Document text
A
eae ELECTRONICS INC.
SERVICE MANUAL
Micro~com ullb
TRANSMer
*
- = TRANSCEIVER
MODEL MICRO COM UIIB, UI4
Oia £ MM. TRANSCEIVERS
7707 RECORDS STREET
INDIANAPOLIS, INDIANA
PRINTED IN U.S.A,
4-76
9.00
she
MICRO-COM U11B and MICRO-COM U14B
SERVICE MANUAL
CONTENTS
SECTION 1 GENERAL INFORMATION
1-1 Description
1-2 Specifications
1-3 Equipment Supplied
1-4 Equipment Not Supplied
1-5 Installation
1-6 Operation
1-7 Crystal Specifications
1-8 Crystal Installation
1-9 Crystal Heating Detail - U11B
1-10 Crystal Heating Detail - U14B
1-11 Crystal Location and Adjustment Diagram
SEClLTON=2) CERCUIT DESCRIPTIONS
2-1 Receiver Board
2-2 Transmitter Board
2-3 Regulated Power Supply Circuit Description
2-4 Receiver Block Diagram
2-5 Transmitter Block Diagram
SECTION 3 ALIGNMENT AND TUNING PROCEDURES
3-1 Regulated Voltage Supply Adjustment
3-2 Receiver Alignment Chart
3-3 Receiver Alignment Locations
3-4 Transmitter Tuning Chart
3-5 Transmitter Tuning Locations
SECTION 4 DIAGRAMS, VOLTAGE DATA, SCHEMATIC
Regulator Board Top View
Regulator Board Bottom View
Receiver Board Top View
Receiver Board Bottom View
Transmitter Board Top View
Transmitter Board Bottom View
Setup Adjustments Locations-Top View
Setup Adjustments Locations-Bottom View
Setup Adjustments Locations-—Rear View.
SPAR el
OMAN AU BPBPWN FE
4-10 Voltage Data
4-11 Schematic
SECTION 5 PARTS LIST
1 Regulator Board
2 Receiver Board
-3 Transmitter Board
4 Chassis Assembly
SECTION 6 TONE SQUELCH OPTION
6-1 General Description
6-2 Circuit Description (Tone Receiving Condition)
6-3 Circuit Description (Transmitting Monitoring Condition)
6-4 Tone Module Block Diagram
6-5 Tone Board Top View
6-6 Tone Board Bottom View
6-7 Schematic
6-8 Parts List
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GENERAL INFORMATION
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SECTION 1 GENERAL INFORMATION
1-1 DESCRIPTION
The Regency MICRO-COM U11B and MICRO-COM U14B are FM Base
Station transceivers designed for use in the UHF, 450 to 470 MHz,
Land Mobile Communications bands. The U11B and U14B are respec-
tively, one and four channel versions of the same transceiver de-
sign.
Continuous Tone Squelch Circuitry is available as an option
with all of the series. The tone squelch option provides for
channel monitoring, which is initiated by an auxiliary switch on
the microphone.
The receiver section is certified under Part 15, Subpart c
of the FCC Rules. The transmitter is Type Accepted under the
following FCC Rules parts:
21 Domestic Public Radio Services
89 Public Safety Radio Services
91 Industrial Radio Services
93 Land Transportation Radio Services
95 Citizens (Class A) Radio Services
1-2 SPECIFICATIONS
RECEIVER
Bile icine (an Corum trates. meade se eee 50 Ohms
Channels
MECRO=COM BULL Devire ee fereetere nt. ener, fo, eee 1 Crystal Controlled
MLCRO=COMSUUe DB vecmsu, & ae temetae ett. kg. oon oe 4 Crystal Controlled
BLCGUCH CV= Range sorts errant ee oS 6A ee 450-470 MHz
Maximum Channel Spacing....... 1.0%, with 3 DB degradation
Serle Lill CVn Getta. ncn ie Svea eee ame 2 -39uV, 120) DB Sinad
-50uV, 20 DB Quieting
-25uV, Carrier Squelch Opening
-25uV, Tone Squelch Opening
SSSI AN IES SES Aas Pen eis Car OR CIE ALA Dien 75 DB @ 26 KHz
SVSVEWSTLG IEE) EV SSE SA UTCTS aa ee oes ish race Pn 75 DB
mcu B | aie SECTION |
Intermodulation#Rejection. .1. 2. «- 2 + < che eee mee. 70 DB
Modulation (Acceptance ie ci .ta cir custo ie rhitts teten tere eee a 7s KHZ
Frequency. Stabiiicy.. «Ae +.00025%, -30°C to +60°C
Audio. Response. sere ce «eee 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
Va Te cists wakes eee ite carer eae at 4 watts @ 5% distortion
Maximum Audio Output Power...... 5 watts @ 10% distortion
Piok sOV Seman. ences Double Conversion 10.7 MHz - 455 MHz
Part 15 FCC Certified
TRANSMITTER
Antenna EMPGCdanGes t crsec ie i dicw wie c econ ert ete eee 50 Ohms
Channels
MECGRO=COM. UE De peewee ra ene. ban site ayn coe 1 Crystal Controlled
MECRO-COMEPU Later eiore typos tayers: 30s cc cicuarees \ 4 Crystal Controlled
Frequency »Range@. 15.1. Sy Akira ate Pre eaters c wenereueee 450-470 MHz
Channel Spacing (1 DB power degradation).......... 6 MHz
POWGED.OUEDUT sf oparnte eres eeu a cet cc dae ees 10 Watts (minimum)
Output Frequency Stability... ... +.00025%, -30°C to +60°C
Spurious ‘& Harmonic: Rejection... ...4-. +e 60 DB
Power, Un Lt Protect lone eerie ere an ee Temperature Limiting
Power Control Circuit
ich Wb ESB Ro) « Wire Perna re A 5c I Ain A a ol Pearce e 16F3
Mi CrOpPhOne sts... os ee High Impedance Plug-in Ceramic
mcu B -2- SECTION
Die UN aeers LCM) cedars toviens, 2. chases acct ee \eue ie sie Frequency Modulation with
Automatic Deviation Limiting
Bee VUNG OL) She eco ste so ol ces) oe Factory Adjusted to +5 KHz (max.)
MieomreCCONCNICY DTS COMO wea. se een ess 6 fee os ec se secs 4 es 10%
PPimtuimeanCaNO ls Caliey cl ersitcctutete oe na iciciois eve a elete! eleiere ss -60 DB
Audio Frequency Response.... From 300 to 3000 Hz, within +l
and -3 DB of a 6 DB per octave
pre-emphasis characteristic as
referred to the 1,000 Hz level
POWER
Power Requirements........... 117 AC, 60 cycles (nominal)
ReGomve"CONALCION.,.-s s.* ss SOME Te SURES erotic tele one Shares - 15 Amps
Hiei ESTP MOT LOMI A Vane nas ofits tanctcls fe terete eveete ethene e -8 Amps (max. )
Miers Gas Ay oes Miia encit ates ON aS FR oe eee ee 2 Amps, 3AG
GENERAL FEATURES
PMOT embane lot ewer ee canes tis sie 4 cee nbete sis 0° na 385/ Sexes
Depth (Including Knobs)..... a ero lee! FS aya, eaters Se 374e
We loom COMO Vete pp run timrrete ete ta res ode o/6. eis! 6ic tess cee 122/72 nbbS.
SDSL seston. ete ave falar en crene 3 1/2" Square, 3.2 Ohm Impedance
EQUIPMENT SUPPLIED
- Transceiver unit
- Microphone and Connector
- AC Power Cord
- Owner's Instruction Manual
ell ell oe
EQUIPMENT NOT SUPPLIED
1 - Antenna
1 - Coaxial Cable feedline
1 - Coaxial Cable connector
mcu B i SECTION
1-5 INSTALLATION
The antenna used should be of a design to properly match the
50 ohm output of the transmitter. A high SWR will decrease the
power output of the transmitter, and impair the sensitivity of the
receiver. The antenna installation and its cable should be checked
with a SWR bridge.
A connector socket is provided for the use of an external
loudspeaker. The use of a 3 to 4 ohm speaker is recommended for
best performance. (Regency Electronics, Inc., Auxiliary Speaker
Model MA-8) The internal loudspeaker connections are on pins #1
and #2 of the external loudspeaker plug.
1-6 OPERATION
On-Off Switch:
The power On-Off switch is located in the upper center por-
tion of the front panel. The switch is of the Push On-Push Off
variety.
Volume Control:
The volume control is of the slider type. Sliding the knob
upward increases the volume, sliding it downward decreases volume.
The volume control affects only the volume of received Signals as
heard in the loudspeaker. It does not affect the volume of the
transmitted signals. |
Squelch Control:
This control eliminates background noise in the absence of a
Signal. Sliding the knob all the way down removes all Squelch ac-
tion. Sliding the knob upward until the noise disappears permits
the receiver tobe quiet until an actual signal is received. Best
performance is obtained when the squelch control is adjusted in
the quiet portion of its travel, just adjacent to the point at
which the noise appears.
In units equipped with Tone Squelch, the "Monitor" bar on the
microphone must be held down while adjusting the squelch control.
An improperly adjusted squelch control, i.e., with the con-
trol adjusted too far into the quiet portion of its travel, can
cause the receiver to miss some weak signals.
mcu B =.4— SECTION |
Tone Squelch Monitoring Function: (For units equipped with Tone
Squelch)
When the "Monitor" bar onthe microphone is in the "up" posi-
tion, the Tone Squelch System is effective and only signals from
stations having the appropriate tone will be heard.
