be
; ; peater otek ee a. 3 a i Te , $5 ‘
tam , { ee Lae !
. » tdeipd fo ah Wy Lia. ae LS Jet ie :
’ ‘ : Lr ; ;
‘ x ” a fe - ‘ +>. Boda - £ ~ = ey" a F re ¢ '
t aot. a Gest ot) ee ‘ 2
' ad . ns S *
: ey af eek = 5ee>ti4 1 4 Uitig = \
: i :
¥ ‘ tl ¥ ‘i
‘ - i ‘vat 4 7 , er + }
4 f %
e sf i 4 } c P
‘ a
’ ‘ . ren ee 4 nagall } " ; 5
* ~ 7 x ~
‘ ’ ‘ 7.
’ “
2 F
¥ 4 t
j "4 y: :
f be
ne - dite’, me ot i te ane od or thy a Fh en te
+ ‘ : “ 4 eee . rs F- e S
ow 7 oo ~~ - —¥
: ‘ ’ eh arty “Ww ; :
+ ee yy 2 ¢ 4 4 5
x
ate ae PO te ee ee) phd LN Rae 1 ereeaitht ee een tT Cyrene Ce oe? ee oe
ar is eh % - Cu Pamay y 29 fs é ri ; pa Peak Rn eg 4 i
« by j che tee Rite t. i tanan : w bee’ Sure +). ) RaeD
" 2 F ‘ a/8428% 9 “ jee? ' ; rer Sth Cree ¥ Pa
: : 4 eS sug Ar y
DA = me ‘oe heed ? aap oe Repke 6 ERED Ae er mt ene an) ape eating apsinetet sept] 4 ie i i
. a Oats «Nan vat eet Hal PO oa :
, - ”
- pe ? “ “
av “| of r me y é F
i ‘ Wa wi 1 i . , Ae
‘ . tax use a 4 5 ie
so és “i ¢ ‘ aa aca tee var 9 : 7] 10 >.
' a hee | ”% ‘ dé #5 mei aryr> 4 i me ml >) _ i P ’ : Mi
wom? - r : ay me
t ; r , ‘
rae BO. 50 A o 5 a. ey Vos Alt soniapenpeieamamadias ov
SECTION 5
POWER SUPPLY
mci. 6 SECTION 5
ey a ;
8 Hor
ap
OP
©
ri '
193
geen sen
Le
Su
a).
a
i)
¢
a
an
= iT
ST el em, 4 Gh Atay)
i Lhe ni :
ue
ih
are
, ‘ tf hi
@ Morraaa! ©.
: a ’ ’ p 5 - = te)
Ce ee 9 =f
YII9U2 AIWOF
i
)
SECTION 5 POWER SUPPLY
5-1 REGULATED POWER SUPPLY CIRCUIT DESCRIPTION
The circuit diagram of the power supply is shown as a part
of the overall repeater schematic, in Section 7.
The power supply transformer T501 transforms the LIE VAC wine
voltage to 38 VAC, center tapped, at the secondary. Rectifiers
CR501, CR502, CR503, CR504 and filter capacitor c503, rectify and
filter this secondary voltage to produce approximately 23 VDC
which is reduced to 13.0 VDC by the series-pass regulator tran-
sistor Q501. CR501, CR502, and C502 provide a separate 23 VDC
supply for the Regulator Board Circuitry.
The regulator circuitry operates as follows:
R404, R405, and R406 divide Q501's output (emitter) voltage
down to a sample voltage slightly higher than that of CR401. Q402
continuously compares this sample voltage with the reference volt-
age of CR401 and adjusts the drive through amplifier Q401 to the
regulator transistor Q501 accordingly.
As an example, assume that the radio set (load) increases
the current drain on Q501, causing the output voltage, and conse-
quently the sample voltage, to drop slightly. The reduction of
base-emitter voltage of Q402 would cause a slight decrease in col-
lector current which in turn would increase drive to Q401 (through
R402). Q401 would then increase the kase current to Q501 causing
it to supply more current to the loac and raise the output volt-
age slightly. In this manner an equilibrium is reached. Poten-
tiometer R405 allows adjustment of the output voltage which is
normally set for 13.0 VDC under Receive (standby) conditions.
mcu r ost SECTION 5
5-2 POWER SUPPLY VOLTAGES
Emitter Base Collector
Q401 13.8 15.6 23
Q402 6 6.5 16.6
Q501 3 13.8 26
mcu r i Ar: SECTION 5
mcur
REGULATOR BD
REGULATOR BD
ee.
302-032
302-032
BOTTOM VIEW
FIG. 5-3
SECTION 5
>i
J
y
y = an rt e
“ 38, b 8 |
Fe we) ok
ula 4 : is a et i poet eh Fs i
tere wwe ; — : . . a’ —
a ; :
hata 3 \
ov. ba a4” Oe
, ” naar
: je \ } Fs } ‘ :
3 rae
ae \
eit :
phen teraemanmnage st 3
tae
4 ra Ae?
ON hy pl de, Tacs ty
fe ” : . ho
. ' ect Wet, 1S eee S
‘| ve u 1et ye ' J Fi rd “> . =e! Fe ¥
hes et Eh = ss ill ip oeabene ins spp abled inh pe AcuaG eadlaegaeld
be .
ee | wiv 90T - Pee oy
n Pat
r; = 2
4
? x
i be as
3 J ; ok
¢
i 7 ,
1 ; 1, Pet ,
CE Cpu QS Th. Sat
ot UW so oe : #O : j :
She oot ee — ersen anes et coqurs a en PS AOR CRANE AL II AEE AA - : J - > ae
; , ee - : F 4 r
| " . hid > i a. = : r
i j
ary eh cit PUM
j fi & iPehiy
‘ hin)
“i
Et F
SECTION 6
MA-90 TONE ENCODER- DECODER,
&
MA-95 ENCODER
mcu rf SECTION 6
oc hd
‘ ie ,
|
beter
a MOITIae 3
eka i. ONIN oy tocapre ph
9300930 -A3I009ua anor ¢ 0e-AM
dO fy “y pa ae- yay Me ? Ae a ;
+ Ew hal Yad | -| wie i ‘ a ae ee j
SECTION 6 MA-90 TONE ENCODER-DECODER, AND MA-95 TONE ENCODER
6-1 GENERAL INFORMATION
The model MA-90 Tone Squelch Encoder-Decoder is used as a
tone decoder for CTCSS (tone squelch) operation of the Regency
MICRO-COM U1OR repeater. Since the MA-90 can serve as either an
encoder or a decoder, it can be used in either the encoder or de-
coder sockets of the U1LOR repeater.
