PRESIDENT FRANKLIN User manual

Section 1 Spécification
Jhank vou for your confidence in sélection Our two-
way radio equipment. We know you'll find your transceiver
as e citing as it is practical. Many years of valuable e 
périence designing electronic products arc bchind our two-
way communications sytstems. Only the highest quality
compunents are incorporated into SSB radios to assure
assure reliability anB ma imum performance.
Installing and operating tfie SSB is nol complicated,
but the fle ibility provided by its numerous operating
features may not be fuily appreciated until a little time is
spent becoming familier with its Controls and connections.
It will be to your advantage to savc all the packing materiels
-cartons, fillers, cushoning, etc., they will prove valuable in
preventing damage should you ever hâve occasion to
transport or ship the SSB.
Spécifications
General
Channels 3000 channals Receiver
AM Sensitivity 1 /-V for 10C8S/N
Modulation Modes CW. FM, AM. USB, LS B FM Sensitivity 1 eV for 20 dB S/N
Frequency Range 26.065 to 28.305 MHz SSB Sensitivity 0.2 «V for 10 dB S/N
Frequ8ncy Control Phase-Iocked Synthesizer AM/FM Selectivity 5cBat4 kHz, 50dBat 10 kHz
Frequency Tolérance *0.005% SSB Selectivity 5 dB at 2 kHz
Frequency Stability *0.003% Image Rejection More than 50 dB
Operating Température -30"C to + 50° C IF Rejection More than 80 dB at 455 kHz
Range AGC Change in audio output less
Micruphone Plug-in [4-pin], 600 Ohm than 12dB:from IG^Vto 0.4V
dynamie type Squelch Adjustable -threshold less than
AC Input Voltage 110V 5CHz (22CV 60Hz) 0.7 mV
AC Piwar Consumption 75W Audio Frequency 400 to 2,500 Hz
Antenna Connectors Standard SO-239 type X2 Response
|Aand B] Distortion Less than 10% et 2 wâtts output
Semicorductors 6 IC, 1 FETs,43 Transistors into 8 Ohms
Meter »1 Indicates relative RF power
output/antenna SWR Adjacent Channel >75 dB
Meters? Indicates received signal strength Rejection >50 dB
10.695MHz [Am-1st,SSB],
Transmitter Cross Modulation
Intermediate Frequency
Power Cütput Low 0.5-AM 0.5-FM 3-SSB(W) Clarifier Range 455 KHz [AM-2nd]
Normal 5-AM 5-FM 12-SSB(W) =5 KHz
SSB Generation Dual-balanced modulation Noise blanker !F single gete type
AM Modulation Class B amplitude, culleclors Audio Output Power More than 3 watts into 8 Ohms
modulation Built-in Speaker 8 Ohms, dynamie
AM Modulation Up to 1C0% E îernal Speaker Disables internai speaker whan
Capability (optional) connected
FM Déviation
Clerifier Range
Harmonie and Spurious
Emission
AM/FM Frequency
Response
SSB Frequency
Resoonse
Output Impédance
[A and B]
Output Indicators
*1.5 KHz @ 1,250 Hz 20 mV
audio
-5 KHz y
Better titan 60 dB
400 to 5,000 Hz
400 to 3,000 Hz
50 Ohms unbalanced X2
RF Meter shows relative RF
output power.
-
- 1 -

Section 2 Installation
Location/Connection
The transceiver should be placed in a conveniez operatirg
location close to on AC power outlet and theantenna lead-
in cable (s).
The transceiver is attached wi:h ths 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, fnr easy connec
tion to standard PI -259 noa plugs. If the coa antenna
cable must be Tade longer, use cca cable with impédance
of 50 ohms, frequency ratings for 27 MHz. and use only
enough cable to suit ycur needs. This will insure a proper
impédance match and ma imum power transfer from the
transmitter to the antenna.
2) AC Power Operation : Use 110 (220) volts AC power
for the base station.