On shared radio channels, it is considered good manners to
listen on the channel before transmitting. When the "Monitor"
bar on the microphone is held down, the Tone Squelch circuits are
placed in the MONITOR condition, and any signal on the channel
will be heard regardless of whether it has the appropriate tone
SoaiLng :
Consequently, you should press the "Monitor" bar down, and
listen to the channel for a moment before transmitting, to assure
yourself that someone else is not using the channel.
U14B Channel Selector Buttons:
The U14B is capable of two-way communications on multiple
discrete, crystal-controlled frequencies, or channels. Selection
of the desired channel is accomplished by pressing the correspond-
ing channel selector button on the front panel of the unit. The
radio will neither receive nor transmit unless one of these but-
tons is depressed.
NOTE: DO NOT push more than one channel selector switch
button at a time.
Indicator Lamps:
Two pilot lamps are located on the front panel of the unit.
The Green pilot lamp indicates whether the unit is turned on or
off. The Red Lamp glows whenever the transmitter is keyed on
(activated).
Microphone:
A high-impedance, desk style, ceramic microphone is supplied
with the unit. To install the microphone on the radio set, in-
sert the connector plug into its socket in the front of the radio,
and lock it into place by rotating the locking ring 4% turn clock-
wise.
To transmit a message, it is only necessary to press the
Transmit button on the microphone and speak into the microphone.
mcu B me ae SECTION |
The Transmit Indicator will come on to Signify that the trans-
mitter is operating.
Best results 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 a normal 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 compe-
tent technician with appropriate test equipment. Instructions
for the necessary adjustments are included in the receiver align-
ment 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 heater which is 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, (Figures 1-9, 1-10) demon-—
Strates the correct method of crystal installation. ine erysteal
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.
mouse =6r SECTION |
HEATING ELEMENT
THERMISTOR j}+-— CRYSTAL
P.C. BOARD
I-9 CRYSTAL HEATING DETAIL UIIB
HEATING ELEMENT
CRYSTAL
7—— THERMISTOR
P.C. BOARD
mcu B -[- SECTION |
TRANSMIT CRYSTAL
NETTING INDUCTORS
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GED?
= >»
TRANSMIT CRYSTAL
Ff | POSITIONS
RECEIVE CRYSTAL
NETTING INDUCTORS
a= ©)
(@) ©
CEES Gra)
= ames) cn
RECEIVE CRYSTAL
POSITIONS
I-11 CRYSTAL LOCATION AND ADJUSTMENT DIAGRAM
(WRAP REMOVED)
mcu B -8- SECTION 1
SECTION 2
CIRCUIT DESCRIPTIONS
mcuB SECTION 2
ie
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~~
—*.-
SECTION 2 CIRCUIT DESCRIPTION
2-1 RECEIVER BOARD
The entire receiver is mounted onthe 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, J-FET mixer.
L.O. (Local Oscillator) injection for the J-FET mixer Q106
is ata frequency of 10.7 MHz lower than the incoming signal fre-
quency. It is obtained from a crystal oscillator -multiplier
Sato a CONS tsocing oLOLOl, OLO2,) 6103, and 0104" 0101 is a crys-
tal oscillator, using third overtone crystals in the 48.8 to
55.7 MHz range. Pe mule frequency sunits), the jactive serystals
are selected by the use of switching diodes CRI102A, B, CGyaandmeps
The output circuit of Q101 oscillator is tuned to the third har-
monic of the crystal frequency, and this harmonic is amplified
by a buffer-amplifier consisting of 9102 and Q103. 0103 drives
Q104, which operates as a frequency tripler, providing the want-
ed local oscillator injection frequency. This wanted injection
frequency is separated from various harmonics and subharmonics
by the L114 and L115 section of the helical filter and delivered
to the source of the mixer, Q106.
PeTOutpuc .of OL0G consists of a 10.7) (MHz IF Signal which
is fed to a six-pole monolithic crystal filter, consisting of
FLIO1, FL102, and FL103. This filter provides most of the adja-
cent channel selectivity of the radio. The signal is then am-
plified by integrated circuit, ICl01, and fed to integrated cir-
cuit, IC102, which contains another amplifier for 10.7 MHz, the
second mixer circuitry and the second L-.o. circuitry, operating
at 10.245 MHz.
Dhiema oo oKH2 OUuCcDUte GlelClO2e (terminal -5) is coupled through
a tuned circuit tothe 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 FL10O4 is am-
plified and coupled through a tuned circuit to the MputwoOpe nee
grated circuit ICl03. 1C103 is a series of amplifiers providing
approximately 60 DB gain at 455 KHz. Also included in IC103 is
the limiting circuitry and a quadrature detector circuit. Tek 23%,
connected between terminals 2 and 12 of ICl03, is the adjustable
quadrature coil.
meu B -[- SECTION 9
The audio output from IC103 (terminal 1) is coupled to the
input of the audio amplifier circuit and to the input of the
noise-operated squelch circuit.
Transistor Q110 is an amplifier whose 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 Q111. Q111 is used as a detector which rectifies
the amplified noise and produces a DC voltage at its collector,
When the DC voltage at the collector of Q111 is positive and of
Sufficient value to provide base bias for Oll2, 10112. turnsson
and provides essentially a short circuit between the emitter and
base of Q113 thereby squelching the audio output from the receiv-
er. Whenasignal carrier arrives, the noise input, to: the detec.
tor (Q111) 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
audio output of the unit is heard. With the audio preamplifier
(0113) operating normally, audio is applied through the volume
control to the input of the audio amplifier, ICl04. Q113 sup-
plies a signal to the audio amplifier ICl104, which amplifies the
audio to loudspeaker level.
2-2 TRANSMITTER BOARD
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 ceramic microphone, and Supplies pre-empha-
Sis and amplification prior to the modulation limiting circuit
which consists of CR210 and CR211. IC201B 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
Q201 serves. as the crystal oscillator, using. crystale cat
1/36 of the channel frequency. The crystals are fundamental cuts,
mcu B -2- SECTION 2
in the frequency range 12.5 to 14.3 MHz.
In multiple channel radios, the appropriate frequency is
chosen by applying a positive voltage to the appropriate switch-
PasmaLOCe a CRZ02A UB Gor).
Direct frequency modulation of the crystals is obtained by
applying the modulation signals from the audio section to var-
acronu modulator diodes, .CR201IA,/B; .C,..and D:
FREQUENCY MULTIPLIER SYSTEM
TReBMOUCDUL Omelheuchyscalsoscillatonr, O20l,7 iasstuned to three
times the crystal frequency, and this signal is amplified by buf-
fer-amplifier Q202, then delivered to the tripler circuit, 0203,
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 dou-
bler Q205 develops about 150 milliwatts of power to drive the pow-
er output module Ic5sol.
POWER OUTPUT SECTION
The packaged power output module, IC501, contains three cas-
Gatiedestages Or power amplification. Tts gain, and therefore its
power output, can be controlled over certain limits by the power
SOnLLO =clrCurtrconsiscting ObeuR227 and 0206, 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
possible damage through overheating, a thermal protection circuit
2eeinetuded R120) is vaithermistormthat rapidly increases .in re-—
sistance as its temperature reaches certain levels. RT201 is at-
Pachea to one cry thenmounting bolts on 10501. When the tempera-
ture approaches excessive levels, RT201 increases in resistance,
thereby reducing the voltage supplied to IC501 by the power con-
LOL meer cut ts
2-3 REGULATED POWER SUPPLY CIRCUIT DESCRIPTION
The circuit diagram of the power supply is shown as a part
of the overall transceiver schematic, in Section 4.
The power supply transformer T501 transforms the 117 VAC line
voltage to 38 VAC, center tapped, at the secondary. Rectifiers
CR50T, CR502, CR503, CR504 and filter capacitor C503, rectify and
mcu B -3- SECTION 2
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 toa 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 drainonQ50l1, causing the output voltage, and conse-
quently the sample voltage, to drop slightly. The reduction of
base-emitter voltage of Q402 would cause aslight decrease in col-
lector current which in turn would increase drive to Q401 (through
R402). Q401 would then increase the base current to Q501 causing
it to supply more current to the load 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.
mcuB -4- SECTION 2
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2-5 TRANSMITTER BLOCK DIAGRAM
SECTION 2
mcu B
SECTION 3
ALIGNMENT & TUNING PROCEDURES
mcuB SECTION 3
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REGULATED VOLTAGE SUPPLY
ADJUSTMENT PROCEDURES
During Adjustment, Do NOT Press The
Transmit Key On The Microphone
EXPECTED READING
SIGNAL SOURCE OBSERVE ADJUST AND NOTES
None Required } Indicated End El Adjust R405 This Adjusts Out-
Of R404,Use DC|To Obtain 13.0 put of Voltage
VTVM VDC At Indicated Regulator Under
End Of R404 Receive (Standby)
Conditions
OBSERVE VOLTAGE READING
AT THIS END
[@®
3-! REGULATED VOLTAGE POWER SUPPLY ADJUSTMENT
mcu B -[- SECTION 3
mcu B
10.7 MHz Signal Gener- TP103,using DC VTVM
ator, unmodulated. Con-
nect Signal Generator
to Drain of Q106,using
a series 10,000 ohm
y resistor.
Not
alignment .
TP104,using DC VTVM
TP105,using DC VIVM
necessary if radio has not been
Preliminary I.F.
badly misaligned.