The model MA-95 Tone Squelch Encoder is a simplified version
of the MA-90 encoder-decoder, in which only those components need-
ed for the encoding function are installed.
Normally, for. each tone frequency accommodated by the MICRO-
COM U1OR repeater, one MA-90 is installed in a decoder position
and one MA-95 is installed in an encode position.
6-2 MA-90 CIRCUIT DESCRIPTION (TONE DECODING CONDITION)
Refer to the Circuit Diagram, Figure 6-4. When point "D" is
grounded, the module is in the decoding mode.
Audio from the receiver discriminator is fed into the tone
squelch board at terminal L, and passes through the High Pass Fil-
ter IC601, and back to the receiver's audio amplifier circuits at
terminal J. The high pass filter removes the CTCSS tones, which
are below the normally utilized speech frequencies, so they will
not be heard on the receiver loudspeaker.
Audio from the receiver discriminator (at L) is also fed in-
to IC602, which contains a low pass filter, and a limiter ampli-
fier. The low pass filter removes most of the speech and higher
frequency noise components from the signal, leaving essentially
only the CTCSS tone frequencies and low frequency noise components.
This filtered signal is then passed to the combination of IC603
and Ic604, which acts as a high Q band pass filter, tuned sharply
to the wanted cCTCSS tone. IC603 contains the tone determining
portions of the combination, and IC604 contains the necessary amp-
lifiers for the filter arrangement. If the received tone is the
proper one, as determined by IC603, it will be present in the out-
put of the IC603--IC604 combination. This tone then passes to
IC605, which is a detector circuit that detects the presence (or
absence) of a tone signal.
The IC605 output, is normally high, and goes to a low voltage
upon receipt of tone. This output appears at terminal K to signify
mcu r sol SECTION 6
the receipt of a signal having the designated tone squelch fre-
quency.
6-3 CIRCUIT DESCRIPTION, MA-95 ENCODER
The MA-95 is an encode only version of the MA-90. Refer to
the circuit diagram, Figure 6-5. The combination of IC603 and
Ic604 is an oscillator, with the frequency of oscillation being
determined by the components in IC603.
The oscillation output of IC603, IC604 is fed to F, and thus
to the modulation section of the transmitter.
The amplitude of the tone voltage sent to the transmitter is
controlled by R605, which is the control for adjusting the amount
of modulation deviation caused by the tone.
mcur me SECTION 6
J eans Sonne
RECEIVER TONE
Mai > xO ba nO Ou oD
Z Fh PL PSIN, PL
nU) VUNIN
} iva)
AND SPEECH IN —
BOTTOM VIEW OF ASS‘Y
SPEECH OUT
TONE OUT
TO TRANS
TONE BOARD 302-508 |
NOT SPECIFIED OTHERWISE ARE
NOT SPECIFIED OTHERWISE ARE
IS FOR BASIC RADIO SCHEMATIC.
NNECTION POINTS TO
ENCODER -DECODER BOARD
-3- SECTION 6
the receipt of a signal having the designated tone squelch fre-
quency.
6-3 CIRCUIT DESCRIPTION, MA-95 ENCODER
The MA-95 is an encode only version of the MA-90. Refer to
the circuit diagram, Figure 6-5. The combination of IC603 and
Ic604 is an oscillator, with the frequency of oscillation being
determined by the components in IC603.
The oscillation output of IC603, IC604 is fed to F, and thus
to the modulation section of the transmitter.
The amplitude of the tone voltage sent to the transmitter is
controlled by R605, which is the control for adjusting the amount
of modulation deviation caused by the tone.
mcur ae SECTION 6
TONE BOARD
RECEIVER TONE
AND SPEECH IN —
C60! .
.OIMF
—
602
OIMF 7
SPEECH OUT
MIC
HANG UP
BUTTON
+ VOLTS
mcu fr
st ee EERE
Hoes Ou S42
Zz Ze
T) gj VU
IC605
a BOTTOM VIEW OF ASS*Y
R6EO4
ra | ISK RECEIVER
C608 CONTROL
eels
;
TONE C609
R6OS} DEVIATION O.1 MF
R6O7
100K TONE OUT
TO TRANS
C6IO
on OImr T
NOES
ALL CAPACITOR VALUES NOT SPECIFIED OTHERWISE ARE
PICO FARADS.
ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE ARE
OHMS.
2. REFER TO DRAWING 700-215 FOR BASIC RADIO SCHEMATIC.
3. LETTERED BOXES ARE CONNECTION POINTS TO
DRAWING 700-2i5
6-4 MA-90 TONE ENCODER -DECODER BOARD
rs- SECTION 6
i oe
—
*
-
<= em eee Rone fs
A me I 6
.