Noise Interférence
Thorc are scveral kinds of noise interfering you may en-
countcr in base station operation. Scme of these noise
sources are; fluorescent buzz, nearby commercial broad-
cast, electrical appliance, lawnmower, and electricalstorms,
etc. Commercial products are available to reduce inter
férence frem these sources. Consult your dealer or СВ/
amateur radio supply shops.
Antennas
For best transmission and réception, your CB transceiver
shoulO use an antenna especially designed for a frequency
of 27 MHz. Antennas are puichased separately and include
installation instructions. Numerous types of CB antennas
are available thaï 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 C8, or 1 antenna and 1
dummy loäd.
1) Vertical Ground Plane Antennas.
These are omnidirectional antennas that provide optimum
performance for contacting other fi ed stations using
vertical type antennas in addition to all mobile stations.
For mediumlong range communications work.
2) Oirectiunal Beam Antennas.
Highly efficient and directional antennas çenerally intended
for fi ed-to-fi ed very long range communications.
Directional Beam
Antenna
Remote Speaker
The e ternal speaker jack (EXT. SP) on the геэг panel is
used for remote receiver monitoring. The e ternal speaker
should hâve 8 ohms impédance and be able to handle at
least 3 watts. When the e ternal speaker is pluggeri in. the
internai speaker is disconnected.
Note. The PHONE jack on tire front panel overrides both
e ternal and internai speakers. When the plug from a head-
phone is plugged to the PHONF jack. both internai and
e ternal speakers aresilenced simulteneously.
Public Address
An e ternal 8 ohm, 3 watt speaker must be connected to
the PA jack located on the rear panel when the transceiver
is used as a public address system. The speaker should be
directed away from the microphone to prevent ocoustic
feedback. Physical séparation or isolation of the micro
phone and soeaker is important when operating tho PA at
high output levels.
2 -

Section 3 Operation
Controls/Indicators
There are 17 contrais and 10 indicators on the tront panel от your SSB.
Control Functions
1 Power/Qn-off
Place in Power (lever np) position to apply power tp the
unit.
2 RB Switch
This switch activâtes the ROGER ВЕЕР circuit when
placed in R3 (lever up) position.
3 NB + ANLSwitcli
This switch activâtes the noise blanker circuit and the
automatic noise limiter in the audio when placed in NB
+ ANL (lever up} position.
4 CB-РА Switch
This switch selects the public address mode of the trans-
ce-ver. The PA tunction should not be used unless ап c -
ternal speaker is connected to the PA SP jack on the rear
panel. See the Public Address Operation on page 6.
5 RF Power Select Switch
Ouring AM or FM ope'atiun, with this switch placed in the
RF Power position, iliu transceiver will produce füll rated
transmit power for long range communication. The Low
position will produce lower transmit power fer shorter
range communication.
6 SWR-Calibrate Switch
This switch changes the SWR mater function in two ways:
• CALIB (lever down): Used to caiibrate the SWR Meter
be'ore meas iring your antenna SWR ratio.
• SWR (lever up): Used to directly read the SWR o< ante
nna connected to :he unit. See Accessory Circuit Oper
ation.
7 Caiibrate Control
This control is used for cal(brating the SWR meter for
accurate SWR readout in conjunction with the SWR-
CALIB Switch.
Note: So that the metei functions as RF power meter.
be sure to set this control to fully counterclockwise posi
tion marken RF.
8 Tone Control
This changes tonal sound quality when receiviny. Cluckwise
rotation will enphasize thte high tone.
9 RF Gain
This control is used primarily tu cptirrize the réception
in strong signal areas. Urder normal operating conditions
the control should be turned iully clockwise. When stronę
cverloading or disturted signais are received rotate this
control cojnterclcckwise to reduce gain.
Note: The Squelch Control 15) may require readjustment
with reduced RF Gain control.
10 Microphone Gain
A pre3mpli:icr circuit is built into this unit to increase
microphone gain. E periment with this control for the
selling that will best suit your individual use.
