Lafayette Petrusse User manual

L afayette PETRUSSE
OWNER’S MANUAL
3000 Channels АН-Mode AM /FM /SSB/CW
Deluxe Base Station Trans eiver
AC/DC Power, with ECHO and Roger Веер

TABLE OF CONTENTS
Page
Section 1: Spécifications....................................................................................................................................................................1
Section 2: Installation................................................................................................................................................. 2
Location/Connection ............. i ..................................................... .. .............................................................................................2
Noise Interférence............................................................................ 2
Antennas........................................................................................................................................ 2
Remote Spea er ............. ................................................................................................................................................................2
Public Address................................................................................................................................................................................2
Section 3: Operation .............. ...........................................................................................................................................................3
Control Functions .................................... 4
Rear Panel Connectors................................................................................................................................................................5
Operating Procedure То Receive.................................................................................................................... 6
Operating Procedure То Transmit............................................................................................................................................6
Public Address Operation................................................................................... 6
SWR Measurement. . .. .. ................................................................... 6
Section 4: Maintenance & Adjustment ......................... 7
Circuit Theory.......................................................... 7
Alignment Procedure........................................................................................................................ ................................ 8
Frequency/Channel Chart ................................... 11
PC Board Layout ......................... 12
Schematic Diagram...................................... 15
Replacement Part List.................................................................................................................................................................16

Section 1 Spécification
Than you for your confidence in selecting Lafayette two-
way radio equipment. We now you'll find your transceiver
as exciting as it is practical. Many years of valuable ex
périence designing electronic products are behind our two-
way communications sytstems. Only the highest quality
components are incorporated into Lafayette radios to
assure reliability and maximum performance.
Installing and operating the Lafayette is not complicated,
but the fiexibility provided by its numerous operating
features may not be fuliy appreciated until a little time is
spent becoming familiar with its Controls and connections.
It will be to your advantage to save all the pac ing matériels
-cartons, fi Ilers, cushoning, etc., they will prove valuable in
preventing damage should you ever hâve occasion to
transport or ship the Lafayette.
Spécifications
General Receiver
Channels 3000 Channels AM Sensitivity 1 mV for 10 dB S/N
Modulation Modes CW, FM, AM, USB, LSB FM Sensitivity 1 mV for 20 dB S/N
Frequency Range 26.065 to 28.305 MHz SSB Sensitivity 0.2 mV for 10 dB S/N
Frequency Control Phase-Ioc ed Synthesizer AM/FM Selectivity 5 dB at 4 Hz, 50 dB at 10 Hz
Frequency Tolérance ±0.005% SSB Selectivity 5 dB at 2 Hz
Frequency Stability ±0.003% Image Rejection Morethan 50 dB
Operating Température -30°X to + 50° C IF Rejection Morethan 80 dB at 455 Hz
Range AGC Change in audio output less
Microphone Plug-in [4-pin] ,600 Ohm than 12 dB: from IOm.V to 0.4V
dynamie type Squelch Adjustable -threshold less than
AC input Voltage 220V 60Hz 0.7 mV
DC Input Voltage 13.8 V Audio Frequency 400 to 2,500 Hz
AC Power Consumption 75W Response
Antenna Connectors Standard SO-239 type X2 Oistortion Less than 10% at 2 watts output
[A and B]
Semiconductors 9 IC, 1 FETs, 43 Transistors Adjacent Channel
into 8 Ohms
Meter #1 Indicates relative RF power >75 dB
output/antenna SWR
Indicates received signal strength Rejection
Cross Modulation >50 dB
Meter# 2 Intermediate Frequency 10.695 MHz [Am-1st, SSB],
Transmitter 455 KHz [AM-2nd]
Power Output Low 0.5-AM 0.5-FM 3-SSB(W) Clarifier Range ±5 KHz
Normal 5-AM5-FM 12-SSB(W) Noise blan er IF singlegate type
SSB Generation Dual-balanced modulation Audio Output Power More than 3 watts into 8 Ohms
AM Modulation Class B amplitude, coliectors Built-in Spea er 8 Ohms, dynamie
modulation Externai Spea er Disables internal spea er when
AM Modulation Up to 100% (optional) connected
Capability
FM Deviation ±1,5 KHz @ 1,250 Hz 20 mV
audio
Clarifier Range ±5 KHz
Ffarmonic and Spurious
Emission Betterthan60 dB
AM/FM Frequency 40.0 to 5,000 Hz
Response
SSB Frequency 400 to 3,000 Hz
Response
Output Impédance 50 Ohms unbalanced X2
[A and В]
Output Indicators RF Meter shows relative RF
output power.
- 1 -

Section 2 In tallation
Location/Connection
The transceiver should be placed in a convenient operating
location close to an AC power outlet and the antenna lead-
in cable (s).
The transceiver is attached with the AC power cord set.
Proceed as follows to complété ail necessary connections
to the transceiver.
1 ) Your transceiver has two standard antenna connectors of
type SO-239 both located on rear panel, for easy connec
tion to standard PL-259 coax plugs. If the coax antenna
cable must be made longer, use coax cable with impédance
of 50 ohms, frequency ratings for 27 MHz, and use only
enough cable to suit your needs. This wili insure a proper
impédance match and maximum power transfer from the
transmitter to the antenna.
2) AC Power Operation : Use 110 or 220 volts AC power
for the base station.
Noise Interférence
There are- several inds ot noise interfering you may en-
counter in base station operation. Some of these noise
sources are; fluorescent buzz, nearby commercial broad-
cast, electrical appliance, lawnmower, and electrical storms,
etc. Commercial products are available to reduce inter
férence from these sources. Consult your dealer or СВ/
amateur radio supply shops.
Antennas
For best transmission and réception, your CB transceiver
should use an antenna especiaüy designed for a frequency
of 27 MHz. Antennas are purchased separately and include
installation instructions. Numerous types of CB antennas
are available that range from emphasis on ease of install
ation to emphasis on performance. Often the différence in
performance between many of the antenna is modest. Your
can connect 2 antennas to your CB, or 1 antenna and 1
dummy load. v v
1) Vertical Ground Plane Antennas.
These are omnidirectionai antennas that provide optimum
performance for contacting other fixed stations using
vertical type antennas in addition to ail mobile-stations.
For mediumlong range communications wor .
2) Directional Beam Antennas.
Highly efficient and directional antennas generally intended
for fîxed-to-fixed very long range communications.
Directional Beam
Antenna
Remote Spea er
The external spea er jac (EXT. SP) on the rear panel is
used for remote receiver monitoring. The external spea er
should hâve 8 ohms impédance and be able to handle at
least 3 watts. When the external spea er is piugged in, the
internai spea er is disconnected.
Note. The PHONE jac on the front panel overrides both
external and internai spea ers. When the plug from a head-
phone is piugged to the PHONE jac , both internai and
external spea ers are silenced simultaneously.
Public Address
An external 8 ohm, 3 watt spea er must be connected to
the PA jac located on the rear panel when the transceiver
is used as a public address system. The spea er should be
directed away from the microphone to prevent acoustic
feedbac . Physical séparation or isolation of the micro
phone and spea er is important when operating the PA at
high output levels.
- 2 -