‘
a
ars re
Ate) Sort
ae Cees
13) em etalk
i
‘i Aig’ Le
mi C609
EVIATION Oe! MF
RGO7
| mney TONE OUT
| U
| ap
J oe O TRANS
| aN
ECEIVER TONE
TONE ENCODE BOARD IND SPEECH IN
__NOT SPECIFIED OTHERWISE
NOT SPECIFIED OTHERWISE
' ENCODER BOARD
h- SECTION 6
q a al . an tan . a 7 le hia Mimsy
: ‘ bay ra aes Raat ’ ae ji 2 wage CAREER trae 8
>
Ax -
J fi
& = =
1 ~~
a Fe
% 7 = “
»
~ i“ a; & -
i
7 J Py :
N ;
Dn ere meer oF
~
OF
tinge epee are
omer w “283k
”
BOTTOM VIEW OF ASSEMBLY
+ VOLTS
TONE C609
R6OS} DEVIATION O.1 MF
REO?
ee TONE OUT
TO TRANS
C6IO
oaks
Alien, MF iL it
MIC
= SPEECH OUT RECEIVER TONE
HANG UP AND SPEECH IN
BUTTON
NOTES
1. ALL CAPACITOR VALUES NOT SPECIFIED OTHERWISE
ARE PICA FARADS.
ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE
ARE OHMS.
6-5 MA-95 TONE ENCODER BOARD
SECTION 6
Vie NTP) ate eS
a
4 ’
1 OE vas
cme eae ee =
4 “ 7
' oF
Te wets
"Bien!
a
i
ji
ae
ter ¥ rf
oan
Panes
h Boome f Me. ee '
TN ca? «ag A te
iit, er)
- 4 ot = B50 oaihied iy ed A ala od
ry
Pe ls Ae eo
b 2 ts
na) a 5) hy
k a3 IRENE. ENGR! aie
,
wer ae reed 4
« Fede re dele
fr ;
Ne Tu my - ; { :
. BFF « ies = : a.
{
.
&
=
*
*,
“ 4 ‘ x 7a
1G
oF Pet Z -
. ' y
ste
cal a cP Ey ;
Si ae
i? ‘
3
ian a ce
€
Ape
cA me ; mee
ay + ‘
- rs yaianeeaet! seas bulb
ic oat ate
Bi ee ai
SECTION 6A
MA-II6 TONE ENCODER-DECODER
&
MA-I2l ENCODER
a
a
“?
eB
UY tee
Ad WITH
i i
| =
rr
cal : 3
P : y
es ;
t f ; ‘, m
930093 1Si-AM
SECTION 6A MA-116 TONE ENCODER-DECODER, AND MA-121 TONE ENCODER
6A-1 GENERAL INFORMATION
The model MA-116 Tone Squelch Encoder-Decoder is used as a
tone decoder for CTCSS (tone squelch) operation of the Regency
MICRO-COM U10R repeater. Since the MA-116 can serve as either an
encoder or a decoder, it can be used in either the encoder or de-
coder sockets of the U10R repeater.
The model MA-121 Tone Squelch Encoder is a simplified version
of the MA-116 encoder-decoder, in which only those components need-
ed for the encoding function are installed.
Normally, for each tone frequency accommodated by the MICRO-
COM U1LOR repeater, one MA-116 is installed in a decoder position
and one MA-121 is installed in an encode position.
6A-2 MA-116 ENCODER-DECODER CIRCUIT DESCRIPTION (Tone Receiving
Condition)
Audio from the receiver discriminator is fed into the tone
squelch board at terminal L, and passes through the High Pass Filter
IC601A, and back to the receiver's audio amplifier circuits at
terminal J. The high pass filter removes the CTCSS tones, which are
below the normally utilized speech frequencies, so they will not
be heard on the receiver loudspeaker.
Audio from the receiver discriminator (At L) is also fed into
an active filter, consisting of IC601B, IC602A, and Ic602B. This
filter is a high Q, bandpass filter, that can be tuned for operation
on any of the CTCSS tone frequencies. The components of the filter
which determine the operating tone are precision resistors and
condensers; R601, R602, R603, R604, R605, R606, R607, Cé60l, and
C602.
If the received tone is the proper one, as determined by the
bandpass filter, it will be present in the output O67 1C602) and
will be amplified by IC603, and then rectified to a D.C.signal by
the tone rectifiers CR60l1 and CR602. This D.C. signal is then
amplified further by the D.C. amplifier, TC60SA)) Ine outpucior
Ic603 is normally high, and goes to a low voltage upon receipt of
proper tone. This output appears at terminal K, which connects to
the corresponding terminal K-on the receiver chassis, and is used
to disable the receiver audio section when no tone is being detected.
6A-3 MA-121 ENCODER CIRCUIT DESCRIPTION
A block diagram of the of the encode only circuit board is
shown on Figure 6A-7, and a circuit diagram is shown in Figure 6A-8.
The operating frequency of the tone system is controlled by
mcu xr -l- SECTION 6A
an Active filter, consisting of IC601B, IC602A, and Ic602B. This
filter is a high Q, bandpass filter, that can be tuned for operation
on any of the CTCSS tone frequencies. The components of the filter é
which determine the operating tone are precision resistors and A
condensers; R601, R602, R603, R604, R605, R606, R607, C601, and
C602.
IC603A is an integrated circuit operational amplifier, used as
a limiting amplifier. It is connected between one of the inputs and
one of the outputs of the active filter described above. This
limiting amplifier thus serves as a feedback path which causes the
total circuit to oscillate at a frequency determined by the active
filter. The limiting action of IC603 serves to keep the level of
oscillation from overloading the active filter, thus keeping the
output from the active filter sinusoidal.
6A-4 TONE SETTING INSTRUCTIONS (MA-116 and MA-121)
The tone frequency is determined by (a) the insertion of
jumpers to determine which of three bands of operation is desired,
and (b’ °°¢ ridjustment of a precision potentiometer to determine
the specific tone frequency.
For purposes of installing the jumpers, the total CTCSS frequency
is divided into three bands, the low band being 67.0 Hz to 110.9 Hz;
the middle band 114.8 Hz to 192.4 Hz, and the high band 203.5 Hz to
253 ..0°Hz:
INSTALL JUMPERS FOR THE PROPER BAND é
Figure 6A-9 shows the jumper locations. Determine which band
includes the desired frequency, and insert (or remove) jumpers
according to the following chart:
67K 02 H2? to2210n9. 82 Low Band JU601,JU602,JU603,JU604
are all removed.