None Required TP101,using DC VTVM
TP102,using DC VTVM
Signal generator source TP105, using
capable of being set
to within +.00025% of
channel frequency. Set
signal generator output
channel frequency.Mod-
ulate generator with a
1000 Hertz tone,with
+3 KHz peak modulation
deviation. On Multiple
channel radio,do align-
ment on channel #1.
TP103,using DC VTIVM
Reduce signal genera-
tor output to zero
signal. If generator
attenuator does not
permit signal to be
reduced below receiver
noise level, disconnect
signal generator from
antenna jack.
TP104,using DC VTVM
TP105,using DC VTVM
Bring signal generator
attenuator up to a
level that gives a
good, quieting, signal. Be
sure signal generator
is accurately set to
channel frequency.
TP105,using DC VTVM
Signal generator,as
above,tuned to exact
channel frequency,and
modulated by a 1000 Hz
tone,with a peak modu-
lation deviation of
3 KHz.
Distortion meter,con-
nected to loudspeaker
terminals. Follow usual
distortion meter pro-
cedures for setting
null and level controls.
If a distortion meter
is not available,this
step may be accomplished
by observing the 1,000
cycle signal on the
loudspeaker terminals
with an oscilloscope,
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 re-
sult in a peaked re-
sponse from the crystal
filter and poor weak
signal performance.
(Optional)
Final touch up for
optimum sensitivity
Signal generator,as
above,be sure it has
not drifted off chan-
nel.
Final discrim-—
inator & AFC
RECEIVER ALIGNMENT PROCEDURE
During the receiver alignment procedure, set the squelch control to maximum counter clockwise position,
(i.e.,unsquelched). Set volume control to comfortable listening level.
cycle tone during the alignment procedure helps to avoid alignment errors.
Adjust. L119,L120,T101
(top and bottom slugs)
for maximum TP103 volt-
age.
Listening to received 1,000
Expected Reading, Notes
Adjust signal generator
output level to obtain a
-3 volts positive read-
ing at TP103.As alignment
Progresses,reduce signal
level to maintain the .3
volts reading.
Adjust L123 to obtain
a +4.5 volts reading at
TP104.
This is a discriminator
adjustment.TP104 voltage
should swing through the
4.8 volts value as L123
is tuned.
Adjust R132 to obtain
+4.0 volts reading at
TP105.
Tune L104 for minimum
positive or maximum
negative reading on
TP10l.
Tune L107 for maximum
negative reading on
TP102.
If the channel frequen-
cy is below 467 MHz,set
the aluminum core on
L111 even with the top
of the coil form.If the
channel frequency is a-
bove 467 MHz,set the
aluminum core on L1ll
all the way to the bot-
tom of the coil form.
Once set,it is not nec-—
essary to adjust L1ll
during the tuning pro-
cedure.
Adjust L101A to obtain
+4.0 volts reading on
TP1O5.
This adjusts output of
AFC amplifier to be at
+4.0 volts when receiv-
ing an on-channel signal.
() Eseiaines “itohersy, Wee
volts indicates oscilla-
tor is not oscillating.
=.i2 to =.4 volts.
This is the receiver fre-
quency adjustment.TP105
reading should swing
through the 5.0 volts
setting as L101 is ad-
justed.
Adjust L109,L110,1112,
B113,L114,5115,L119,
L120,and T101 top and
bottom slugs for max-
imum reading at TP103.
Adjust L123 to obtain
4.5 volts reading at
TP104.
As alignment progresses,
reduce signal generator
output level to maintain
about .3 volts output at
TP103.
This adjusts discrimi-
nator to center of re-
ceiver bandpass.
Adjust R132 to obtain
+4.0 volts reading at
TPLOS.
Adjust L101A to obtain
+4.0 volts reading on
TP105.0On multiple chan-
nel receivers, repeat
this in channels 2,3,and
4,adjusting L101B,C,and
D respectively.
Adjust L109,L110,4112,
L113,L114,L115,L119,1L120
T101(top and bottom) .
Repeat step [7] on each
channel with a strong
signal.
3-2 RECEIVER ALIGNMENT CHART
—2?2-4
This adjusts AFC voltage
to center value when no
signal received.
This adjusts receiver
local oscillator chain
to proper center frequen-—
cy.
During this procedure
keep signal level from
the signal generator at
a value sufficient to ob-
tain a -12 db(25%) reading
on the distortion meter.
Remember that this is a
"touch up" type of adjust-
ment.None of the adjust-—
ments should be moved more
than a small amount from
the setting previously
obtained.
SECTION 3
Ae
eel
sf 0 ougen
Sus i: 0 Wey
Us sof Qi —
| 6ESS3 3h tes
> TP 105 : ooYy4
a ears
Guia
me
= pes :
OS ‘ia zs
TP 102 . ROT (P : Ox ae
TP 101 3 J. BOGS _ @
ORF
S07 ais)
R132
3-3 RECEIVER ALIGNMENT LOCATIONS
mcu B =
SECTION 3
Test Meter
mcu B
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
Ground lead on chassis
Note: a 20,000 ohm per
volt multimeter,on the
2.5 or 5 volts scale
may be used for these
Proceedings. Readings
will be 20% lower than
those given here on 2.5
volt scale,and 10% lower
on 5 volt scale.
RF power meter, con-
nected to antenna jack,
Frequency meter, FM mon-
itor or counter, with
+ .00025% accuracy.
FM Modulation Monitor
L201,and L205. L204 for +.55 volts,no drive
minimum positive voltage 4+..4.16O —2.3) VOLES mor=
reading (or maximum nega- mal. A false peak on
tive if TP2 goes negative). L205 is possible, look
for biggest one.
L207 and L208 for minimum +.5 volts, no drive
positive (or maximum neg- +125 to -,3 volts nor-
ative) voltage reading. mal.
Then touch up L205 for
maximum negative voltage
reading.
2 LO 2a waeeemeore nega- no drive
tive voltage reading. Then -4 volts nor-
touch up L208 for maximum
negative reading.
L214,L215 and ¢231 for no drive
Maximum negative reading. -9 volts nor-
Then touch up L212 for
maximum negative reading.
C233;,/6235;,,C237) form max= Q volts, no drive
imum negative reading. -3 to —5 volts normal.
Then touch up L247 215),
C235 for maximum negative
reading. \
RF power output R227 to 10 watts output 10 watts normal.
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.
Switch te channel #1 and adjust L201A to exact channel frequency. Then switch to
channels 2,3, and 4, and adjust L201B, L201C, and L201D respectively to exact channel
frequency. If either L201A,B,C,D have been changed appreciably during this step, go
back and repeat the frequency setting on all channels.
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 cTcCSS
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.
3-4 TRANSMITTER TUNING CHART
“Ae SECTION
om
ale
SS)
[6]
R227
TP205
[5]
6237
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S)
Sh
L2046 WS)
L20
Li J2] 5S
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[2] ae
L2075 F 4] 5)
ot |
L208 ane
TP202
TP203
un
[3] (3]4]
L210 ali
aoe
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3-5 TRANSMITTER TUNING LOCATIONS
mcu B lel
SECTION 3
SECTION 4
DIAGRAMS
VOLTAGE DATA
SCHEMATIC
mcuB
SECTION 4
4
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REGULATOR BD 302-032
4-1 REGULATOR BOARD TOP VIEW
REGULATOR BD 302-032
4-2 REGULATOR BOARD BOTTOM VIEW
mcu B -|- SECTION 4
mcu B-
RECEIVER BOARD
4-3 RECEIVER BOARD TOP VIEW
-O-
SECTION 4 ~
(@
RECEIVER BOARD 501-236
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4-4 RECEIVER BOARD BOTTOM VIEW
muB ts Be SECTION 4
mcu B
TRANSMITTER BOARD 50I- 235
4-5 TRANSMITTER BOARD TOP VIEW
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SECTION 4
(@
TRANSMITTER BOARD
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4-6 TRANSMITTER BOARD BOTTOM VIEW
mcu B ota SECTION 4
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4-7 TOP VIEW
SETUP ADJUSTMENT LOCATIONS
SECTION 4
mcu B
(AINO 9PvIN)
S3SHOLIMS NOLLNGHSNd
YOLOSNNOD oie 193573S ee
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SETUP ADJUSTMENT LOCATIONS
4-
SECTION 4
mcu B
VNN3ILNV
YOLIINNOD
Y3ANVIdS
TWNYSLX3 20Sr
YOLIANNOOD
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AYVITIXAY
4-9 REAR VIEW
SETUP ADJUSTMENT LOCATIONS
SECTION 4
mcu B
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te No
Pelol
Peo?
£103
Icl104
4-10 VOLTAGE DATA
NOTE: All voltages are nominal and are measured with a VTVM,
13.0 VDC supply voltage at the output of the power supply
regulator.
VOLTAGE DATA
Receiver Transistors:
Emitter Base Collector
Q101 eo 2:0 8.6
Q102 4.3 acl 8.4
Q103 6) QO. 2 S.5
Q104 @) -0.15 522
Q105 (FET) 1.9 (Source) O (Gate) 8.5) (Drain)
Q1O6(FET) .42(Source) 0 (Gate) SO. Drain)
Q107(PNP)5 hoe 4.2
Q108 Ce 4.2 TEARS!