11 Channe! Selector
Has 40 detents in a turn and selects une of the channels
desired. Use the Channel solector in conjunction with the
Band Select switch. The selected 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 modecanonly
be communicoled 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 back cover to page 11 for information
of channel provision and frequencies.
15 Squelch
This control is used te eut off or eliminato receiver back-
ground noise in the absence of an incoming signal. For
ma imum receiver sensitivity it is desired that the control
be adjusted only to the point where the receiver back-
ground noise or ambient background noise is eliminated.
Turn fully counterclockwise then slowly clockwise until
the receiver noise just disappears. Any signal to be received
must now be slightly stronger than the average received
noise. Further clockwise rotation will increase the threshold
level which a signal rnusl overcome in order to be heard.
Only strong signais will be heard et a ma imum clockwise
setting.
16 AF Gain
Permits you to adjust the listening level when receiving.
17 VFO
Opérâtes on both TX and RX modes (±5kHz), allowing
you to use the inter-channel space. Especially use fui in SSB.
18 Phone Jack
Accepts a plug from a headset of 4 to 32 Ohm impédance.
Insertion of the plug will silence the built in speaker (and
e ternal speaker connected to E ternal Speaker jack).
19 Function Indicators
LEO indicators located in the LED area permit you to
know instantly the mode to which the unit is engaged.
On Air: Lights up during transmit mode indicaîing you are
on-ths-air.
CWFM AM-USB-LSB: Indicates a corresponding mode
selecteri by the Mode selector 12).
20 Channel Readout
This is the LED (light emitting diode] digital readout to
indicëte the channel selected by the Channel selector.
21 Power/SWR Meter
Used for two purpose * to indicete 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 signal 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-Talk Microphone
The receiver and transmitter are controlled by the Push-to-
Talk switch on ne microphone. Press the switch and the
transmitter is activated; release the switch to receive. When
transmitting. hold the microphone two inches fron the
mnuth and soeak clearly in a normal voice. The radio cornes
complète with the low impédance dynamie microphone
(stpplied). Note: Depressing the PuslHo-Talk. switch
on the microphone is also required to activate the PA
system.
- 4 -

Rear Pane!
Rear Panel Connectors
1 Antenna Receptacle A/B
Accept PL-259 type coa ial plugs trom antenna system.
Switching to connect the transceiver output to einer
receptacle is done with the Antenna A -В switch on the
front panel.
2 PA Speaker Jack
Used for public address operation. The PA.speaker should
be connected to this jack using 1/8" (3.6mm) diąmeter
plug. Insertiorv of an e ternal speaker into the E ternal
Speaker jack will not Interrupt the PA operation.
3 E ternal Speaker Jack
Used to connect en e ternal speaker for e tra Sound source.
Use 1/8" (3.6mrr) diąmeter plug for connection. Insertion
of the plug into this jack will silence the internai speaker.
4 • CW Key
Use for morse code operation. Connect a CW kôy to this
jack and place the CW/FM/AM/USB/LSB switch in the CW
position.-
5 Sélective Call Jack
A provision has been made which enables your transceiver
to couple with a sélective call set (available from your
dealer).’ This jack is used to ccnnect the sélective call sèt
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 jack. Following the dealer's advise and
instruction manuał accompanying the purchased sélective
call set will ensure proper sélective call installation and
operation;
6 Fuse
Accomodates a fuse for AC input circuit protection. Use
125V 2A or 250V 1A fuse for replacement.
Note. Before replacing the fuse, see your dealer to chpck
to find out the reason why the fuse was blow. Replacing
without check may only blow the fuse again.
7 AC Power Cord
Connects to AC power outlet for AC mains supply.
8 Frequency Counter Output Jack
The RCA-type (pin) jack 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.
9 Recording Output Jack
The RCA-type (pin) jack provides output for connection
to a tape recorder to permit recording of received signais or
your modulating voice.
“ 5—

IMPORTANT: Маке sure that the antenna, power source,
and microphone are connected before you operat).
1} Set t'ne CB-РА switch to CB position.