114.8 Hz 4o6.192.4 Hz Middle Band JU601,JU603 in place.
JU602,JU604 removed.
2037.5? Az. fot 255 103. AzZ High Band JU602,JU604 in place.
JU603,JU605 removed.
After soldering or unsoldering jumpers, at least five minutes
should elapse before making any final frequency adjustment. This
is necessary to permit the precision resistors and capacitors in
the vicinity of the soldering points to stabilize in temperature.
TONE SETTING PRECAUTIONS
Accurate frequency setting is necessary on CTCSS (tone squelch)
systems. When making the above frequency adjustments, be sure that
you set the tone as precisely as possible. If the tone board is to €
mc + -2- SECTION 6A
operate in a system using reed type tone boards, be sure that
your frequency setting is within .1 or .2 Hz if possible. Especially
on reed tone systems, it is advisable to measure the tone frequency
of several of the existing units; it is not safe to assume that
the system is really operating on exactly the frequency stamped
on the nameplates.
6A-5 ADJUSTMENT PROCEDURE (Setting Tone Receivé Threshold on MA-116)
With the receiver in the receive condition, and the micro-
phone hang up button grounded to the transceiver chassis, inject
a signal of the appropriate channel frequency into the transceiver
antenna jack, and modulate this signal with the wanted CTCSS tone
frequency, with a deviation of plus and minus 200 Hz. Then, adjust
R612 (on the tone board) until the signal just opens the tone squelch
system, and allows the receiver audio to function, (See Fig. 6A-10).
After performing this adjustment of R612, check to be sure
that the tone squelch will actually open when the tone deviation
of the receive signal becomes as much as plus and minus 200 Hz.
Further, check to be sure that noise bursts do not come through
when the receiver is not receiving any incoming signal.
6A-6 ADJUSTMENT PROCEDURE (Setting Tone Modulation Deviation on
MA-121)
Adjust R618, on the tone squelch board to obtain a tone
modulation deviation of plus and minus 500 Hz. Then, insert a
100 millivolt, 1,000 Hz tone into pin four of the microphone
jack, and adjust R240, (the transmitter deviation control on the
transceiver) to obtain plus and minus 5 KHz peak modulation dev-
iation. If R240 was changed much, remove the 1,000 Hz tone, and
readjust R618 to obtain a tone squelch modulation deviation of plus
and minus 500 Hz.
mcu r -3- SECTION 6A
mcu fr
IC603A
AMPLIFIER
IC601B, IC602A, IC6028
ACTIVE FILTER
TONE OUT TO
TRANSMITTER
FIG 6A-7 BLOCK DIAGRAM
oy SECTION 6A
Onnoys | 3 best
aesi+eiW
“Ot mM, INV ISMMYIHLIO AHItIIdS LON SHOLSISIY
$319N
VOLLON
fOSud ~
voo voz
t9u - ore
O
Aaze
voe:
6204
MI
az9u
O92
wore
wOcEe
9294
isnrGy yor
NOILWIA30 @19n
3NOL
!
+3] SNVHL OL
vto991 2198-608) 4No 3NOL
coonr CO
*! *!
wESe wGoe
isnrov
Olud
FIG 6A-8 SCHEMATIC
SECTION 6A
mcu r
eal ©
9bO-bOS GYVOE SNOL SSOLD
TOP VIEW
~L céi0
Re2g.,. 1ce03 = 2 é
02 g on [ee xe REI! cegp e
oy ; R626 At it
20 nas R624
ner: ae HE T T
CR6O
Eg cols,
9v0-bOS GYVYOE ANOL SSOLO
T e603
6
BOTTOM VIEW
FIG 6A-9
mcu r -6- SECTION 6A
SQUELCH RS5O0Z
RECEIVER BOARD
U FICSIS
(e)
TPIO5
Fro,
ENCODER/DECODER Bo ‘R60!
|
ce pp Peo!
2D) REIS R6O!
ENCODER BD
Q)reie R6I2
| ENCODER/DECODER B0_R60I |
R728
—— [eed
(@Jreis (2) R62 12D
oe
ENCODER/DECODER 8D ‘
@)reis R601 ; a
eats
ENCODER 80 TONE ++ 4 PAIR
or OF (| T50!
60
| ENCODER/DECODER BO
(Q)reie R30! |
ENCODER BD _ TONE #5 PAIR
a Der ete ES ee
R60!
ENCODER /DECODER BD
: (Dre's F'60I
ENCODER BD pe oe #6 PAIR
TRANSMITTER BOARD lis
C505
MA-II6 & MA-I2|
6A-10 SETUP ADJUSTMENT LOCATIONS
mcu Fr
TOP VIEW
ae ey SECTION 6A
/
- - “yu o~ ate * Aone ‘
: alata MERE TR
¥ ;
4 2 “
ui ; a
;
= : : wok
:
i
oe
"
we DR i weal + Te.
=3 raat nnn alg na rrp ‘ , ine
. au Le Libel
ioe | :
= -- SRR eM he wanes
Fane be natn near ar ae “nade
i — a ks
U . ‘ Mi -
we
t 4 ty 4
. 4 |
;
= -
ans 2 , A
i a hg
{ : Ths
ee a meng psn et =e pep meee ee
. =a SERA See eRe
“ + %, : ba ;
y Ys * : a]
} 4 *
mene | , i 5
+ ) ¢ * ’
rere | %
¥ 4 i.
