Adj ust the DELAY control V R 2 for su itable release
time.
4. CW S I DETON E LEV E L ADJUSTM E NT
CW sidetone level may be adj usted by rotating TONE
level potentiometer ( VR4 ) located on
PB- 1 3 1 5A.
5.
CA R R I E R BALAN CE
T h e transceiver shou ld b e al lowed t o reach operating
temperatu re before making the carrier balance adj ust
ment.
Tune-up the transceiver for SSB operation using an
antenna or dummy load. T u rn the M IC GAIN control
fully counterclockwise to remove all audio from the
modulator stage.
With the MODE switch set to either the LSB/USB
positions, tum the "FUNCTION SWITCH" to the
MOX position and adjust the carrier balance
controls (VR l and TC l ) on PB- l 1 84A for mini
mum PO meter reading.
A more exacting balance may be obtained by tuning
a receiver. hav ing an S-meter. to the transmitted fre
quency. Adj ust the balance controls for minimum S-meter
read ing while sw itching the MODE sw itch back and
forth between the two sideband positions to obtain
good carrier su ppression for both sidebands.
6. A LC LEVEL ADJUSTMENT (EE/EX m o d e l )
The ALC meter will require adjustment if when the
METER switch on the front panel is set to the ALC
position , the mode switch to USB , the "FUNC
TION SWITCH" to MOX and the microphone gain
to zero the ALC meter does not read 5. To adjust
the meter, set the controls as follows :
MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . U SB
MIC GAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fully CCW
MOX-PTT-VOX . . . . . . . . . . . . . . . . . . . . . . . . . . . MOX
If the meter reads other than .5 on the bottom scale.
adj ust the A LC control VR2 on
PB- 1 1 84A
for a meter
ind ication of
. 5 .
Return the " MOX- PTT-VOX " switch
to the PTT position.
For the E model, please re fer to the following RF
processor adjustment.
7 .
R F PROCESSOR
Set the controls and switches as follows :
MODE
SSB (either LSB or USB)
HEATER
OFF
METER
ALC
PROCESS OFF
MIC GAIN Fully CCW position
BAND
Any Band
Set the operation switch to MOX posltlon and
adjust a potentiometer VR2 until the meter
indicates exactly full scale without any modula
tion.
Connect the 1 kHz audio signal generator output
of 10 mV to the MIC input. Adjust the MIC GAIN
control until the audio input voltage becomes
3 0 mV at the gate of
Q l ,
2 S K 1 9GR. Peak
Tl
and
T3 for maximum audio output at the output coil
of T3. Set the V R l for 30 mV output at T3.
Set the RF PROCES SOR switch to ON position
and peak T2 for a maximum output.
8. VO LTAG E R EG U LATO R A DJ U STM E N T
Connect a VTVM D C probe betw een pin 1 3 o f MJ
6
( PB- 1 54 7 )
and ground. A dj u st VOLT potentiometer
VR2
for exactly
6
Volt reading on VTVM.
9. C LA R I F I E R A DJUSTM E NT
The frequencies coincide at CLARIFIER control OFF and
0 position in the receive mode. I f not, adjust potentio
meter
VR3
located near the clarifier control potentio
meter under the main chassis.
Transmit and receiver frequencies coincide at
C L A R I F I E R
control O F F position. I f not. adjust
Z E R O
potentiom eter
VR3 on PB- 1 5 4 7 .
1 0. B I AS A DJUSTM E N T
The final amplifier bias must be checked to insure
linearity and normal operating plate d issi pation for the
final tubes. Adj u st the BIAS control
V R l on PB- 1 547
as fol lows : Set t h e transceiver t o th e receive mode
and allow the transceiver to reach operating tem pera
tu re.
Set
MODE
s
wi
tc
h
to USB. M ETER
sw itch to IC and
the "FUNCTION SWITCH" to MOX position for
transmit condition. The meter will indicate PA
plate current . Idle plate current is 60 mA if the bias
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