2) Turn the unit on by setting the Power Switch to On
position. Npw the meters, Channel Indicator, and Function
Indicators will be illuminated.
3) Temporarily. set the Mode Switch in AM position.
4) Set the Squelch Control in fully counterclockwise
position and ajust the AF Gain control for a comfortable
listening level.
5) Listen to the background noise from the speaker. Turn
the Squelch Control slowly clockwise until the noise just
disappears (no signal should be present). Leave the Squelch
Control at this setting. The Squelch Control is now pro-
perly adjusted. The receiver will remain quiet until a singal
is actualy received. Do not advance the Squelch Control
too far clockwise or some of the weaker signais will not be
heard.
6) Depress the Clarifier and set it to the center (12 o'clock)
position.
7) Seloct a desi.red mode of operation, CW, FM, AM, USB
or LSBand adjust the Clarifier.
8) Select a channel you desire by the Band Select switch,
then by the Channel Selector.
Note. If you want to operate in between charnels, pull
out the clarifier knob and rotate it upscale or downscale.
(This also affects in transmitting mode.)
Operating Procedure То Transmit
1) Select the desired channel and mode of transmission.
2) If the channel is elear, depress the Push-to-Talk switch
on the microphone. Speak in a normal tone of voice.
Standby-Beep
A special provision has been bullt in you radio to give other
stations a sign which tells that you are turning to receive.
Without needing switching operation toactivatetiisfeature,
a been tone is automatically transmitted at each time you
release the push-to-talk switch on the microphone to turn
to receive mode.
Microphone gain control
A preamplifi8r circuit is built into the radio to increase the
microphone gain. E periment with the control for setting
that will best suit your individual use.
Note. When the microphone gain control is set to
ma imum, ambient noise may also be picked 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.
Qperating Proced re To Receive
To use this feature oi th8 transceiver, a speaker having a
voice coil impédance ôf 8 to 16 ohms and a power handling
capability of at least »3 watts should be connected ta the
PA SP jack on the real; panel. Be sure that there is physical
séparation between the microphone and the PA speaker
itself. If the PA speaker is located vsry close to the micro
phone, acoustic feedback will resuit when the PA amplifier
is operated at high völume (or when PA is used indoors),
Adjustment of PA volume is made with the MIC GAIN
control. •V
SWR Measurement
Most antennas are factory tuned, but the antenna efficiency
may be peaked by slightly adjusiing 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 transcsiver.
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-Talk switch on the microphone and
turn the Calibrate Control clockwise (past dick) so that the
SWR meter pointer e actly coincidos with the Set mark
on the scale. Release the Push-to-Talk switch.
4) Set the SWR-Cal switch to the SWR position and depress
the Push-to-Talk 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 broadeast into
the air.
P blic Address Operation
- 6 -

Section 4 Maintenance & Adj stment
Circuit Theory
The concept of PLL system frequency synthesization is not
of recent development, however, it lias ndt been a long aga
sinco the digital theory lias been coupléd with the PLL
synthesization technology. Although details of the PLL
theory is somewhat curnplicated 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-locked
loop wliich is fundamentary composed of a closed loop
feedback circuit. The feedback component is the balance of
frequency drifts and the PLL circuit acts to cancel it eut.
То detect oui the frequency drift of thé PLL output, a
fi ed reference oscillator ПО kHz, 1/1024 divided down
from 10.740 MHz) is compared constantly with the input
frequency (10 kHz). The input frequency is obtained by
dividing the VCO frequency. A functional block diagram
is provided below under 'PLL Circuit' for theeasier under*
standing.
Off-Set frequency oscillator TR-29 The off-set-frequency
oscillator TR-29 oscillâtes at 14.460 MHz for ail band
Switching befween these oscillating frequencies is made by
biasing the diodes O 97 to D111.
The off-set frequency signal is obtained at TR-29 emitter
and flcws through L*16 and C-88 into TR-25 mi er where
it is beat with the VCO signal. The VCO signal is obtained
from the following:
f vco 3 f off-set+ N fr
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.