7 i. ‘3 |
"7 i. \ os : as
} : Na ’
f -
tr . >
‘ in A gem osm
ily ¢ ae
oe oe pantmeteeartinasd -_ —
| a ones ee a indi NS RI OS GE MNS ke RRR Aa
ve iSi-AM #8 aii-At
VOKTADOL TH
CVT utWel |
one verges
eee
SECTION 7
REPEATER CONTROL SYSTEM
mcu fr SECTION 7
a
; ‘ ‘ ak
| WOMQVSE one
ee ee ae ee ks aw he ne
my
M3IT2Y2 JOATNOD ASTAS¢SR
Lor
a
SECTION 7 REPEATER CONTROL SYSTEM
7-1 REPEATER CONTROL BOARD
An interconnection schematic of the repeater is shown in
Figure 7-10. The repeater control functions are performed by the
repeater control board, which is shown in detail on the inter con-
nection schematic. The control board components carry 700 series
numbers. Follow Figure 7-10 while reading the following.
The control board is arranged to permit operation of the re-
peater by noise squelch, or by CTCSS (Continuous Tone Controlled
Squelch, often abbreviated as "tone squelch") tones.
The U1OR repeater is equipped to hold seven different tone
decoders, three of these being accommodated on the repeater con-
trol board, and four on the auxiliary tone squelch board. Any
number up to seven may be installed, but the first one should be
installed in P706, located on the repeater control board. Simi-
larly, the repeater is equipped to hold seven different tone en-
coders, three on the repeater control board, and four on the aux-
iliary tone squelch board. Any number up to seven may be installed,
but the tone generator corresponding to the first tone encoder
should be installed in P705.
7-2 AUDIO PATHS
Audio from the receiver is fed to Pin L of the tone receiver
in the P706 receptacle. This audio contains both the speech and
the CTCSS tone portions of the received signal. An active high
pass filter removes those frequencies below about 300 Hz, which
includes the CTCSS tones and feeds the remaining signal (now
speech only) back to the receiver at Pin J. (In units not equipped
with tone squelch, a jumper located on the circuit board adjacent
to P701, provides a path between Pin J and L, and no low pass fil-
ter action is used.) This speech-only signal is then passed through
the noise squelch controlled amplifier in the receiver and fed to
the front panel volume control, R501. Audio from the arm of R501
is fed back to the receiver audio power amplifier and raised to
loudspeaker levels to operate the local loudspeaker. Thus, R501
controls the volume heard by the local operator and has no effect
on re-transmitted audio.
Receive audio, for retransmission, is taken from the high 1
side of R501, passed through the transmitter modulation input con-
trol, R728, and sent to the transmitter modulation circuits. Since
this audio has passed through the high pass filter in the tone
squelch board, it contains only speech components, and daes not
contain any CTCSS tone. If CTCSS tone is) used, .the..CTCSS. tone
for the retransmitted signal comes from the appropriate encoder
board, aS will be explained later.
sav ae DOOR -l- SECTION 7
7-3 TRANSMITTER ACTIVATION BY NOISE SQUELCH
When JU701 is connected to the "Squelch" contact pin, the
transmitter will be activated by any signal that is accepted by
the receiver's noise squelch system. When a signal is received
and the receiver's noise squelch system causes the receiver to be-
come unsquelched, audio amplifier Q113 in the receiver draws cur-
rent th.ough R501, the front panel volume control. This current
creates a drop across R727 that causes Q708 to conduct. Q708
causes Q707 to conduct, which places an effective ground on the
cathode of CR712, which causes Q709 to conduct, which then causes
Q@706 to conduct. Q706 places an effective ground on the PTT term-
inals of the transmitter, and therefore activates the transmitter.
Squelch Hysteresis Action:
When the transmitter is activated and Q709 is ina conducting
condition, Q709 causes Q710 to also be conducting, placing the
collector of Q710 near ground potential. The series combination
of CR729 -~d R675 are connected between the K Line to the receiver
squelc.. au. ue collector of Q710. When Q710 conducts, its collector,
acting through CR720 and R765, pulls the receiver squelch K line
toward ground, forcing the receiver noise squelch into a more
"unsquelched" condition. This action prevents the dropout of weaker
signals from mobiles when the mobiles pass through low signal areas.
The effect of this circuit is to add a large amount of "hysteresis"
to the operation of the squelch system. That is, the signal required
to hold the squelch open (once enercized) is thus less than that
required to open the squelch in the first place.
In some systems, it may be found that this "hysteresis" action
is excessive, and permits unduly noisy signals to hold the repeater
transmitter on. The amount of hysteresis action may be reduced by
increasing the size of R765.
7-4 TRANSMITTER ACTIVATION BY CTCSS (TONE SQUELCH)
When JU70L is connected to the "tone" contact Din, ptHeare—
ceiver noise squelch is no longer in control of the activation of
the transmitter. In this condition, tone decoders, tuned to spe-
cific subaudible tones, activate the transmitter when the appro-
priate tone is detected on a received signal.
To follow the operation under tone squelch (CTCSS) control,
assume that a tone decoder board for. 127.3 Hz had been installed
in the P706 connector of the repeater control board, and that a
tone encoder for the same frequency has been installed in. the; cor=
responding P705 connector, also on the repeater control board.
Also assume that JU703, a wire jumper on the circuit side of the
circuit board adjacent to P706, has been removed.
Unsquelched audio from the receiver is connected to Pin L of
all of the CTCSS tone receivers. When no tone is being received,
mcu xr -2- SECTION 7
Pin K of all tone receivers will have a positive voltage causing
Q702, Q705, Q706, Q802, Q804, Q806 to be conducting, and Q701,
0703, Q705, Q801, Q803 to be non-conducting. When a signal with
127.3 Hz tone is received, the 127.3 Hz tone receiver in P706 will
sense the presence of the tone, and the positive voltage will dis-
appear from its K terminal, causing Q706 to be non-conducting,
thereby causing Q705 to be conducting. Current pulled by the col-
lector of Q706 pulls current through LD703 and CR712, causing LD703
to light, and causing Q709 to conduct. The conduction of Q709
eventually causes the transmitter to be activated in the same man-
ner as it would be in the noise squelch operation mode described
earlier.