Section 3 Operation
Controls/lndicators
There are 17 Controls and 10 indicators on the front panel of your Lafayette PETRUSSE.
© @ <© ©
1 Power/Qn-off
Place in Power (lever up) position to apply power to the
unit.
2 NB/ANL Switch
When set to NB/ANL, this switch activâtes the noise
blan er and the automatic noise limiter circuits simui-
taneously.
The noise blan er is effective for répétitive impulse type
noise such as ignition interférence and the automatic noise
limiter is used to reduce atmospheric noises.
If you find that the réception is reîatively free of noise, you
can set this switch to OFF for best sensitivity.
3 R. ВЕЕР Switch
This switch serves to switch on or off the roger beep circuit.
Place this switch in R. ВЕЕР to switch on.
4 ECHO Switch
Set this switch to ECHO when you desire to add an echo
effect to your transmitting voice. This switch has no
effect on receiving.
5 Antenna A-В Selector
For switchîng between two types of antennas or dummy
load that may be connected to the unit. You may connect
a ground plane antenna (non-directional) to Antenna A
réceptacle, and a beam type antenna (highly directions!)
to the Antenna B réceptacle on rear panel for long-rangé
communications.
6 SWR-Calibrate Switch
This switch changes the SWR meter function in two ways:
•CALIB (lever down): Used to calibrate the SWR Meter
before measuring your antenna SWR ratio.
• SWR (lever up): Used to directly read the SWR of ante
nna connected to the unit. See Accessory Circuit Oper
ation.
7 Calibrate Control
This control is used for caiibrating the SWR meter for
accurate SWR readout in conjunction with the SWR-
CALIB Switch.
Note:So that the meter functions as RF power meter,
be sure to set this control to fully countercîoc wise posi
tion mar ed RF.
8 Fine Tuning
Permits fine-tuning by changing the receiving frequency
by ± 1 Hz.
9 RF Gain
This control is used primarily to optimize the réception
in strong signal areas. Under normal operating conditions
the control should be turned fully cloc wise. When strong
overloading or distorted signais are received rotate this
control countercîoc wise to reduce gain.
Note: The Squelch Control 15) may require readjustment
with reduced RF Gain control.
10 Microphone Gain
A preamplifier circuit is built into this unit to increase
microphone gain. Experiment with this control for the
setting that will best suit your individual use.
11 Channel Selector
Has 40 detents in a turn and selects one of the channels
desired. Use the Channel selector in conjunction with the
Band Select switch. The seiected channel is digitally dis-
played in the window above the selector.
- 3 -

12 Mode Selector
Selects the mode of operation in either CW, standard FM,
AM or USB and LSB. Transmissions in any mode can only
be commnnicated to .stations operating in the same mode.
13 RF POWER Switch HI-MID-LO
Set this switch to the position that selects the RF power
output you want in AM or FM transmission.
14 Band Select Switch
Used with the channel selector. Selects one of 5 bands of
40 frequencies.. See bac cover to page 11 for information
of channel provision and frequencies,
15 Squelch
This control is used to eut off or eliminate receiver bac -
ground noise in the absence of an incoming signal. For
maximum receiver sensitivity it is desired that the contro!
be adjusted only to the point where the receiver bac -
ground noise or ambient bac ground noise is eiiminated.
Turn fully countercloc wise then slowly cloc wise until
the receiver noise just disappears. Any signal to be received
must now be sîightly stronger than the average received
noise. Further cloc wise rotation will increase the threshold
level which a signal must overcome in order to be heard.
Only strong signais will be heard at a maximum cloc wise
setting.
16 AF Gain
Permits you to adjust the listening level when receiving.
17 VFO
Opérâtes on both TX and RX modes (±5 Hz), ailowing
you to use the inter-channel space. Especially useful in SSB.
18 Phone Jac
Accepts a plug from a headset of 4 to 32 Ohm impédance,
insertion of the plug will silence the built in spea er (and
external spea er connected to External Spea er jac ).
19 Function Indicators
LED indicators located in the LED area permit you to
now instantly the mode to which the unit is engaged.
On Air: Lîghts up during transmit mode indicaîing you are
on-the-air.
CW-FM-AM-USB-LSB: Indicates a corresponding mode
selected by the Mode selector 12).
20 Channel Readout
This is the LED [light emitting diode] digital readout to
indicate the channel selected by the Channel selector.
21 Power/SWR Meter
Used for two purpose - to indicate relative transmitter
power when transmitting and to indicate antenna SWR
[standing wave ratio]. Note that the power meter has
separate scales for AM (FM) and SSB (CW) transmission,
respectively.
22 S [Signal] Meter
The left hand meter provides a relative indication of the
signal strength of a received signai in S units during récep
tion. Note that SSB signais will respond this meter only
during voice modulation. This being due to the fact that
SSB transmissions do not contain a continuous RF carrier
as is found on AM or FM and CW.
23 Push-to-Tal Microphone
The receiver and transmitter are controlled by the Push-to-
Tal switch on the microphone. Press the switch and the
transmitter is activated; release the switch to reçoive. When
transmitting, hold the microphone two inches from the
mouth and spea clearly in a normal voice. The radio cornes
complété with the low impédance dynamie microphone
(supplied). Note: Depressing the Push-to-Tal switch
on the microphone is also required to activate the PA
system.
—4 —