TRANSMUTER
IC * tR<.S/b6 TRt4 TR 1.3
TX HIXtR ~|— loRvtR s)— fÔRiytR F H POWER
sse иco
1 ^ 0 = 14.460 + 91 X 0.01 = 15.370 MHz
Since the mi er output is determined by two factors-the
off- set frequency output (dependent on band selector
switch) and the VCO output, the mi er 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 programmable divider in IC-1 down to 10
KHz which is compared with another 10 KHz signal ob
tained from the reference oscillator (10.240 MHz).
The VCO output is mi ed with the eff-set frequency signal
and applied to the TX mi er IC-9 through band-pass filters
L-43 and L-44. i.e. At channel 1 in band A, and AM band,
the TX mi er IC-9 accepts 15.370 +10.695 MHz = 26.065
MHz is TX frequency. The mised with 10.695 MHz signal
from Tr-30. Wheri leceiving channel I in band A (26.U65
MHz), the Ist RX mi er TR-18 accepts 15.370 local signal
at its base, and converts down it to 10.695 MHz IF (for
AM/FM modes, this is the Ist intermediatc frequency).
TR-18 off-sets the 10.695 MHz signal so that TR-30 сап
oscillâtes at 10.6975 MHz for LSB.
P U C lB L U i l
trjs
MIXER
TR 29 TM6
IS. 37-17.41«*
DUT
TR77
OSE i— 10F- IV 460«* 1 VCO I 1 BUffER
0 91-3 IS W ,
L- j — n r n r - j ------ f еш-H R I— ( prog ram oiv
ïPHASE SET Ы 02t OIV
TR2* IC S
10.2I.HH« — 101— 1 ose h
_REÇEIVER
P L I
CIRCUIT
lOJbHH«
IS.37
17Л1
«*
1069S TR JO
HHi Н 0И ose I
,ru XF I r —
TRi? TftieJ ___ 1х'*£П TRI» 1В20/2Ш2 IRlH 1
ant — |Rf лир Щ hixfr Ft-yHu/tfo— fssa if 1— [ssa ir (— (proo cct(
JB3L iL w m , TR,2/IC0 SP
FM ОСТ 1 ----------- 1 AM 1 F l ------ 1A*1 onl------------------
T l TR9ŻO/II TR23
- 7

Alignaient Proced re
1 - Measurement Condition
(1) Reference température _______________ 25° C
(2) Référencé humidity__________________65%
Note: Unlcss otherwise spesified, olignment may bc perfor-
med under the room température of 5e- 35° C and the
room humidity of 45 - 80%.
3) Power supply _______________ ЛС 110s/ or 220V ±3%
2 - Test Equipment. ЛИ test oquipment 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 kHz to 60 MHz.
d) Synchroschope, 0-100 MHz. high input Z.
e) FM déviation meter.
f) Digital voltmeter
g) 8 Onms 5W résistive speaker load.
h) Two audio signal gonorators. 10 Hz to 20 kHz, atténu
ative.
i) RF wattmeter, 50 chm/15 watt, thermocoupled.
j) Circuit lester, input impédance 20 kOhm/V.
k) Regulated DC power supp y, more than 4A.
l) Dummy microphone plugs, receive and transmit mode.
m) YIVM . U.l mV rreasurable.
3 - PLL Circuit AÜgnment
A [10.24 MHz| Refererce Frequency Adjustment
[Check)
1) Connect ferquency counter to pn terminal be-
tween C-78 end C-79.
2) Check counter reods 10.24000 MHz-.
3) Tolérance within ±200 Hz is acceptable. Other
wise, replace X I (10.24 MHz).
B. 110.695/10.6825/10.6075 MHz] Adjustment.
1 ) Connect frequency counter to TP-6.
2) 10.695 MHz: Sot the mode selector to CW. Adjust
L-26to 10.695 M Hz+ 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 Sebctor 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 and R-107).
3) Adjust L-16 for ma imum RF output.