The conduction of Q709 also causes Q710 to conduct, placing
its collector near ground potential. The series combination of
CR720 and R675 are connected between the K line to the receiver
squelch. When Q710 conducts, its collector, acting through CR720
and R765, pulls the receiver squelch into a more "unsquelched"
condition. This action prevents the dropout of weaker signals
from mobiles when the mobiles pass through low signal areas.
When no CTCSS tones are received, the cathodes of CR709 and
CR710 are held at a positive voltage by R719. CR709 and CR710
constitute a diode switch. In this condition, the switch is open,
preventing the output of the tone encoder (Pin F, P705) from reach-
ing the transmitter tone input terminal F. Similar diode switches
prevent the output of other tone encoders from reaching the trans-
mitter tone input. When a 127.3 Hz tone is received, the action
of the tone receiver board located in P706, and the action of
9806 and Q705 cause the voltage on the cathodes of switch diodes.
CR709 and CR710 to disappear. The diodes are then forward biased
by current through R715 and R716, and therefore wikl.conduct.the
tone from the P705 tone generator to reach the tone input to the
transmitter.
7-5 OPERATION BY LOCAL MICROPHONE, PIT FUNCTION
The local microphone may be used for dispatching from the re-
peater location, or for testing the repeater station during main-
tenance procedures. The microphone supplied is a model MA-83.
This is a ceramic type microphone with a switch section that dis-
connects the microphone element when the PTT switch is released.
One pole of the microphone PTT switch is connected to Pin 3
of the microphone connector J501. Inside the transmitter, Pin 3
goes to the coil of the PTT relay. Since the other side of this
relay is connected to plus 13 volts, approximately 13 volts ap-
pears at Pin 3 of the microphone jack. This voltage acting through
CR718, causes Q718 to be conducting. When the PTT switch is closed,
the voltage at Pin 3 drops to zero, causing Q718 to become non-
conducting, which results in a positive voltage appearing on the
Q718 collector. This voltage, acting through R751, is connected to
mcu-r -3- SECTION 7
the base of the receiver noise rectifier filter, causing the
receiver to become squelched, and thereby preventing the retrans-~-
mission of any received audio during the time the local micro-
phone is depressed. :
If the repeater is equipped with tone, the tone select test
lead JU103 is normally connected to contact TP703. When the mi-
crophone button is depressed, TP703 is pulled almost to ground,
causing CR709 and CR710 to conduct, thereby permitting the tone
generated by the tone encoder in P705 to be delivered to the trans-
mitter tone input. Thus, the 127.3 Hz tone assumed above will be
transmitted when the local microphone switch is operated.
If it is desired to actuate other tones for test purposes,
the Tone Select lead JU103 may be connected to the appropriate
tone selection contact for the desired tone, i.e., TP701, TP702,
TP801, TP802, TP803, TP804. When the microphone PTT switch is
activated, the CTCSS tone associated with the selected contact
will be » citted. After the test, be sure to return JU103 to
TP703 for uo_mal operation.
7-6 TONE MONITORING PROVISIONS
Assuming that the tone select test lead is connected to TP703,
and that a 127.3 Hz tone decoder is plugged into P706, the posi-
tive voltage of Pin K of P702 (under the no-tone received condi-
tion), acting through R759 and R560 causes the diode audio switch
consisting of CR719 and CR720 to block audio from the arm of the
front panel volume control R501, preventing audio from reaching
the receiver audio power amplifier, and the local loudspeaker.
When a tone of 127.3 Hz is received, TP703 is no longer pos=
itive, and the diode audio switch CR719-CR720 is switched to the
pass condition, permitting the received audio signal to pass from
the arm of the front panel volume control to the receiver audio
power amplifier and thus the signal can be heard over the local
loudspeaker. Note that this received audio must pass through the
noise squelch circuit of the receiver as well as audio switch
CR719 and CR720.
The above has described the operation when the microphone is
in its grounded hanger. When the microphone is in its hanger,
only signals bearing the specific tone installed in P706 will be
heard in the loudspeaker. The microphone hang-up button is con-
nected through the microphone cable to Pin 5 of the microphone
connector J501, placing a ground on the base of Q717, which caus=-
es Q717 to be non-conductive. Under this condition, only the sig-
nals bearing the 127.3 Hz tone assumed above will be heard in the
local loudspeaker, as described above.
mcu r -4- SECTION 7
When the microphone is lifted from its hanger, the base of
Q717 is pulled positive by R749, causing Q717 to conduct, forcing
the diode switch CR719-CR720 to be in the pass condition, regard-
less of the voltage coming from TP703. Under this condition, re-
ferred to as the "MONITOR" condition, all audio signals that pass
through the receiver noise squelch system will be passed on to the
receiver audio amplifier and the local loudspeaker. This "MONITOR"
condition permits the operator to listen on the channel before
transmitting, and thus avoid Basis up an ongoing communication
on the channel.
Summarizing the action of the microphone hang-up button, and
its monitoring actions:
When the microphone is in its hanger, all received signals
with appropriate tone squelch frequencies (those for which a tone
decoder has been installed) will be retransmitted by the repeater,
but only those signals bearing one specific tone (selected by the
placement of the tone-select test lead, JU703) will be heard in
the local loudspeaker. This enables the local operator to avoid
being bothered by transmissions over the repeater which do not
concern him.
When the microphone is removed from its hanger, all received
Signals, regardless of whether they have the correct tone, or any
tone, will be heard in the local loudspeaker. This permits the
operator to monitor activity on the channel before transmitting.
7-7 THREE MINUTE TIMER, DROP-OUT DELAY, TIME-OUT WARNING OSCILLATOR
When the transmitter is not activated, 0709 is non-conducting,
causing Q710 to be non-conducting, causing Q711 to be conducting.