Q109 2.5 Abe phos ed
Q110 13 Lo 5.1
O11 8.7 8.6 0 (Unsquelched)
Shea 8.6 8.4 (Tight Squelched)
0112 @) O 2.3(Unsquelched)
O 0.7 O(Tight Squelched)
Q113 > Pgh 6.1(Unsquelched)
130 0 8.4(Tight Squelched)
OLlld OA 0.8 L207 eee a Os
Gal} ) 0.4 1330 @ 25°06
Receiver Integrated Circuits:
: ih 2 3 4 5 Be xk 8 2) 10 gk 2 dey Ales!
ESO gk he. 9) OMA @) 4.9 DAGA Sih RES = = me a =
2 We ome 20, ga DAU re mite Bete 4 Be rs = = = os
ARSC tee) 5 1S) eA ths oe Ld GprcOm rae 1 Oy os. One
32.0 - =) 12.6% 0.5)" O25. 626 @) 8) 0 - 6.6 - ~
mcu B -9- SECTION 4
Transmitter Transistors:
Emitter Base Collector
Q201 320 2:0 Sue
0202 6) O55 6.0
0203 0) 0.34 10.0
Q204 O G..05 gL AG)
Q205 O -0.62 13.0
Q206 (PNP) 720 7.4 Pie0
Q207 0.4 Oe 135 OMe. 25°C
Q208 @) 0:4 13.0) @ 25°C
Transmitter Integrated Circuits:
TCINO "2 al) Re 74) Sern
IC201 4.0 4.0. 4,0 6) 4.0 4.20 £420 3652
Te2Z02 0) O 13-8 6) 6.6 O -O.1 ~
Power Supply Transistors
Emitter Base Collector
Q401 L3..8 15.6 23
0402 6 6.5 15.6
Q501 13 Shy is! 23
mcu B -10- SECTION 4
N.0.
Tl oe
sw 502A
©
SW 502B
Oo
Sw 503B
5 SW. 504A
sw 504B
SW 505A
sw 505 8B
ci74 | SPKR
Eos 50I
J502
| <
03 EXTERNAL
2 | SPEAKER
O CONNECTOR
P50!
110-130 VAC
60 HERTZ
NOTES
2
3
4.
5
6.
ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE ARE OHMS
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE “4 W
AANOTED VALUES ARE FACTORY SELECTED, NOMINAL VALUE SHOWN
[___] DENOTES ADJUSTABLE COMPONENTS
(Oo; DENOTES CIRCUIT JUNCTION POINTS FOR TONE OPTION
HEAVY LINE DENOTES APPARENT SIGNAL FLOW
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH A
VTVM, SUPPLY VOLTAGE =13.8 VDC AT OUTPUT OF REGULATED
VOLTAGE SUPPLY.
a. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING
CONDITIONS:
U= UNSQUELCHED
S= SQUELCHED - THRESHOLD
T= SQUELCHED- TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED
WITH TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD
JUMPER BETWEEN {L} AND {J} REMOVED WHEN TONE OPTION 1S
UTILIZED
PART DESIGNATION NUMBERS INDICATE LOCATION
100 SERIES-RECEIVER BOARD
200 SERIES- TRANSMITTER BOARD
400 SERIES-POWER SUPPLY REGULATOR BOARD
500 SERIES- CHASSIS MOUNTED
4-|| SCHEMATIC
SECTION 4
Transmitter
Q201
Q202
Q203
Q204
Q205
Q206 (PNP)
Q207
Q208
Transistors:
Emitter
Transmitter Integrated Circuits:
LCWNOL as
La2ot 4.
TE202 0)
Power Supply
Q401
Q402
O50x
mcu B
20S
0 4.0 4.0
O75 Ses
Transistors
Emitter
SCS
6
3
|S
Base Collector
270 Se
Ora 6.0
0.34 TOSO
0.05 oe
-0.62 13.0
ya PES)
0.8 I3.0%@ 25°C
O74 13.0 '@ 25°C
5 Came
4°00 250) S420ne oe
6.6 O -0.1 -
Base Collector
L526 23
O25 a 15.6
W3e 23
-lO- SECTION 4
L018)
RIOIB cio1s yiO1B crioz8
¢ 4€ [ i+
10K 33PF
cRIOIB moze J. Lioze
my2209 4.7K 5.6UHY
co cioz8
IMF
Sw S0zA
Incl
LioIc
RIOIC core AAR YIOIc cRio2c
| : sw 5028
9 10K 33°F
NC
cRIOIC
Mv2203
cio2zc
|No] omF T_
Sw 5034 =
NC
if xa | RIOD coi YIOID
sws038 4 ‘Oo
So 10K 33PF
= cRIOD RIO2D
my2203
= 4.7K
al
’ Nod ce
= Sw50S8
Lag
N.O2
| sw5048
ae Er] L201]
a nia R203A 7 Y20i1A —C201A cR202A
ies i = = == aa
| cR2o1A R2054 | 202A
uv2209 1oouHY
= 10K
NO.
Sw SOSA c202a
2 O1MF ale
NC)
Ld, . =
| sw 5058
ee) y2018 c201B cRe028
my |__Reoze i rey
47K T 360PF
cRz018 i 2028
= mv2209 = 10K JOOUHY
ame
01 MF
a) yYzor —c201c cR202¢
R203
+ SOP et
47K if 360PF
ee R205¢
mv2209 L2oec
=D = 10K 1OOURY.
caozc +
01 MF
10
R2030 ABs Y2oiD C2010 creo20
v Dt ia
PS 47) 360PF one,
‘ cR201D 4 R205D L2020 JOOUHY
mv2209 i AN, a
R207;
2020 1K
«01 MF
FLION
10.7 MHZ F
FLIO2
ILTER
Liz6
u27|Li28 L129]L130
cl2q
125.
seprT
SE
ClO}
MCI5SOP
10,7 MHZ AMP
RI
2.2K
1c102
MCI550P.
AMP -MIXER
ape cael
TPIO3
Ri23
10K
CRIO3:
IN4I48
= cigot
62PF
FLIO4
455 KHZ FILTER ci4i
=200PF
foouny L&
ci39
Li24
100 UHY
104
Qio4 Ic
2N5130 TBA8IOS
TRIPLER AUDIO POWER
RUB AMP
330
RIS7
= MCI357P nt
LIMITER — 100
RI2BS RI29) C150, DISCRIMINATOR R506 cia
ame 1K 001 =e 100
avr Sy tT 4 CBOE Tort
“pe 5951539) 047 (oo
FINA ca 2 a Ri R149 RIS! =
Nv WH, TOP] Sy\a2 137 18K 3.3K VOLUME
| -o09) “47K 8.47 K
| Pso52 GS errescnt cie2 | piss
CRIOIA be RIdO CiSé ciel
R130 cisitt cise. 4¢ JoI3 a Po
V2209 10K 10 001 47k 002 | 047 /13.6U RIS SPKR
N50,
| 04 5.6K CE ok ial
= RIB8S RIGIS RIGG: (ra RIS2 = +
AUTOMATIC FREQUENCY CONTROL 39K2 5.6K2 10K. 8. oe a = 560 =
Out
! Seats Ay al 2h
a =
ies aes ( RAP )oni2 QuU3
SK 002 | QUO. 10K oe SPS952 sps952
ri SQUELCHED
RI39 AMP-AUDIO
10K. RIG2
2.2K
J502
°
NOISE SQUELCH = < }
MICROPHONE R503 LS | oxernac
HANG UP BUTTON + T 2 | SPEAKER
CONNECTOR
= Pe SPEECH AMP < |
= jy eee
PTT Sw Ic201A
> ~o VeLM358N
Ic2018
"2LM358N_~
= o) ME
DEVIATION
y S503
ANTENNA
CONNECTOR
R225 i
r q g
caer, rai, Bees bats 2.2K TP205 cael eae R502 0802
IN 4002 __ IN4002 g,y R206 8.2V R217 = fe Te TOPE TT
i<— 4 _ Ti T L2i7. = = 10.0 TRANSMIT P5091 $501
cR203 R205 R208 33. TP204 eW \NDICATOR = |
INa002 OE as 1Na738A ine R226 TSO! F5Ol | wi J]
W501 a a
1N5849B con | oo R223 232 SJEGSS ONZOFF Q50/ Siioo inaooe | AMP [= U| u
01 10K .68PF .68PF ITCH $u5149 | |
ae a203 A copes Sr) Leal pe ied Nan |] | = =
R2i2 = 696-5 228 C229 C230 Few me rea 238 Wt - Tan 1
x L206. TRIPLER cai 6.8PF| .22PF] 6.8PF Ss 0205 ca39 SPF cf2 c2al C243 E no [2 | u
pol oe UHY es Ceeet 2PF ae *0 aj C501 1 ME -
Wie Laid } Le 20. DOUBLER bess (eb a eet = = = 050) 005 ny
(eal 276PF ‘276PF | 276PF Pa ON/OFF (f=) CSO. 1,400V
INDICATOR | .05 _— =
R215. 2.5/ i = = ci
———— R213. 4705 C2i2r Cala. 20PF | |
209] 10K = i g 9 a 5 2 i 10-130 VAC
Q201 c208 47PF = POWER AMP MODULE = 60 HERTZ
SPSI476 1 a202 IC501
OSC,
C210}
SPSI473
isopé] 82S BUFFER-
AMP
RECEIVE CRYSTAL WARMER CIRCUIT
RIG! f
CRIO5:
1N5849B 470
RIGO:
aula
AOS
220
vew
RIS8A
68
cRai2
RISBBS RIGZAS, RI62
68 68 68
2W 2W 2W 1N58498
i)
SS —— =
XTAI, WARMER XTAL WARMER
RESISTOR PAIR RESISTOR PAIR
jalis,
SJE649
Reasal R2438.