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Rear Panel Conneotors
1 Antenna Réceptacle A/B
Accept PL-259 type coaxial plugs from antenna system.
Switching to connect the transceiver output to either
réceptacle is done with the Antenna A-В switch on the
front panel.
2 PA Spea er Jac
Used for public address operation. The PA spea er should
be connected to thisr jac using 1/8" (3.6mm) diameter
plug. Insertion* of an external spea er into the External
Spea er jac will not interrupt the PA operation.
3 External Spea er Jac
Used to connect an external spea er for extra sound source.
Use 1/8" (3.6mm) diameter plug for connection. Insertion
of the plug into this jac will silence the internai spea er.
4 CW Key
Use for morse code operation. Connect a CW ey to this
jac and place the CW/FM/AM/USB/LSB switch in the CW
position.
5 DC Power Soc et
12 Volt OC power for the unit is fed through this soc et
using the DC power cable supplied. Do not force the DC
power cable into the soc et sińce the soc et pins are
unevenly spaced allowing only one way insertion.
6 Sélective Call Jac
A provision has been made which enables your transceiver
to couple with a sélective call set (availabîe from your
dealer). This jac is used to connect the sélective call set
to the unit, and is normally occupied with a plug prewired
for normal CB operation, Do not remove the plug unless
you are using the jac . Following the deâler's advise and
instruction manuał accompanying the purchased sélective
call set will ensure proper sélective call installation and
operation.
© © © ® ©
7 Fuse
Accomodates a fuse for AC input circuit protection. Use
250V 1A fuse for replacement.
Note. Before replacing the fuse, see your dealer to che.c
to find out the reason why the fuse was biow. Replacing
without chec may only blow the fuse again.
8 AC Power Cord
Connects to AC power outlet for AC mains supply.
9 Frequency Counter Output Jac
The RCA-type (pin) jac is used to connect an optional
frequency counter so that you can watch channel
frequency digitally. The frequency counter readout will
be possible on transmitting only.
10 Recording Output Jac
The RCA-type (pin) jac provides output for connection
to a tape recorder to permit recording of received signais or
your modulating voice.

IMPO RTANT: Ma e sure that the antenna, power source,
and microphone are connected before you operate.
1 ) Set the CB-РА switch to CB position.
2} Turn the unit on by setting the Power Switch to On
position. Now the meters, Channel Indicator, and Function
Indicators will be iliuminated.
:3) Temporarily, set the Mode Switch in AM position.
4) Set the Squelch Control in fully countercloc wise
position and ajust the AF Gain control for a comfortable
listening ievel.
5) Listen to the bac ground noise from the spea er. Turn
the Squelch Control slowly cloc wise until the noise just
disappears (no signai should be present). Leave the Squelch
Control at this setting. The Squelch Control is now pro-
perly adjusted. The receiver will remaän quiet until a singal
is actualy received. Do not advance the Squelch Control
too far cloc wise or some of the wea er signais will not be
heard.
6) Depress the Clarifier and set it to the center (12 o'cloc )
position.
7) Select a desi.red mode of operation, CW, FM, AM, USB
or LSB and adjust the Clarifier.
8) Select a channeî you desire by the Band Select switch,
then by the Channel Selector.
Note. If you want to operate in between channels, puli
out the clarifier nob and rotate it upscale or downscale.
(This also affects in transmitting mode.)
Operating Procedure To Transmit
1) Select the desired channel and mode of transmission.
2) If the channel is elear, depress the Push-to-Tal switch
on the microphone. Spea in a normal tone of voice.
Standby-Beep
A special provision has been built in you radio to give other
stations a sign which tells that you are turning to receive.
Without needing switching operation to activate this feature,
a been tone is automatically transmitted at each time you
release the push-to-tal switch on the microphone to turn
to receive mode.
Microphone gain control
A preamplifier circuit is built into the radio to increase the
microphone gain. Experiment with the control for setting
that will best suit your individual use.
Note. When the microphone gain control is set to
maximum, ambient noise may also be pic ed up by the
microphone. In high noise situations, low microphone gain
setting may produce the best results.
The microphone gain control is also used to adjust PA
loudness.
Operating Procedure To Recei e
To use this feature of the transceiver, a spea er having a
voice coil impédance of 8 to 16 ohms and a power handling
capability of at least 3 watts should be connected ta the
PA SP jac on the rear panel. Be sure that there is physical
séparation between the microphone and the PA spea er
itself. If the PA spea er is located very close to the micro
phone, acoustic feedbac will resuit when the PA amplifier
■is operated at high volume (or when PA is used indoors).
Adjustment of PA volume is made with the MIC GAIN
control.
SWR Measurement
Most antennas are factory tuned, but the antenna efficiency
may be pea ed by slightly adjusting the length of antenna
using the SWR meter built into the unit. This adjustment
may improve the antenna standing wave ratio (SWR). The
SWR permits you to détermine how well matched the
antenna and its cables are to your transceiver.
1) Set the unit in the receive mode as instructed under the
Operating Procedure to Receive section.
2) Set the Mode switch to AM position; the SWR-Cal 6)
switch to the Cal position.
3) Press the Push-to-Tal switch on the microphone and
turn the Calibrate Contro! cloc wise (past dic ) so that the
SWR meter pointer exactly coïncides with the Set mar
on the scale. Release the Push-to-Tal switch.
4) Set the SWR-Cal switch to the SWR position and depress
the Push-to-Tal switch again. The SWR of your antenna is
read directly on the scale.
Note: An SWR below 2 or less is desired as this indicates
that over 95% of the transmitted power is broadcast into
the air.
Public Address Operation
- 6 -