Since the collector of Q711 is shunted across timing con-
denser C708, C708 cannot be charged tkrough R735. When the trans-
mitter is activated by the receipt of a signal, Q710 is turned
on which makes Q711 non-conducting, thus removing the short a-
cross C708. C708 then is slowly charced through R735. When C708
becomes charged to about 1.2 volts, it. causes Q713 to conduct.
Once Q713 begins conduction, it turns on Q712 which puts more
base current into Q713, causing it to conduct heavily and turn
on Q714. Q714 acts as a short across the line leading to the base
CL y07L6,. cUrninguo 7 LoToLt. @cincer On. G collector 1s connected to
the PTT lead of the transmitter, the short it creates between
this lead and ground is removed, and the transmitter turns off
as soon as the drop-out delay capacitor C714 is discharged.
When Q713 becomes conductive, it also supplies collector cur-
rent to the time-out warning oscillator, Q715,. Q715 is connected
as a phase shift oscillator and its output is connected into the
transmitter modulation input. The beep from the time-out warning
oscillator is transmitted during the few seconds of the drop-out
mcu xr -5- SECTION” 7
delay caused by C714. C714, in the base circuit of Q716 serves
as a "drop-out delay." While the transmitter is turned on, C714
becomes charged. When the received signal disappears, the charge
on C714 holds Q716 in conduction for about two seconds. Thus, the
transmitter remains activated for about two seconds after the re-
ceived signal disappears.
mcu r -6- SECTION 7
TONE/CONTROL BOARD
504-005
7-8 REPEATER CONTROL BOARD TOP VIEW
SECTION 7
mcu fr
\
wed by CRLdL eee 28
} iz at ‘ oi] ut Lie 4
rad :
; w 5
tng
teat Par a W
5
4
haa a ial
a ‘a ‘
7 . 2, aie ieyee
ae ae ; ae
Ly, ban pe im z : 7 ¢ ‘
oh iat ae ie oo oi
- Withee Fin chm = oy 1 eter tere ia Fidy
ee 8 | pprtyet - mt Te ae
ee pet hy RD OY > Ee aE
ty i miapeetine ene ng th
ia te i f |
7 oie a ae fel |
Feast Bas Peas 54 aS f
ey ee a mele eet th —-
i
¢
TONE/CONTROL BOARD
504-005
7-9 REPEATER CONTROL BOARD BOTTOM VIEW
SECTION 7
mcu r
VA.
wm ; a? a) haw
or y 4 a }
Ly .
y an
a
ORAL Saas r
open d y ete-s * A SEED i | : tee ry
i koe mre oe ee a
- : ry e " ’
a) Hi , ay os : ae hj . ya
i ’ a ree ae i
if Be ] pe ; ¥ cana & |
“% singe 7 A
ane Sa be- “ran f 4
“s “yah . one 4 “ oe ae ; ‘ ;
j oak = % Rin. : on
f : 2 Ls
‘ ee Ager Da 7 or = 5 [S : ad ‘ Pca ‘,
picky TS Ge ta is i a phy
ae pilin dba ath ph AR lh linear on, Lear ep ee
hi gs earn a ;
land “* oe auth P 4 uf ™ .
a a 4 t y a
ee 4
ce ae x ;
non ox a ‘
a oo “ns Aram putes vz
“> ay is yt ¥
ch yy - ' }
eee bua ole ert
wor: ae, rg Oa he
ev ihe F ee a hee Si
a ee
ee ~
vr
a Bi ogh: 78H
" er a
Aa
ie oe a: ab + ‘ J
bo. CR GT RS SS " Le
—_— a ee
|
ry }
t % |; h “
i ; Be a
rt se ae ots. “15 sea — a. Ay : e
Y & okies &
Pa pts ate
“ee . . eile ‘ yrenti i—<
F Bi eh as
(Fa 4 ae ye 4 saat
a 7 4 pt al
beat alt) Pentti EST
tae re
nv oe
4 "Be oe ¢: ta. Al
pat cy Woshhay el, sk oa)
¥
Be - 130
> ig
CR7I6
JU 2 ‘
aS <
Ws ) \. DISABLE
a709 R747 ;
| R7, OO
2 (-%SPS1593
©) a c7i4l+
R730 100 T
C710
C7 c7i2
> | R745 C713
cP7l2
03
TONE SELECT 7
TEST LEAD
7-10 REPEATER INTERCONNECTION SCHEMATIC
INCLUDING REPEATER CONTROL BOARD
r a SECTION 7
2 See CAT
OeaO8 pial hc athe
boda =o re am i+
{ ay i
, A eet Hy ye r 4 '
7 - ee = t ¢
Phi ? bs y! ) Joa
: : ' ‘ eau ‘ " ‘
; te - fi
Vie & iy A Pe 2p
On ney
dpe toe Ls a ad
rae « LA
a Astle, } ss de 7
; ee ila \ -
Ss ret 2 ath ;
eS 90 :
er ae ¥ re
Bo) ts Gite o |
A ypgahyae ae oe sed Satemitce ane e ii Y
fa a or : Fs a i . m Ss
‘ ; 5% i fad tant ee f 4) ‘
+2 ~ eee "s : eh :
i gh ‘ ay :
be . “sh ay 7 et) ‘vy id “ ; c aes ae i \ al
ue * a -, a ah iS ity
a) Oye ’ Ree ' ie
1 a Scant cia * 4) + iy 2 LT 5 Bera a ‘ . 4
Ay ‘ mil Agen a ie i oft
ah ry ¥ LsAvagan § wails i A
5 salad “a4 Gbiey ’ k
ae va re ts. 12 :
'- 5. oe i ba Tr ‘ 3
abo . y etait aT
Pgh P hae as aI t i
—— ya Pe “bare a
* te om a De
re ee
wh - pe one ey . y ay
ee Se a oe ae: ane :
+ & it x ‘ A ee a an,
i / i" a »
a “ =" e , ma és } on
~ hee teh “at
j \ y i | RE
' " Bech gd UN
= + } i k a 4. : REO
; = ire:
——
AES, hu TE an . oe SPS1593
P707 as R727
SQUELCH, 7
P708 ory
TRANSMIT
ey su72 ,7°~ P709
T¥ ait a ¢
ANTENNA a Ri TX BUARD \ a
CONNECTOR REF SCHEMATIC
[| ts |
FT.LOS
SS yh P701 P703 P704 P705 P706
- CR708
ee ere:
R4016
“0's. | ® ®
| LD401, TRANSMIT ae
| |NDICATOR 7 t77® &)
TP702
Le ea
a RIOT
we 4
N/OFF INDICATOR —
SOARD © oe E
© © TIME OUT CIRCUIT
€)
SS) —
Q703 =
® A
‘govac TJ @)
IEF TZ =
©
|
ON/orF | @
| INDICATOR’
| r= | eee SS =
|
| J502
en FS9! on
| eV t5% NTENN
SCOMW | CONNECTOR Rr BORD
= oe 25 REF SCHEMATIC
. = | FICSIS 604-01!