68 68
2W ew 2W
XTALWARMER .XTALY WARMER
RESISTOR PAIR RESISTOR PAIR
RT 202 (3.1
0208
SJE649
POWER SUPPLY REGULATOR BOARD
mcu B
NOTES
ALL RESISTOR VALUES NOT SPECIFIED OTHERWISE ARE OHMS
ALL RESISTORS NOT SPECIFIED OTHERWISE ARE “%4 W
VALUES ARE FACTORY SELECTED, NOMINAL VALUE SHOWN
Ano
ADJUSTABLE COMPONENTS
(DENOTES CIRC!
IT JUNCTION POINTS FOR TONE OPTION
HEAVY LINE DENOTES APPARENT SIGNAL FLOW
ALL VOLTAGES ARE NOMINAL VALUES AS MEASURED WITH A
SUPPLY VOLTAGE = 13.8 VOC AT OUTPUT OF REGULATED
GE SUPPLY
LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING
CONDITIONS
U> UNSQUELCHED
S= SQUELCHED - THRESHOLD
T= SQUELCHED- TIGHT
VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED
WITH TRANSMITTER IN OPERATION ANO CONNECTED TO A PROPER LOAD
JUMPER BETWEEN {L} AND {J} REMOVED WHEN TONE OPTION IS
UTILIZED
PART DESIGNATION NUMBERS INDICATE LOCATION
100 SERIES-RECEIVER BOARO
200 SERIES- TRANSMITTER BOARD
400 SERIES-POWER SUPPLY REGULATOR BOARD
500 SERIES- CHASSIS MOUNTED
4-11 SCHEMATIC
SECTION 4
, hy Pu
Ra
SECTION 5
PARTS LIST
NOTE: WHEN ORDERING PARTS, PLEASE INCLUDE THE FOLLOWING
INFORMATION :
a. MODEL NUMBER (mcuB)
b. ITEM NUMBER
c. DESCRIPTION
d. PART NUMBER
®)
mcuB SECTION 5
Se a a aaa aera nena
c401
cR401
Q401
Q402
REGULATOR BOARD 302-032
DESCRIPTION
RESISTORS
1K, 10%, 4w
1.5K, 10%, 4w
10K, 10%, xw
4700hm, 5%, 4wW
1000hm, Trimmer
4700hm, 5%, 4wW
CAPACITORS
.05 mfd, +80-20%, 25v (DISC)
DIODES
zener, 6v, +5%, 500MW
TRANSISTORS
PNP
PNP
mcu B
PART NO.
4701-0102-042
4701-0152-042
4701-0103-042
4701-0471-032
4751-0101-005
4701-0471-032
1502-0503-004
4801-0000-140
4801-0000-005
4801-0000-010
ITEM
DESCRIPTION
at
PART NO.
SECTION 5
5-2 RECEIVER BOARD
ITEM DESCRIPTION PART NO
RESISTORS
R1O1A 10K, 10%, 4w 4701-0103-042
R101B* 10K, 10%, Ww 4701-0103-042
R101Cc* 10K, 10%, yw 4701-0103-042
R101D* 10K,10%, yw 4701-0103-042
R102A 4.7K, 10%, Ww 4701-0472-042
R102B* 4.7K,10%, kw 4701-0472-042
R102c* 4.7K,10%, Ww 4701-0472-042
R102D* 4.7K,10%,}W 4701-0472-042
R103
R104* 1K, 10%, kw 4701-0102-042
R105 22K, 10%, xw 4701-0223-042
R106 10K, 10%, kw 4701-0103-042
R107 220ohm, 10%, kw 4701-0221-042
R108
R109 1K, 10%, kw 4701-0102-042
R110 1.5K, 10%, kw 4701-0152-042
R111 220o0hm, 10%, Ww 4701-0221-042
R112 10K, 10%, iw 4701-0103-042
R113 22K, 10%, yw 4701-0223-042
R114 470ohm, 10%, 4w 4701-0471-042
R115
R116 10K, 10%, kw 4701-0103-042
R117 470o0hm, 10%, 4w 4701-0471-042
R118 330ohm, 10%, kw 4701-0331-042
R119 2.2K, 10%, kw 4701-0222-042
R120
R121 2.2K, 10%, kw 4701-0222-042
R122 10K, 10%, }w 4701-0103-042
R123 10K, 10%, kw 4701-0103-042
R124
R125 47K, 10%, kw 4701-0473-042
R126
R127
R128 27K, 10%, 4w 4701-0273-042
R129 1K, 10%, 4w 4701-0102-042
R130 10K, 10%, kw 4701-0103-042
R131 56K, 10%, 4w 4701-0563-042
R132 10K, Trimmer 4751-0103-001
R133 47K, 10%, 4w 4701-0473-042
R134 1K, 10%, kw 4701-0102-042
R135 1.8K, 10%, kw 4761-0182-042
R136 1K, 10%, 4w 4701-0102-042
R137 47K, 10%, 4w 4701-0473-042
R138 39K, 10%, 4w 4701-0393-042
R139 10K, 10%, 4w 4701-0103-042
R140 4.7K, 10%, kw 4701-0472-042
R141 5.6K, 10%, kw 4701-0562-042
R142 2.2K, 10%, iw 4701-0222-042
R143 1000hm, 10%, 44w 4701-0101-042
R144 10K, 10%, }w 4701-0103-042
R145 10K, 10%, sw 4701-0103-042
R146 2.2K, 10%, kw 4701-0222-042
R147 10K, 10%, 4w 4701-0103-042
R148
R149 18K, 10%, 74w 4701-0183-042
R150 5.6K, 10%, 4W 4701-0562-042
R151 3.3K, 10%, 4w 4701-0332-042
R152 560ohm, 10%, kw 4701-0561-042
R153 47K, 10%, kw 4701-0473-042
R154 390hm, 10%, 1w 4701-0390-045
R155 10K, 10%, kw 4701-0103-042
R156 56ohm, 10%, 4w 4701-0561-042
R157 1000hm, 10%, 4w 4701-0101-042
R158A 680hm, 10%, 2W(wire wound) 4710-0680-041
R158B 68o0hm, 10%, 2W(wire wound) 4710-0680-041
R159 5.6K 10%, yw 4701-0562-042
R160 4700hm, 10%, 4w 4701-0471-042
R161 220o0hm, 10%, sw 4701-0221-044
R162A* 68o0hm,10%, 2w(wire wound) 4710-0680-041
R162B* 680hm,10%, 2W(wire wound) 4710-0680-041
R163 47ohm, 10%, iw 4701-0470-042
mcu B
ee ee eee
ITEM DESCRIPTION PART NO
CAPACITORS
C101A 33PF,10%,NPO, 50V (DISC) 1500-0330-650
C101B* 33PF,10%,NPO,50V (DISC) 1500-0330-650
C1l01C* 33PF,10%,NPO, 50V (DISC) 1500-0330-650
C101D* 33PF,10%,NPO, 50V(DISC) 1500-0330-640
C1l02A* .01 mfd,+80-20%, 12V (DISC) 1502-0103-006
C102B* .01 mfd,+80-20%, 12V (DISC) 1502-0103-006
C102c* .01 mfd,+80-20%, 12vV (DISC) 1502-0103-006
C102D* .01 mfd,+80-20%, 12V (DISC) 1502-0103-006
C103 360 PF 5%, 50V (MICA) 1506-0361-550
c105 39 PF,10%,NPO, 50V (DISC) 1500-0390-650
C106 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C107 15PF, 10%, NPO, 50V (DISC) 1500-0150-650
C108 .O001 mfd, 20%, 50V (DISC) 1523-0102-002
C109 68PF,5%,NPO, 50V (DISC) 1524-0680-002
c1l10 -001 mfd, 20%, 50V (DISC) 1523-0102-002
onli 47PF,5%,NPO, 50V (DISC) 1524-0470-002
eli2 20PF, 10%,NPO, 50V (DISC) 1500-0200-650
C113 20PF,10%,NPO, 50V (DISC) 1500-0200-650
c114 -O1 mfd, +80-20%, 12V (DISC) 1502-0103-006
(ens -0O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
c1l6 47PF,5%,NPO, 50V (DISC) 1524-0470-002
en ub g/ 82PF,5%,NPO, 50V (DISC) 1524-0820-002
c1l1s 47PF,5%,NPO, 50V (DISC) 1524-0470-002
CELSO -001 mfd, 20%, 50V (DISC) 1523-0102-002
E120 47PF,5%,NPO, 50V (DISC) 1524-0470-002
(on keae 470PF, 20%, 50V (DISC) 1523-0471-002
C122 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C124 5.6PF,10%,NPO, 500V (DISC) 1500-0569-905
E25 5.6PF,10%,NPO, 500V (DISC) 1500-0569-905
C126 47PF,5%,NPO, 50V (DISC) 1524-0470-002
C127 .O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C128 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C129 -O1 mfd, +80-20%, 12V (DISC) 1502-0103-006
C130 220PF,5%, 50V (MICA) 1506-0221-550
eism -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
Gu32 3.9PF,10%,NPO, 500V (DISC) 1500-0399-905
C133 300PF, 5%, 50V (MICA) 1506-0301-550
C134 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C135 Ol mfd,+80-20%, 12V (DISC) 1502-0103-006
C136 68PF,5%,NPO, 50V (DISC) 1524-0680-002
C137 -2 mfd,+80-20%, 12V (DISC) 1502-0204-006
CLS9 68PF, 5%, 50V (MICA) 1506-0680-550
c14o 82PF,5%,NPO, 50V (DISC) 1524-0820-002
cl141 200PF, 5%, 50V (MICA) 1506-0201-550
C142 680PF, 5%, 50V (MICA) 1506-0681-550
C143 -2 mfd,+80-20%, 12V (DISC) 1502-0204-006
C144 -2 mfd,+80-20%, 12V (DISC) 1502-0204-006
c145 -2 mfd,+80-20%, 12V (DISC) 1502-0204-006
C146 -002 mfd, 20%, 50V (DISC) 1523-0202-002
C147 39PF,10%,NPO, 50V (DISC) 1500-0390-650
c148 -2 mfd,+80-20%, 12V (DISC) 1502-0204-006