Section 4 Maintenance & Adju tment
Circuit Theory ,
The concept of PLL system frequency synthesization is not
of recent development, however, it has not been a long âge
since the digital theory has been coupled with the PLL
synthesization; technology. Aithough details of the PLL
theory is-somewhat complicated and riot within the scope
of this brochure, we hereby provide the fundamental
theory of it.
PLL Circuitry. PLL is an abbreviation of the phase-loc ed
ioop which is fundamentary composed of a closed loop
feedbac circuit. The feedbac component is the balance of
frequency drifts and the PLL circuit acts to cancel it out.
То detect out the frequency drift of the PLL output, a
fîxed reference oscillator (10 Hz, 1/1024 divided down
from 10.240 MHz) is compared constantly with the input
frequency (10 Hz).'The input frequency is obtained by
dividing the VCO frequency. A functional bloc diagram
is provided below ander 'PLL Circuit' for the easier under-
standing.
Off-Set frequency oscillator TR-29 The off-set-frequency
oscillator' TR-29 oscillâtes at 14.460 MHz for ail band
Switching bejween these oscillating frequencies is made by
biasing the diodes D 97 to D111.
The off-set frequency signal is obtained at TR-29 emitter
and flows through L-16 and C-88 into TR-25 mixer where
it is beat with the VCO signal. The VCO signal is obtained
from the following:
f vco ^ off-set+ Nfr
Where, fVco = VCO frequency, N - programming code for
divider output, fr =<eference frequency step, 0.01 MHz.
i.e. At channel #1 in band A, and AM band corresponding
N code is 91.
TRANSMITTER
PLI
CIRCUIT
FM MOO
1C6
MIC ДМР
IC 9 TR65/66 TR66 TR63
TX MIXER 1—I DRlVERsTH DRIVES 1— fPO W ER'
_ ,— L.C.6 ..... .
J -------- F PW R>
TX
OUT
FL3
X'TAL
-TRS1-
IC3
BALANCE MOD
SSB MOD.
10.6975MHz TR30
Hflh-Г ose
ж— I
TR30 I
ose H
AM MOD.
f vco = 14.460 +91 X 0.01 = 15.370 MHz
Since the mixer output is determined by two factors-the
off- set frequency output (dependent on band selector
switch) and the VCO output, the mixer output contains
the subtracted frequencies of 0.91. to 3.15 MHz. These
frequencies appear’in pin #2 of IC-1 through C-82, and
divided by the progrrammable divider in IC-1 down to 10
KHz which is compared with another 10 K Hz signal ob
tained from the reference oscillator (10.240 MHz).
The VCO output is mixed with the off-set frequency signal
and applied to the TX mixer IC-9 through band-pass filters
L-43 and 1-44. i.e. At channel 1 in band A, and AM band,
the TX mixer IC-9 accepts 15.370 + 10.695 M Hz = 26.065
MHz is TX frequency. The mised with 10.695 MHz signai
from Tr-30. When receiving channel 1 in band A (26.065
MHz), the Ist RX mixerTR-18accepts 15.370 local signal
at its base, and converts down it to 10.695 MHz IF (for
AM/FM modes, this is the 1 st intermediate frequency).
TR-18 off-sets the 10.695 MHz signal so that TR-30 сап
oscillâtes at 10.6975 MHz for LSB.
PLL circuit
TR25
MIXER 15.37-17.61 MHz
OUT
TR29 TR26 TR27
OSC I --- Ißt— 19Л60М№ 1 VCO I --- [bÜFFER 1
0.9l-3.l5 M Hz
1
5 LPF J PHASE ] SET
BUFFER I ------ 1 PROGRAM OIV.| ------ H X > - --------- |1/Ю 2б CIV|
TR26 I С 5
10.26MHz —Ч0|—I ose
RECEIVER
PLL
CIRCUIT
10.26 MHz
15.37
I
17.61
MHz
ANT TRl7 TRI8
__
RF AMP h-f MIXER
10.695 TR30
МНг нам OSC~
XF
p i l - HSSB IF m SSB IF H—(PROD DÉrh
TR19 TR20/21 /22 TRlS
ITR8 CF655KHZ TR62/1C8
AM MIX |—|~CF 4 AF POWER SP
OUT
CfFM PET
“Tel j AM 1F j
---- 1AM DET [
TR9/10/11 TR23
7

Alignment Procedure
1- Measurement Condition
(1) Reference température _____________ ,25°C
(2) Reference humidity ________________ 65%
Note: Unless otherwise specified, alignment may be perfor-
med under the room température of 5°- 35° C and the
room humidity of 45 - 80%.
3) Power supply ______________ AC 110V or 220V ±3%
2 - Test Equipment. All test equipment should be properly
calibrated.
a) 50 Ohms résistive antenna load, 20W.
b) Frequency counter operable in the required frequency
range.
c) HF signal generator operable over 50 Hz to 60 MHz.
d) Synchroschope, 0-100 MHz, high input Z.
e) FM déviation meter.
f) Digital Voltmeter
g) 8 Ohms 5W résistive spea er load.
h) Two audio signal generators, 10 Hz to 20 Hz, atténu
ative.
i) .RF Wattmeter, 50 ohm/15 watt, thermocoupled.
j) Circuit tester, input impédance 20 Ohm/V.
) Regulated DC power supply, more than 4A.
l) Dummy microphone plugs, receiveand transmit mode.
m) VTVM, 0.1 mV measurabie.
3 - PLL Circuit Alignment
A. [10.24 MHz] Reference Frequency Adjustment
(Chec )
1) Connect ferquency counter to pin terminal be-
tween C-78 and C-79.
2} Chec counter reads 10.24000 MHz.
3) Tolérance within ±200 Hz is acceptable. Other
wise, replace X-1 (10.24 MHz).
B. [10.695/10.6925/10.6975 MHz] Adjustment.
1 ) Connect frequency counter to TP-6.
2) 10.695 MHz: Set the mode selector to CW. Adjust
L-26 to 10.695 MHz + 0,-100 Hz.
3) 10.6925 MHz: Reset Mode Selector to USB.
Adjust L-27 to 10.6925 MHz, + 0, -100 Hz.
4) 10.6975 MHz: Reset Mode Selector to LSB.
Adjust L-28 to 10.6975 MHz, + 0, -100 Hz.
C. PLL Input Level Adjustment
1) Set the mode selector to AM, and the clarifier
Control to center, and set the band selector to
Position C of CH 19.
2) Connect synchroscope to TP-4 (pin terminal
between the C-82 anu R-107).
3) Adjust L-16 for maximum RF output.
D. [VC0] Adjustment
1) Set the mode selector to AM, and the clarifier
control to center, and set the band selector to
position E with CH 40.
2) Connect synchroscope to TP-3.
3} Adjust L-18 for maximum RF output.
4} Connect DC Voltmeter to TP-2 .(pin termin
between the R-109 and R-258 from IC-5).
5) Adjust L-17 to DC 5.0+ 0.1 V.
6) Chec A band of CH7, must be DC 1.5V minimur
E. [Off -set Frequency] Adjustment >■
1) Connect frequency counter to TP-3 (pin termin
of L-18).
2) Set the Mode Selector to AM, and the Clarifi
Control to center.
3) Set the Band Selector to position C of CH1
4) Adjust L-19 for 16,040 MHz ±50 Hz.
5) Set the mode Selector to USB.
6) Adjust L-20 for 16.0425 MHz±50 Hz.
7) Set the mode Selector to LSB.
8) Adjust L-21 for 16.0375 MHz±50 Hz.
9) Set the mode Selector to LSB. and transmit
station.
10) Adjust VR-15 for 16.0375 MHz ±50 Hz.
4.- Transmitter Alignment
A. Testset-up
Connect testing unit to the unit as shown:
Dummy Rlug.**
А1Л1О Input
(АМ ЛД &В) (SS6)
- 8 -