D. IVCO] Adjustment
1) Set the mode selector to AM, and the clarifier
control to center, and set the bsnd selector to
position F with CH 40.
2) Connect synchroscope to TP-3.
3) Adjust L-18 for ma imum RF output.
4) Connect DC voltmeter to TP-2 (pin terminal
between the R-109 and R-258 from IC-5).
5) Adjust L-17 to DC 5.0+ 0.1 V.
6) Check A bond of CH7, must be DC l .5V minimum.
E. [Off -set Frequency] Adjustment
1) Connect frequency counter to TP-3 (pin terminal
of L-18).
2) Set the Mode Selector to AM, and the Clarifier
Control to center.
3) Set the Band Selector to position C of CH19.
4) Adjust L-19 for 16.040 MHz =50 Hz.
5) Set the modo 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 transmitte
station.
10) Adjust VR-15 for 16.0375 MHz -50 Hz.
4.- Transmitter Alignaient
A. Test set-up
Connect testing unit to the unit asshown:
«uira/u* ou)
- 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) AdjustVR11to 10 ± 0.5 mA.
4) Connect current meter to TP-9 (+) and TP-7 (-).
5) AdjustVR 10 to 1Û0±5mA.
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 CH4Û.
4) Adjust VR-12 and L-42 for ma imum RF output.
5) Adjust L-40, L-43, L-44 and L-33 for ma imum
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 CHI with RF output.
D. Two-Tone Adjustment
1) Apply 500 Hz and 2,400 Hz (30 mV) audio tones
to the microphone input circuit at the same lime.
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 like '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 unit.
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 mit.
4) Adjust VR-5 to obtain 2-3 K Hz.
H . . RF power Meter Adjustment
1 ) Set the Mode Selector to AM.
2) Comparing the reading ef e ternal RF power and
the built-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
e t S.P jack, and connect a key sw to key sw Jack.
3) Key sw on and adjust VR-16 to 200 ± 10 mV.
Reference -SS B Two-Tone Alignment
A. Properly adjusted transmitter.
Important: RV-12 (bias)
Adjustment: RV-12 should
not be rotated clockwise
beyond 2 o'clock position,
or the RF power transistor
will be destroyed.
C. E cessive modulation • Adjust
RV12 counterclockwise.
E. Undermodulation-Adjust RV 12
clockwise.
B. Unequal tones-Adjust çenerator
Outputs to balance.
F. Similar to A but showing hum-
Check for proper testing condi
tion.

5.- Receiver Alignment
A. Test set-up
Connect testing equipment to the unit as shown:
АС Power 3%
B. 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, L10. LU , and L12
for ma imum audio output From speaker output
terminais (across dummy load).
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 1-13 and L-14 for ma imum audio output.
Set clarifier to center.
D. FM IF/Demodulator Alignment (FM Sensitivity
Adjustment)
1 ) Select channel 19 in Band C. set the Mode Selector
to FM.
2) Set signal-generator to 27.185 MHz.
3) Apply FM signal (1 i«V, 1.5 KHz déviation with 1
KHz audio) to unit.
4) Readjust L-5 for ma imum audio output.
E. Squelch Adjustment
1 ) Set the Mode Selector to AM.
2) Set signal generat'or to provide RF input signal of
60 dB (1000 >*V). 1 KHz 30% modulated, and
rotate squelch control to the fully clockwise
position.
3) Connect scope to speaker output terminal. Adjust
VR-4 to a point at which audio output is critically
disappeared on scope.
Check the Squelch circuit will opeate within 48-70
dB at ali modes. SSB RX squelch is autdmatically
adjust by VR-3 and requires no particular adjust
ment.
F. S-Meter Adjustment
1 ) Set the Mode Selector to AM.
2) Adjust signal gererator output to 40 dB (100 cV).
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 blaker 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 fV).
3) The NB/ANL SW ON.
4) Connet DC voltmeter to TP-1.
5) Adjust L-1 and L-2 to obtain DC 2-3V.
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EPT360010Z Main Board
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Schematic Diagram
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