C149 68PF,5%,NPO, 50V (DISC) 1524-0680-002
C150 -001 mfd, 20%, 50V (DISC) 1523-0102-002
Crs 1 mfd,50V,85°C (Electrolytic) 1513-0010-004
CU52 -001 mfd, 20%, 50V (DISC) 1523-0102-002
C153 -002 mfd, 20%, 50V (DISC) 1523-0202-002
C154 -002 mfd, 20%, 50V (DISC) 1523-0202-002
C155 -002 mfd, 20%, 50V (DISC) 1523-0202-002
C156 -002 mfd, 20%, 50V (DISC) 1523-0202-002
CLS7. -1 mfd, 20%, 12V (DISC) 1502-0104-005
C158 -047 mfd, 10%, 100V(Mylar Film) 1508-0473-610
C159 25 mfd,10V,85°C (Electrolytic) 1513-0250-001
C161 -047 mfd,10%,100V(Mylar Film) 1508-0473-610
C162 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
C163 250 mfd,16V,85°C (Electrolytic) 1513-0251-002
c165 -O1 mfd, +80-20%, 12V (DISC) 1502-0103-006
C167 100 mfd,16v,85°c (Electrolytic) 1513-0101-001
C168 100 mfd,16V,85°c (Electrolytic) 1513-0101-001
C169 100 mfd,16v, 85°C (Electrolytic) 1513-0101-001
C170 -O1 mfd,+80-20%, 12V (DISC) 1502-0103-006
Cu7 a 470PF, 20%, 50V (DISC) 1523-0471-002
Mg 100 mfd,16v,85°c (Electrolytic) 1513-0101-001
e173 -Ol mfd, +80-20%, 12V (DISC) 1502-0103-006
C174 250 mfd,16V,85°c (Electrolytic) 1513-0251-002
CL7S -0047 mfd, 10%, 100V (Mylar Film) 1508-0472-610
C176 -O1 mfd,+80-20%, 12V (DISC)
1502-0103-006
SECTION 5
°
5-2 RECEIVER BOARD
ITEM DESCRIPTION PART NO.
COILS
L101A Frequency Adjust 1800-3191-406
L101B* Frequency Adjust 1800-3191-406
L101Cc* Frequency Adjust 1800-3191-406
L101D* Frequency Adjust 1800-3191-406
L102A* Choke,RF,5.6 uhy 1802-0569-008
L102B* Choke,RF,5.6 uhy 1802-0569-008
L102c* Choke,RF,5.6 uhy 1802-0569-008
L102D* Choke,RF,5.6 uhy 1802-0569-008
L103* Choke,RF,5.6 uhy 1802-0569-008
L104 Oscillator Adjust 1800-5100-521
L105 Choke, RF,.27 uhy 1802-0278-008
L106 Choke, RF,15 uhy 1802-0150-004
L107 Buffer Adjust 1800-5100-511
L108 Choke, RF 1800-5100-523
L11il Choke, RF 1800-5100-522
L116 Choke, RF 1800=5100-523
L117 Choke, RF,.1 uhy 1802-0108-008
L118 Choke, RF,22 uhy 1802-0220-008
L119 Crystal Filter Tune 1800-3248-001
L120 Crystal Filter Tune 1800-3248-001
E27 Choke, RF,820 uhy 1802-0000-002
L122 Choke, RF,820 uhy 1803-3182-700
L123 Discriminator Adjust 1800-3218-800
L124 Choke, RF,100 uhy 1802-0101-008
L125 Choke, RF,15 uhy 1802-0150-004
L126 Bead, Choke 2502-0000-001
L127 Bead, Choke 2502-0000-001
L128 Bead, Choke 2502-0000-001
L129 Bead, Choke 2502-0000-001
L130 Bead, Choke 2502-0000-001
L131 Bead, Choke 2502-0000-001
L132 Choke, RF,100 uhy 1802-0101-008
TLOU Coil 1800-3168-300
DIODES
CR1O1A Varicap,MVv2209 4809-0000-001L
CR1O1B* Varicap,MV2209 4809-0000-001
CR101C* Varicap,MVv2209 4809-0000-001
CR1O1D* Varicap,MV2209 4809-0000-001
CR102A* Germ, 102-339 4807-1233-900
CR102B* Germ, 102-339 4807-1233-900
CR102C* Germ, 102-339 4807-1233-900
CR102D* Germ, 102-339 4807-1233-900
CRLO3 Sil, 102-412, 1N4148 4805-1241-200
CR104 Zener, 8.2V, 1N4738A 4808-0000-009
CR105 Zener, 6v,5%,MZ92-6.0B 4808-0000-012
TRANSISTORS
Q101 NPN 4801-0000-095
Q102 NPN 4801-0000-095
Q103 NPN 4801-0000-095
Q104 NPN 4801-0000-095
Q105 FET 4811-0000-005
Q106 FET 4811-0000-030
Q107 PNP (Wht Top) 4801-0000-060
Q108 NPN 4801-0000-010
Q109 NPN 4801-0000-010
Q110 NPN 4801-0000-010
ony PNP (Wht Top) 4801-0000-060
Q1l12 NPN 4801-0000-010
Q113 NPN 4801-0000-010
Q114 NPN 4801-0000-005
Q115 NPN 4802-0000-002
THERMISTORS
RT101 Thermistor 5300-0000-001
mcu B
DESCRIPTION
PART NO.
a ee ee ee re
FL101
FL102
FL103
FL104
y102
*Parts applicable to U14B only
INTEGRATED CIRCUITS
10.7 MHz Amp
Amp-Mixer
Limiter-Discriminator
Audio Amp
FILTERS
Filter,Xtal 2P 10.7 MHz
Filter,Xtal 2P 10.7 MHz
Filter,Xtal 2P 10.7 MHz
Filter,Ceramic CFU455D
CRYSTALS
10.245 MHz (Standard)
3130-3167-901
3130-3167-901
3130-3157-603
3130-3248-801
2705-3232-200
2705-1306-600
2705-3232-200
2700-3209-500
2301-3151-601
SECTION 5
5-3 TRANSMITTER BOARD
PART NO.
ITEM DESCRIPTION
RESISTORS
R201 47K, 10%, 4w
R202 22K, 10%, 4w
R203A 47K, 10%, yw
R203B* 47K, 10%, Ww
R203C* 47K, 10%, Ww
R203D* 47K, 10%, Ww
R204 4.7K, 10%, 4w
R205A 10K, 10%, 4w
R205B* 10K,10%, kw
R205C* 10K, 10%, }w
R205D* 10K, 10%, \w
R206 100ohm, 10%, 4w
R207* 1K, 10%, 4w
R208 22K, 10%, 4w
R209 6.8K, 10%, yw
R210 10K, 10%, 4w
R211 2200hm, 10%, 4w
R212 10K, 10%, 4w
R213 10K, 10%, yw
R214 680ohm, 10%, 4w
R215 470o0hm, 10%, kw
R216 10K, 10%, 4w
R217 330hm, 10%, sw
R218 10K, 10%, *4w
R219 470ohm, 10%, 4w
R220 10K, 10%, yw
R221 330ohm, 10%, 4w
R222 470ohm, 10%, }w
R223 10K, 10%, 4w
R224 2200hm, 10%, 4w
R225 2.2K, 10%, yw
R226 10K, 10%, 4w
R227 1K, Trimmer
R228 100o0hm, 10%, sw
R229 10K, 10%, 4w
R230 4.7K, 10%, w
R231 100K, 10%, kw
R232 4.7K, 10%, kw
R233 100K, 10%, kw
R234 1.5meg, 10%, iw
R235 4.7K, 10%, Ww
R236 120K, 10%, 4w
R237 12K, 10%, 4w
R238 470K, 10%, 4w
R239 12K, 10%, yw
R240 10K, Trimmer
R241 4700hm, 10%, kw
R242A 68o0hm, 10%, 2W(wire wound)
R242B 68o0hm, 10%, 2W(wire wound)
R243A* 680hm, 10%, 2W(wire wound)
R243B* 68o0hm, 10%, 2W(wire wound)
R244 47ohm, 10%, sw
R245 47ohm, 10%, 4w
CAPACITORS
C201A* 360PF,5%,50V (MICA)
C201B* 360PF,5%, 50V (MICA)
C201c* 360PF,5%, 50V (MICA)
C201D* 360PF,5%,50V (MICA)
C202A* .01 mfd,+80-20%, 12V (DISC)
C202B* .01 mfd,+80-20%,12V (DISC)
C202c* .01 mfd,+80-20%,12V (DISC)
C202D* .01 mfd,+80-20%, 12V(DISC)
C203 360PF, 5%, 50V (MICA)
C204 20PF, 10%,NPO, 50V (DISC)
C205 .001 mfd, 20%, 50V (DISC)
C206 360PF, 5%, 50V (MICA)
C207
C208 5PF, 10%, NPO, 500V (DISC)
C209
C210 1L50PF, 5%, 50V (MICA)
op ulal -O1 mfd,+80-20% 12V (DISC)
C212 47PF,5%,NPO, 50V (DISC)
mcu B
4701-0473-042
4701-0223-042
4701-0473-042
4701-0473-042
4701-0473-042
4701-0473-042
4701-0472-042
4701-0103-042
4701-0103-042
4701-0103-042
4701-0103-042
4701-0101-042
4701-0102-042
4701-0223-042
4701-0682-042
4701-0103-042
4701-0221-042
4701-0103-042
4701-0103-042
4701-0681-042
4701-0471-042
4701-0103-042
4701-0330-044
4701-0103-042
4701-0471-042
4701-0103--042
4701-0331-042
4701-0471-042
4701-0103-042
4701-0221-042
4701-0222-042
4701-0103-042
4751-0102-005
4701-0101-042
4701-0103-042
4701-0472-042
4701-0104-042
4701-0472-042
4701-0104-042
4701-0155-042
4701-0472-042
4701-0124-042
4701-0123-042
4701-0474-042
4701-0123-042
4751-0103-001
4701-0471-042
4710-0680-041
4710-0680-041
4710-0680-041
4710-0680-041
4701-0470-044
4701-0470-042
1506-0361-550
1506-0361-550
1506-0361-550
1506-0361-550
1502-0103-006
1502-0103-006
1502-0103-006
1502-0103-006
1506-0361-550
1500-0200-650
1523-0102-002
1506-0361-550
1500-0050-905
1506-0151-550
1502-0103-006
1524-0470-002
ITEM
DESCRIPTION
PART NO.