B. RF Power Transistor of Current Adjustment
1) Set the mode selector to USB, and the band
selector to C of CH 19.
2) Connect current meter to TP-9 (+) and TP-8 (-).
3) Adjust VR 1 î to 10 ± 0.5 mA.
4) Connect current meter to TP-9 (+) and TP-7 (-).
5) Adjust VR 10 to 10Û±5 mA.
C. RF Power Amplifier Adjustment
1 ) Set the Mode Selector to USB.
2) Apply 1,000 Hz 30 mV audio to microphone in-
put circuit (use dummy microphone plug).
3) Set the band Selector to E with CH40.
4) Adjust VR-12 and L-42 for maximum RF output.
5) Adjust L-40, L-43, L-44 and L-33 for maximum
RF output.
6) Repeat steps 3) through 5) until no further im-
provement is obtained.
7) Adjust L-42 for balance of E band CH40 and A
band CH1 with RF output.
D. Two-Tone Adjustment
1 ) Apply 500 Hz a.nd 2,400 Hz (30 mV) audio tones
to the microphone input circuit at the same time.
Use two audio signal generator set with attenu-
ators.
2) Adjust test audio levels of 500 Hz generator by
means of attenuator on the generator so that the
scope present wave figure li e 'A' as shown below.
3) Adjust VR-12 to 12 W p-p power output.
E. AM/FM/CW RF Power Output Adjustment
1 ) Set the Mode Selector to AM.
2) Select the Band Selector to C.
3) Select the Channel Selector to 19.
4) Adjust VR-13 for 5 W RF power output.
F. AM Modulation Adjustment
1 ) Apply 1,000 Hz 30 mV audio to the unît.
2) Adjust VR-14 for modulation depth of gerater
than 90%.
G. FM Deviation Adjustment
1 ) Set the Mode Selector to FM.
2) Apply 1,000 Hz 30 mV audio to modulation
circuit. Use dummy microphone plug.
3) Connect déviation meter (or linear detector) to
antenna output on the unit.
4) Adjust VR-5 to obtain 2-3 KHz.
H. RF power Meter Adjustment
1 ) Set the Mode Selector to AM.
2) Comparing the reading of externat RF power and
the buîlt-in meter, Adjust VR-8 for equal indic
ation on the unit power meter.
I. CW Tone Level Adjustment
1 ) Set the mode selector to CW.
2) Connet 8 Ohm dummy load and AF VTVM to
ext S.P jac , and connect a ey sw to ey sw Jac .
3) Key sw on and adjust VR-16 to 200 ± 10 mV.
Reference -SSB Two-Tone Alignment
Important: RV-12 (bias)
Adjustment: RV-12 should
not be rotated cloc wise
beyond 2 o'cloc position,
or the RF power transistor
will be destroyed.
A. Properiy adjusted transmitter. B. Unequai tones-Adjust generator
Outputs to balance.
C. Excessi e modulation - Adjust
RV12 counterclockwise.
E. Undermodulation-Adjust RV 12
clockwise.
D. Final transistor incorrectly bias-
ed-Adjust RV 12.
F. Similar to A but showing hum-
Cbeck for proper testing condi
tion.
- 9

5.- Receiver Alignment
Л. Test set-up
Connect testing equipment to the unit as shown:
AC Power -3%
D. FM IF/Demodulator Alignment (FM Sensitivity
Adjustment)
1) Select channei 19 in Band C, set the Mode Selector
to FM.
2) Set signal-generator to 27.185 MHz.
3) Apply FM signal (1 яУ, 1.5 KHz déviation with 1
KHz audio) to unit.
4) Readjust L-5 for maximum audio output.
E. Squelch Adjustment
1 ) Set the Mode Selector to AM.
2) Set signal generator to provide RF input signal of
60 dB (1000 fV), 1 KHz 30% modulated, and
rotate squelch control to the fully cloc wise
position.
3) Connect scope to spea er output terminal. Adjust
VR-4 to a point at which audio output is criticaily
disappeared on scope.
Chec the Squelch circuit will opeate within 48-70
dB at ail modes. SSB RX squelch is automatically
adjust by VR-3 and requîtes no particular adjust
ment.
F. S-Meter Adjustment
1 ) Set the Mode Selector to AM.
2) Adjust signal gererator output to 40 dB (100 лУ).
3) Adjust VR-1 so that S-meter indicates '9' on the
unit meter scale.
4) Set the Mode Selector to USB.
5) Adjust VR-2 so that S-meter indicates '9'.
G. Noise bla er Adjustment
1) Set the mod selsctor to AM, select channel 40
in band A.
2) Set signal generator to 26.945 MHz (CH 39
position) without Modulation, RF input signal
of 40 dB (100 ,‘<V).
3) The NB/ANL SW ON.
4) Connet OC voltmeter to TP-1.
5) Adjust L-1 and L-2 to obtain DC 2-3V.
8.. AM Sensitivity Adjustment
1) Set signal generator to 27.185 MHz 30% modul
ation.
2) Set the Channel Selector 19 in Band C.
3) Set the Mode Selector to AM.
4) Adjust L3, L4, L6, L7, L8, HO, L11, and L12
for maximum audio output From spea er nutput
' terminais (across dummy îoad).
NOTE: Keep generator output level as low as
possible to avoid AGC action.
5) ' After completing above; adjust L-8 for balance A
band and E band.
C. SSB Sensitivity Adjustment
1) Set signal generator to 27.186 MHz. without
Modulation.
2) Set the Channel Selector to channel 19 in Band C.
3) Set the Mode Selector to USB.
4) Adjust L-13 and L-14 for maximum audio output.
Set clarifier to center.
“ 10:

Frequency/Channel Chart
A-Band В-Band C-Band D-Band E-Band
Channel MHz Frequency Channel MHz
Frequency Channel MHz
Frequency Channel MHz
Frequency Channel MHz
Frequency
1. ' 26.065 1. 26.515 1. 26.965 1. 27.415 1. 27.865
2. 26.075 2. 26.525 2. ' 26.975 2. 27.425 2. 27.875
3. 26.085 з; 26.535 3. 26.985 3. 27.435 3. 27.885
4. 26.105 4. 26.555 4. 27.005 4. 27.455 4. 27.905
5. 26.115 5. 27.565 5. 27.015 5. 27.465 5. 27.915
6. 26.125 6. 26.575 6. 27.025 6. 27.475 6. 27.925
7. 26.135 7. 26.585 7. 27.035 7. 27.485 7. 27.935
8. 26.155 8. 26.605 8. 27.055 8. 27.505 8. 27.955
9. 26.165 9. 26.615 9. 27.065 9. 27.515 9. 27.965
10. 26.175 10. 26.625 10. 27.075 10. 27.525 10. 27.975
11. 26.185 11. 26.635 11. . 27.085 11. 27.535 11. 27.985
12. 26.205 12. 26.655 12. 27.105 12. 27.555 12. 28.005
13. 26.215 13. 26.665 13. 27.115 13. 27.565 13. 28.015
14. 26.225 14. 26.675 14. 27.125 14. 27.575 14. 28.025
15. 26.235 15. 26.685 15. 27.135 15. 27.585 15. 28.035
16. 26.255 16. 26.705 16. 27.155 16. 27.605 16. 28.055
17. 26.265 17. 26.715 17. 27.165 17. 27.615 17. 28.065
18. 26.275 18. 26.725 18. 27.175 18. 27.625 18. 28.075
19. 26.285 19. 26.735 19. 27.185 19. 27.635 19. 28.085
20. 26.305 20. 26.755 20. 27.205 20. 27.655 20. 28.105
21. 26.315 21. 26.765 ; 21. 27.215 21. 27.665 21. 28.115
22. 26.325 22. 26.775 22. 27.225 22. 27.675 22. 28.125
23. 26.355 23. 26.805 23. 27.255 23. 27.705 23. 28.155
24. 26.335 24. 26.785 24. 27.235 24. 27.685 24. 28.135
25. 26.345 25. 26.795 25. 27.245 25. 27.695 25. 28.145
26. 26.365 26. 26.815 26. 27.265 26. 27.715 26. 28.165
27. 26.375 27. 26.825 27. 27.275 27. 27.725 27. 28.175
28. 26.385 28. 26.835 28. 27.285 28. 27.735 28. 28.185
29. 26.395 29. 26.845 29. 27.295 29. 27.745 29. 28.195
30. 26.405 30. 26.855 30. 27.305 30. 27.755 30. 28.205
31. 26.415 31. 26.865 31. 27.315 31. 27.765 31. 28.215
32. 26.425 32. 26.875 32. 27.325 32. 27.775 32. 28.225
33. 26.435 33. 26.885 33. 27.335 33. 27.785 33. 28.235
34. 26.445 34. 26.895 34. 27.345 34. 27.795 34. 28.245
35. 26.455 35. 26.905 35. 27.355 35. 27.805 35. 28.255
36. 26.465 36. 26.915 36. 27.365 36. 27.815 36. 28.265
37. 26.475 37. 26.925 37. 27.375 37. 27.825 37. 28.275
38. 26.485 38. 26.935 38. 27.385 38. 27.835 38. 28.285
39. 26.495 39. 26.945 39. 27.395 39. 27.845 39. 28.295
40. 26:505 40. 26.955 40. 27.405 40. 27.855 40. 28.305
- 1 1 -

PC Board Layout
EPTOSSB60Z Power Supply
EPTOSSB70Z Aritenna Selector
EPTOSSB30Z Channel Selector

PC Board Layout
SWR RF
SW POWER СВ/РД ANL NB
EPTOSSB80Z Function Selector
EPÏ0SSB4ÛZ Channel Readout
EPT0SSB50Z ECHO
EPT360040Z SWR
13
0402 0401