| POWER SUPPLY REGULATOR BOARD | J.001
M a
TPIOS _JFTCSIS
TONE SELECT
Test LEAD ell
10K 1OK
NOTES
ALL RESISTORS 4 W UNLESS OTHERWISE NOTED.
ALL CAPACITORS ARE MICROFARADS UNLESS OTHERWISE NOTED.
(<— DENOTES ADJUSTABLE COMPONENTS.
HEAVY LINE DENOTES APPARENT SIGNAL FLOW.
ALL VOLTAGES (FIGURES IN PARENTHESIS) ARE NOMINAL VALUES
AS MEASURED WITH A VTVM. SUPPLY VOLTAGE =II7VAC 60HZ
AT INPUT TO SUPPLY CABLE.
6. PART DESIGNATION NUMBERS INDICATE LOCATION.
100 SERIES Rx BOARD REF SCHEMATIC 604-OI!.
200 SERIES Tx BOARD REF SCHEMATIC 604-010.
BOO SERIES UNASSIGNED.
400 SERIES
(a) POWER SUPPLY REGULATOR BOARD
(b) ON/OFF INDICATOR BOARD.
500 SERIES CHASSIS MOUNTED.
600 SERIES
(a) TONE PLUG-IN MODULE (ENCODE /DECODE) REF SCHEMATIC 5OI-275
(b) TONE PLUG-IN MODULE (ENCODE ONLY) REF SCHEMATIC. 304-007.
700 SERIES TONE CONTROL BOARD.
900 SERIES TONE MOTHER BOARD REF SCHEMATIC 604-009
Vary
7-10 REPEATER INTERCONNECTION SCHEMATIC
INCLUDING REPEATER CONTROL BOARD
meu r -9- SECTION 7
' »
ee ay
ma Set 4
>
: - ; — oe
~~ & a. - - ee
P P on 7]
Mares
= ; oun = |
Ho 50 teh oar?
at a 1
j } :
} bene .
' ) j ' . \ mt
; :
cjsunenbiintiagaa bie H baal
om
od) 3
a mm dina
eh
wore >
oR? ' Ais
‘ = ~-
* . A
~4 4 a ww?
3 & Moe y i oth
= “
.Y 2 7 %
+
¢ a3) 1
I ; ~}
a HT.
of — se
¥ ‘.
ia
Chabon) ’ .Y
: hoa
; i
ne at)
we
B ~ ss
—_"* Pia Rb
3
ver toner Fe | ;
_ ~ - - Sek rf¥e ne ate OP Fim rte oy POH ene” ii i]
: t =;
| eee | ¥.
t bx Peay * it cx a bet gery an 4
; > Bs ey ao ting i ,
: 14 74 aadied nm} o 4 —— > _ ts Pf
a y ;
Pee | } j q Oe de 4
e Fa i. i i} U
rh * 1 i ie © j
i“ ’
~ (
' ’ ad dy how! ythete J ~
: A ee
« : aie
-—-— ~ _ ne aid — en ae
emai pees onesie
Stele
eo ae
= i — ot
Ts
faa} ; f tees Sneed +0 2h hee t
neal a% :
tt ‘ ; ae
eo te , A eOePT gh. MP yo tet
} } ‘ 4 ep 4 x a
: bay Jae FG ; sw
fe A ,
SATs SPRAY Vie so a
OF
Qh
= 4
OF
oO
a
rT)
x
=
oO
=}
WW
z
oO
t-
504-009
nN
SPIT NN SH SRNR OY OY RR ERS PR a
ayiaeat:
ss
vO8d,
2p OR Rete aI ER Sa ph I 7 es MN NR
A OD
et
7-11 AUXILIARY TONE BOARD TOP VIEW
SECTION 7
-|0-
mcu r
om i)
9)
\
.
.
wei
y
“a
oto,
Bi Fe
_ ;
ta
©
area |
¥ 90T ©
Sh
7
+ &
i
U - ‘
'
;
Mente
t
‘F rr
,
a |
i
4 ci
i
ie
’
- a
ta.
4 ~ Ww
' 5
ge
' iy ’ ‘
i “ ot
: alt
- mao
? ee ee
a 4
; ~ s
4 4
* iv
. ‘
- i + Ab eel
4 a 4 ae «+
‘ te ,
Uy oi :
, ie :
‘ ee ee
«
, +? Shit es Oe eM or
4 bei Cw Pa RUE ice
a
TONE MOTHER BOARD
504-009
Peres
pr QOOd wom GORE,
RET EE PLES.
ss
7-12 AUXILIARY TONE BOARD BOTTOM VIEW
SECTION 7
mcu r
he
—
i
th.