C214
C215
C216
C217
C218
E€2%9
C220
C221
C222.
C223
C224
(225
C226
C227
C228
C229
C230
e230
C232
C283
C234
C235
C236
C237
C238
C239
C240
c241
C242
C243
C244
C245
C246
C247
C248
C249
C250
c251
C252
e255
C254
C255
C256
C257,
C258
C259,
C260
C261
C262
C263
C264
C265
C266
C267
C268
C269
C270
120PF,5%, 50V (MICA)
2.2PF,+.25PF,NPO(DISC)
47PF,5%,NPO, 50V (DISC)
150PF, 5%, 50V (MICA)
-O1 mfd,+80-20%, 25V (DISC)
-001 mfd, 20%, 50V (DISC)
8.2PF,10%,NPO, 500V (DISC)
2 = 2PE ye 25PF,NPO (DISC)
8.2PF,10%,NPO, 500V (DISC)
1PF, 10% (Composition)
12PF,10%,NPO, 500V (DISC)
A47PF,5%,NPO, 50V (DISC)
-O1 mfd, +80-20%, 25V (DISC)
15PF,10%,NPO, 50V (DISC)
6.8PF,10%,NPO, 500V (DISC)
0. 22PF,10% (Composition)
2.5-20PF, Trimmer
82PF,5%,NPO, 50V (DISC)
2-6PF,Trimmer
0.68PF, 10% (Composition)
2-6PF,Trimmer
0.68PF,10%(Composition)
2-6PF, Trimmer
5PF,10%,NPO, 500V (DISC)
2PF,NPO (DISC)
470PF, 20%, 50V (DISC)
10 mfd,25V,85°0C (Electrolytic)
10 mfd,25V,85°C (Electrolytic)
470PF, 20%, 50V (DISC)
470PF, 20%, 50V (DISC)
10 mfd,25V,85°9C (Electrolytic)
.O1 mfd,+80-20%, 25V (DISC)
2. 2PF,+.25PF,NPO (DISC)
15PF,10%,NPO, 50V (DISC)
15PF,10%,NPO, 50V (DISC)
15PF, 10%, NPO, 50V (DISC)
1000 mfd,16V,85°9C (Electrolytic)
-O1 mfd,+80-20%, 25V (DISC)
10 mfd,25V,85°C (Electrolytic)
100 mfd,16V,85°C (Electrolytic)
-O1 mfd,+80-20%, 12V (DISC)
10 mfd,25V,85°9C (Electrolytic)
-001 mfd, 20%, 50V (DISC)
1OPF,10%,NPO, 500V (DISC)
-O1 mfd, +80-20%, 12V (DISC)
1 mfd,50V,85°C (Electrolytic)
-0033 mfd,10%, 100V(Mylar Film)
-003 mfd,10%, 100V(Mylar Film)
150PF, 20%, 50V (DISC)
-O1 mfd,+80-20%, 12V (DISC)
.1 mfd, 20%, 12V (DISC)
.1 mfd, 20%, 12V (DISC)
22PF,10%,NPO, 500V (DISC)
-01 mfd,+80-20%, 25V (DISC)
3.9PF,+.25PF,NPO, 500V(DISC)
1506-0121-550
1500-0229-205
1524-0470-002
1506-0151-550
1502-0103-004
1523-0102-002
1500-0829-905
1500-0229-205
1500-0829-905
1510-0010-900
1500-0150-605
1524-0470-002
1502-0103-004
1500-0150-650
1500-0689-905
1510-0228-900
1517-0000-019
1501-0820-008
1517-0000-018
1510-0688-900
1517-0000-018
1510-0688-900
1517-0000-018
1500-0050-905
1501-0020-001
1523-0471-002
1513-0100-003
1513-0100-003
1523-0471-002
1523-0471-002
1513-0100-003
1502-0103-004
1500-0229-205
1500-0150-650
1500-0150-650
1500-0150-650
1513-0102-002
1502-0103-004
1513-0100-003
1513-0101-002
1502-0103-006
1513-0100-003
1523-0102-002
1500-0100-605
1502-0103-006
1513-0010-004
1508-0332-610
1508-0333-610
1523-0151-002
1502-0103-006
1502-0104-005
1502-0104-005
1500-0220-605
1502-0103-004
1500-0399-205
SECTION 5
«
5-3 TRANSMITTER BOARD
ITEM DESCRIPTION PART NO.
COILS
L201A Frequency Adjust 1800-3247-201
L201B* Frequency Adjust 1800-3247-201
L201Cc* Frequency Adjust 1800-3247-201
L201D* Frequency Adjust 1800-3247-201
L202A* Choke,RF,100 uhy 1802-0101-008
L202B* Choke,RF,100 uhy 1802-0101-008
L202C* Choke,RF,100 uhy 1802-0101-008
L202D* Choke,RF,100 uhy 1802-0101-008
L203* Choke, RF,100 uhy 1802-0101-008
L204 Oscillator, output 1800-3191-404
L205 Buffer, input 1800-3191-405
L206 Choke, RF,5.6 uhy 1802-0569-008
L207 Buffer, input 1800-3191-405
L208 Buffer, input 1800-3191-405
L209 Choke, RF,.68 uhy 1802-0688-003
L210 Tripler, output 1800-5100-524
L211 Tripler, output 1800-5100-520
L212 Doubler, input 1800-5100-520
L213 Choke, RF,.47 uhy 1802-0478-008
L214 Doubler, output 1800-5100-511
L215 Doubler, output 1800-5100-511
L216
L217 RF, inductor 1802-5125-904
L218 RF, inductor 1801-3247-401
L219 RF, inductor 1801-3247-401
L220 RF, inductor 1801-3247-401
L221 RF,Bead Assy. 2502-3254-101
L222 RF,Bead Assy. 2502-3254-101
L223 RF, Bead Assy. 2502-3254-101
L224 RF, inductor 1801-3247-401
L225 RF, inductor 1801-3247-401
L226 RF, Bead Assy. 2502-3254-101
L227 RF, Bead Assy. 2502-3254-101
DIODES
CR201A Varicap,Mv2209 4809-0000-001
CR201B* Varicap,MV2209
CR201C* Varicap,MV2209
CR201D* Varicap,MVv2209
CR202A* Germ, 102-339
CR202B* Germ, 102-339
CR202C* Germ, 102-339
CR202D* Germ, 102-339
4809-0000-001
4809-0000-001
4809-0000-001
4807-1233-900
4807-1233-900
4807-1233-900
4807-1233-900
CR203 Sil Rect, 1N4002 4806-0000-004
CR204 Sil Rect, 1N4002 4806-0000-004
CR205 Sil Rect, 1N4002 4806-0000-004
CR206 Sil Rect, 1N4002 4806-0000-004
CR207 Zener, 6V,5%,MZ92-6.0B 4808-0000-012
CR208 Zener, 8.2V,1N4738A 4808-0000-009
CR209 Sil, 1N4148,102-412 4805-1241-200
CR210 Sil, 1N4148, 102-412 4805-1241-200
CR211 Sil, 1N4148,102-412 4805-1241-200
CR212 zener, 6V,5%,MZ92-6.0B 4804-0000-012
TRANSISTORS
Q201 Silicon,NPN(Blu Top) 4801-0000-003
Q202 Silicon,NPN(Red Top) 4801-0000-035
Q203 NPN, RF power 4804-3169-605
Q204
Q205 NPN,RF power 4804-3169-607
Q206 NPN 4802-0000-002
Q207 NPN 4801-0000-005
Q208 NPN 4802-0000-002
THERMISTORS
RT201 Thermistor 5300-0000-004
RT202 Thermistor 5300-0000-001
mcu B
LN
ITEM DESCRIPTION PART NO.