EPT360010Z Main Board
PC
■14-

Schematic Diagram
- 1 5 -

TIME

Replacement Part List
Circuit Sym ol Description Part NO. Circuit Sym ol Description Part NO.
R216 Resistor Car on RCP 141094Z R3, 86. Resistor Car on RCU 146814Z
1 ohm MW 680 ohm MW
R218 Resistor Car on RCP 142294Z R 67 Resistor Car on RCU 148214Z
2.2 ohm MW 820 ohm MW
R410 Resistor Car on RCP 141014Z R 33, 53, 59, 65, Resistor Car on RCU 141024Z
100 ohm MW 91,104,105, T K ohm MW
R 402 Resistor Car on RCP 141514Z 110,112,147,
150 ohm MW 149, 150,151,
R196 Resistor Car on RCP 146814Z 157, 172,209,
680 ohm MW 214, 236, 311,
R192 Resistor Car on RCP141024Z 312,313,315,
1 K ohm MW 316, 317,319,
R74 Resistor Car on RCP 142224Z 320, 323, 324,
2,2Kohm MW 701,804,809,
R23 Resistor Car on RCP142724Z 811.
2.7 K ohm MW R82,177. Resistor Carbon RCU 141224Z
R102, 107, 106, Resistor Car on RCP143324Z 1.2K ohm MW
250. 3.3Kohm MW R18,81,90,190 Resistor Car on RCU 141524Z
R 47 Resistor Car on RCP 143924Z 193,221,227. 1.5K ohm MW
3.9 K ohm MW R233 Resistor Car on RCU 141824Z
R79 Resistor Car on RCP 141034Z 1.8K ohm MW
10K ohm MW RI 7,24,64,68, Resistor Car on RCU 142224Z
R195 Resistor Car on RCP 142234Z 87, 108, 113, 2.2K ohm MW
22K ohm MW 155,180,189,
R131 Resistor Car on RCP 144734Z 191,257,803,
47 K ohm MW 805,807.
R 253 Resistor Car on R CM 143304B R7, 25, Resistor Car on RCU 142724Z
33 ohm MW 2.7K ohm MW
R9, 94. Resistor Car on RCM 146804B R16, 22,51,52, Resistor Car on RCU 143324Z
68 ohm MW 58,95,115, • 3.3K ohm MW
R30, 161,237. Resistor Car on RCM 141014B 141,158,202,
100 ohm MW 244,245,259.
R154 Resistor Car on RCM 142214B R50, 124. Resistor Car on RCU 143924Z
220 ohm MW 3.9 K ohm MW
R 44 Resistor Car on RCM 146814B R77,146,156, Resistor Car on RCU 144724Z
680 ohm MW 178,182, 183, 4,7 K ohm MW
R56, 66, 80, 140 Resistor Car on RCM 141024B 185,186,207,
200,211,212, 1 K ohm MW 802,808.
313,314,321, R78,85, 184, Resistor Car on RCU 145624Z
322, 403. 239,801. 5.6K ohm MW
R48, 226. Resistor Car on RCM 141524B R12, 31,35,63, Resistor Car on RCU 146824Z
1.5Kohm MW 76,119,148, 6.8 K ohm MW
R 205 Resistor Car on RCM 141824B 254.
1.8Kohm MW R83, 248. Resistor Car on RCU 148224Z
R251 Resistor Car on RCM 142224B 8,2K ohm MW
2,2Kohm MW R1,11,14,57, Resistor Car on RCU 141034Z
R163, 238. Resistor Car on RCM 145624B 61,62,71,114 10K ohm MW
5.6Kohm MW 117,123,142,
R49,164, 197, Resistor Car on RCM 141034B 152,153,160,
249. 1oK ohm MW 169, 174,187,
R 229 Resistor Car on RCM 141834B 194, 206, 134,
18K ohm MW 242,258,404,
R 38 Resistor Car on RCM 143934B 806,810.
39K ohm MW R173 Resistor Car on RCU 141234Z
R 27 Resistor Car on RCM 1447 34B 12K ohm MW
47 IC ohm MW R118,166. Resistor Car on RCU 141534Z
R 39 Resistor Car on RCM 142224B 15K ohm MW
220Kohm MW R84, 96, 144. Resistor Car on RCU 142234Z
R 204 Resistor Car on RCM 144744B 22 K ohm MW
470Kohm MW R 235 Resistor Car on RCU 142734Z
R220 Resistor Car on RCU 141Q04Z 27 K ohm MW
10 ohm MW R2 Resistor Car on RCU 143334Z
R241 Resistor Car on RCU 141504Z 33K ohm MW
15 ohm MW R6, 54,55,89, Resistor Car on RCU 144734Z
RI 99,215,224, Resistor Car on RCU 144704Z 125,126,127, 47 K ohm MW
252. 47 ohm MW 128,129,130,
R111, 121,198, Resistor Car on RCU 145604Z 132,133,134,
203. 56 ohm MW 135,136,137,
R26, 32,69,70, Resistor Car on RCU 141014Z 138,139, 171,
73, 88,162, 100 ohm MW 201,263,
230, 231. R19,75,99,101. Resistor Car on RCU 146834Z
R28,93, 219, Resistor Car on RCU 141514Z 68 K ohm MW
223. 150 ohm MW R37, 72. Resistor Car on RCU 148234Z
R21, 120. Resistor Car on RCU 141814Z 82 K ohm MW
180 ohm MW R10, 36,41,42, Resistor Car on RCU 141044Z
R4, 256. Resistor Car on RCU 142214Z 45,46,97,98. 100K ohm MW
220 ohm MW 167,170,247.
R29, 92. Resistor Car on RCU 142714Z R106,122,181, Resistor Car on RCU 142244Z
270 ohm MW 188. 220K ohm MW
R5,8,15,20, Resistor Car on RCU 143314Z R43, 159,260. Resistor Car on RCU142744Z
222,225. 330 ohm MW 270K ohm MW
R 60, 143, 175, Resistor Car on RCU 144714Z R103 , Resistor Car on RCU 143944Z
208,228,246, 470 ohm MW 390K ohm MW
255, 261,318. R13, 168. Resistor Car on RCU144744Z
R145, 232, 240. Resistor Car on RCU 145614Z 470K ohm MW
560 ohm MW
1 6 -