INTEGRATED CIRCUITS
Ic201 Speech Amp 3130-3167-909
ELECTRICAL COMPONENTS
K201 Relay 4500-0000-004
*Parts applicable to U14B only
SECTION 5
5-4 CHASSIS ASSY
ITEM DESCRIPTION PART NO.
ELECTRICAL COMPONENTS
R501 Imeg, 10%, sw 4701-0105-044
R502 10ohm, 10%, sw 4701-0100-044
R503 680o0hm, 10%, *sw 4701-0681-044
R504 7.5K,Squelch Control 4752-0752-001
R505 5K,Volume Control 4752-0502-001
R506 180o0hm, 10%, 4w 4701-0181-042
CSOL -005 mfd,1.4KV(DISC) 1501-0502-002
c502 500 mfd, 25V,85°9C(Electrolytic) 1511-0501-003
c503 4200 mfd(Electrolytic) 1516-0422-001
c504 .05 mfd, 25V(DISC) 1502-0503-004
c505 470PF, 20%, 50V (DISC) 1501-0471-007
C506 -047 mfd, 10%, 100V (Mylar Film) 1508-0473-610
C507 100 mfd, 25V,85°C (Electrolytic) 1511-0101-003
CR501 Diode, Silicon, Rectifier 4806-0000-004
CR502 Diode, Silicon, Rectifier 4806-0000-004
CR503 Diode, Silicon, Rectifier 4806-0000-005
CR504 Diode, Silicon, Rectifier 4806-0000-005
SPK501 Speaker Assy 1301-0000-003
Sw501 Power Switch 5112-5087-406
Sw502* F1,Frequency Select Switch 5112-6035-823
SW503* F2,Frequency Select Switch 5112-6035-823
Sw504* F3,Frequency Select Switch 5112-6035-823
Sw505* F4,Frequency Select Switch 5112-6035-823
Terminal Lug Strip 2103-3008-004
Terminal Lug Strip 2103-5000-120
Terminal Lug Strip 2103-3008-012
Crystal,Transmit (Specify Freq. 2328-0000-000
or Channel No.)
Crystal, Receive (Specify Freq. 2329-0000-000
or Channel No.)
J502 Remote Speaker Connector Housing, 2109-5120-403
Male
J503 Antenna Connector 2105-0000-020
Auxiliary Connector Housing,Male 2109-5120-408
Connector, Microphone 2105-0000-023
Microphone Assy 7011-4000-300
A.C. Power Cord Assy 7011-1037-700
Q501 Transistor,SJ5149 4803-0000-005
T501 Transformer, Power 5604-5097-100
Socket, Transistor 2108-0000-002
TESOL Module RF Amp UHF 3132-5112-501
F501 Fuse, 2 Amp 5106-0000-004
D501 Lamp, Clear 3901-0000-002
D502 Lamp, Clear 3901-0000-002
Plug, Power 2104-0000-004
MECHANICAL COMPONENTS
Heat Sink 5400-3248-300
Heat Sink Yr 5400-3401-400
Heat Sink 5400-1260-900
Heat Sink 5400-0000-001
Heat Sink 5400-1285-601
Insulating Bushing 2501-0000-001
Insulating Mica Washer 3103-0000-001
Clamp, Capacitor 2830-0000-002
A.C. Shield 2508-3401-700
Knob, Volume and Squelch 2402-2167-001
Fuseholder W/Nut and Washer 2100-0000-003
Wrap 1408-6401-400
Back Panel 1405-5401-900
Manual,Owner's Instruction 7001-4005-800
Lens, Red 3900-0000-002
Lens,Green 3900-0000-003
*Parts Applicable for U14B Only
mcu B
ITEM DESCRIPTION PART NO,
—_. se ee
0s SECTION 5
SECTION 6
TONE SQUELCH OPTION
mcuB ' SECTION 6
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SECTION 6 TONE SQUELCH (CTCSS) OPTION
6-1 GENERAL DESCRIPTION
The Model MA-90 Tone Squelch system is supplied as a factory
installed, or field installed option to MICRO-COM U11B and MICRO-
COM U14B model transceivers. This option equips the radio for op-
eration on systems using Continuous Tone Controlled Squelch Systems
herCss) .
The circuit elements of the MA-90 tone squelch system are
mounted ona plug-in circuit board module, which fits into a shield-
ed compartment and socket located inthe transmitter section of the
transceiver.
Whether supplied with, or without, the Tone Squelch option,
all MICRO-COM U11B and U14B transceivers are equipped with the
Shielded compartment and connector socket to accept the Tone Squelch
module. When the transceivers are supplied without the tone squelch
option, ajumper wire is installed onthe transmitter circuit board,
near the tone option socket. to permit operation of the receiver
without the tone module.
A block diagramof the tone systemis shown in Figure 6-4, and
a full schematic is shown in Figure 6-7:
6-2 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 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 fromthe receiver discriminator (at L) is also fed into
Ic602, which contains a low pass filter, and a limiter amplifier.
The lowpass filter removes most of the speech and higher frequen-
cy 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 CTCSS tone. IC603 contains the tone determining por-
tions of the combination, and IC604 contains the necessary ampli-
fiers 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
mcu B -[- SECTION 6
Ic605, which is a detector circuit that detects the presence (or
absence) of a tone signal.
The IC605 output is normally high, and goes £o 4 dowrvo lee
age upon receipt of 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.
6-3 TRANSMITTING-MONITORING CONDITION
Both the block diagram and the full circuit diagram show a
terminal point D, which is used to switch the system from the "re-
ceive" condition to the "transmit-monitor" condition. When point
D is grounded, the systemis in the "transmit—monitor" condition.
The grounding and ungrounding of point D is accomplished in vari-
ous ways, depending upon the particular installation. In base
station installations, point D is grounded when the monitor key
on the desk microphone is in its normal up position.
When point Dbecomes ungrounded, the ungrounded condition is
sensed by circuitry inside IC604, and the gain of the operational
amplifiers in IC604 is increased greatly so that the combination of
IC603 and Ic604 becomes an oscillator, with the frequency of out-
put being determined by IC603. The oscillation is sensed by IC605:,
the level detector, “and C605) previdese tes high and low outputs,
just as-it would-if it were récelving an incoming =rone Signal. Pin
K goes low, permitting the receiver audio system to operate. [In
this condition, the radio receiver will hear any Signals on the
channel regardless of whether or not they have the proper CTCSS
tone. This is the "monitoring" condition, which happens tobe the
same as the "transmit" condition, insofar as the tone system is
concerned.
The oscillation output of IC603, ICG604 is fed to Pans Ghus
to the modulation section of the transmitter. When the transmit-—
ter is activated, it is modulated by, the Cress tone:
The amplitude of the tone voltage sent to the transmitter is
controlled by R605, whichis the control for adjusting the amount
of modulation deviation causedby the tone. After the transmitter
has been adjusted for proper modulation deviation on speech, ac-
cording to the instructions given in the transmitter tuning pro-
cedure, R605 should be set to provide tone modulation deviation
of plus andminus 750 Hz, (or less, depending upon the radio sys-
tem).
mcu B -2- SECTION 6
ICGO3
TONE
DETERMINING
NETWORK
IC60]
IC60S
AUDIO FROM HIGH PASS LOW PASS LIMITER
DISCRIMINATOR FILTER FILTER MP Dae ores e
: D.C. SWITCH
=
TONE TO
AUDIO TO TRANSMITTER
RECEIVER
AUDIO AMP necks
——
a MIC HANG UP
en RECEIVER CONTROL
= OUTPUT
6-4 TONE MODULE BLOCK DIAGRAM
mcu B == SECTION 6
TONE BOARD
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6-5 TONE BOARD TOP VIEW
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6-6 TONE BOARD BOTTOM VIEW
di ae SECTION 6
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6-7 TONE BOARD SCHEMATIC
SECTION 6
mcu B
6-8 TONE ENCODER-DECODER BD. 302-508
ITEM DESCRIPTION PART NO.
RESISTORS
R601 130K, 10%, kw 4701-0134-032
R602 91K,10%, kw 4701-0913-032
R604 15K, 10%, 4W 4701-0153-042
R605 10K, Trimmer 4751-0103-002
R607 100K, 10%, kw 4701-0104-042
CAPACITORS
C601 -O1 mfd,+80-20%, 12v (DISC) 1502-0103-006
C602 .01 mfd,+80-20%, 12v (DISC) 1502-0103-006
C603 15 mfd,+20%, 10v (TANT) 1515-0150-002
C604 .2 mfd,+80-20%, 12v (DISC) 1502-0204-006
C605 .01 mfd,+80-20%, 12v (DISC) 1502-0103-006
C606 25 mfd,10v,85°C (Electrolytic) 1513-0250-001
C607 15 mfd,+20%, 10v (TANT) 1515-0150-002
cé608 -Ol1 mfd,+80-20%, 12v (DISC) 1502-0103-006
C609 .1 mfd,+80-20%, 12v (DISC) 1502-0104-005
C610 .O1 mfd,+80-20%, 12v (DISC) 1502-0103-006
INTEGRATED CIRCUITS
TEGOT ELC 3133-5114-805
TC6O2stAG= 3133-5114-801
Ic603 I.C. (Specify Frequency) 3133-5114-804
TC604) “T2¢ 3133-5114-802
TCOOS TAC 3133-5114-803
mcu B
KL
ITEM
DESCRIPTION
PART NO.
—__ eee > eee
SECTION 6