Circuit Sym ol Description Part NO. Circuit Sym ol Description Part NÖ.
R165 Resistor Car on RCU145644Z C72 Capacitor Ceramic CC0500501L
560K ohm %W 5 PFSL50WV
R210 Resistor Car on RCU 146844Z C1,49,97,123. Capacitor Ceramic CC05Û1004L
680K ohm ’/iW 10 PFSL50WV
R217, 243. Resistor Car on RCP 121514Z C88 Capacitor Ceramic CC0501504L
150 ohm У»W 15 PFSL50WV
R213, (-70) Resistor Car on RCP 121034Z C73 Capacitor Ceramic CC0501804L
10K ohm %W 18 PF SL 50WV
R604, 702. Resistor Car on RCP 104704Z C80.94. Capacitor Ceramic CC0502204L
47 ohm 1W 22 PF SL 50WV
R605 Resitor Car on RCP 101014Z C34 Capacitor Ceramic CC0502704L
100 ohm 1W 27 PF SL 50WV
R606 Resistor Car on RCP 102214Z C83 Capacitor Ceramic CC0503304L
220 ohm 1W 33 PF SL 50WV
R602, 603. Resistor Car on RCP 108214Z C22 Capacitor Ceramic CC0506804L
820 ohm 1W 68 PF SL 50WV
R601 Resistor Car on RCP101224Z : C8 Capacitor Ceramic CC0508204 L
1.2K ohmIW 82 ,PF SL 50WV
C4.67. Capacitor Ceramic
100 PFSL50WV CC0501015L
C114,160. Capacitor Ceramic CC0501515L
CIO Capacitor/E CE 0504747Z 150- PFSL50WV
0.47 uF 50WV C54 Capacitor Ceramic CC0501815L
C24, 71,128,132 Capacitor/E CE 0501057Z 180 PF SL 50WV
143, 157,164, 1 uF 50WV C70 Capacitor Ceramic CC0502215L
804. 220 PF SL 50WV
C126, 134, 174, Capacitor/E CE 0252257Z C29, 77,96,115 Capacitor Ceramic CC0502715 L
193. 2.2 uF 25WV 180. 270 PF SL 50WV
C105, 151. Capacitor/E CE 0254757Z C11.15. Capacitor Ceramic CC0503315L
4.7 ■ uF 25WV 330 PF SL 50WV
C12, 19,20.44, Capacitor/E CE 01610672 C178 Capacitor Ceramic CC0504715L
133, 198. 10 uF 16WV 470 PF SL 50WV
C40, 103,150, Capacitor/E CE 0162267Z C91,95, Capacitor Ceramic CC0505615L
186. 22 uF 16WV 560 PF SL 50WV
C26, 31,32,35, Capacitor/E CE 0164767Z C7, 47,50, 53, 55 Capacitor Ceramic CC0501027L
37, 122,146, 47 uF 16WV 57,82,110,111 0.001 uF SL 50WV
156,803,805. 112,119,130,
C86,131,190, Capacitor/E CE 01 61077Z 144, 205,206.
701,702. 100 uF 16WV C30, 42,45,46, Capacitor Ceramic CC0504727L
C604 Capacitor/E CE 0351077Z 502. 0.0047uF SL 50WV
100 uF 35WV C2, 3, 6,9,14, Capacitor Ceramic CC0501037L
C145,199. Capacitor/E CE 0163377Z 16, 51,56, 60, 0.01 uF SL 50WV
330 uF 16WV 63,64,69,85,
C194, 195. Capacitor/E CE 0251087 Z 98,99,101,102
1000 uF 25WV 108,113,121,
C603 Capacitor/E CE 0353387Z 176,183,185,
3300 uF 35WV 205,401,402,
506,507,601,
701,
C125 Capacitor/T CT0351045Z C5,17,23,48,61 Capacitor Ceramic CC0504737L
0.1 uF 35WV B2; 65, 66, 68, 0.047 u F SL 50WV
C129 Capacitor/T CT 0252245Z 100,109,120,
0.22 uF 25WV 127,135,159,
C81 Capacitor/T CT 01647 45Z 181,188,189,
0.47 uF 16WV 202,203, 204,
C84 Capacitor/T CT 0162255Z 603.
2.2 uF 16WV C169 Capacitor Ceramic
0.1 uF SL 50WV CC0501047 L
C179 Capacitor Ceramic CC0504726S
C90 • Capacitor Myiar CM 0501525Z 0.0047 uFD 50WV
0.0015uF 50WV C173, 177,184, Capacitor Ceramic CC0501036S
C13 Capacitor Myiar CM 0502225Z 200,201. 0.01 uF D 50WV
0.0022uF 50WV C602, 606. Capacitor Ceramic CC0502237L
C137, 138. Capacitor Myiar CM 0504725Z 0,022 uF SL 100WV
0.0047 uF 50WV
C27,28, 36,148, Capacitor Myiar CM 0501025Z
192. 0.001 uF 50WV
C41, 104, 140, Capacitor Myiar CM 0501035Z C87, 162. Capacitor Ceramic CC0500505G
141,142, 152, 0.01 uF 50WV 5 PF 50WV (UJ)
168. C92 Capacitor Ceramic CC0500805G
Cl 36 Capacitor Myiar CM 0501 535Z 8 PF 50WV (UJ)
0.015 uF 50WV C88 Capacitor Ceramic CC0501505G
C38, 139,153, Capacitor Myiar CM 0502235Z 15 PF 50WV (UJ)
187. 0.022 uF 50WV C75, 106. Capacitor Ceramic CC0506805G
C18, 33, 89, 154 Capacitor Myiar CM 05047 35Z 68 PF 50WV (UJ)
191,802. 0.047 uF 50WV C91 Capacitor Ceramic CC0501015G
C147 Capacitor Myiar CM 0506835Z 100 PF 50WV (UJ)
0.Û68uF 50 WV Cl 67 Capacitor Ceramic CC05Q2215G
C39, 149,155, Capacitor Myiar CM 0501045Z 220 PF 50Wv (UJ)
172. 0.1 uF 50WV C107,175. Capacitor Ceramic
270 PF 50WV (UJ) CC0502715G
C79 Capacitor Ceramic CC0503915G
C161 Capacitor Ceramic CC 0500101 L 390 PF 50WV (UJ)
1 PF SL 50WV C165,166,177. Capacitor Ceramic CC0504715G
C52, 58,59, 182. Capacitor Ceramic CC 0500301 L 470 PF 50WV (UJ)
3 PF SL 50WV C170 Capacitor Ceramic CC0505615G
560 PF 50WV (UJ)
- 1 7 -