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OCUBIC
COMMUNICATIONS
S.,II",
DIVISION
uency counter,
AC voltmeter or oscilloscope and RF generator from the unit.
ALC AND METER AWUS'IMENTS
Connect the microphone
to the MIC/KEY
jack on the front panel of the
unit.
Connect the RF wattmeter and 50 ohm dummy load to the ANTENNA connec-
tion on the rear apron.
Set the MODE
switch
to CW and adjustPTO A for a
display frequency of 14500.0 kHz.
Connect the IC oscilloscope probe
to the "high"
potential leg of the
REFL trimpot (RIO?)
on the preselector board.
Key the unit with the micro-
phone button and adjust the MIC GAIN control for 100 watts of output. Quick-
ly adjust the
SWR NULL trimmer capacitor (Cla3)
on the SWR/wattmeter board
for minimum IC voltage on the oscilloscope
«
0.5 V DC).
-
NOTE: During·this and subsequent CW tests, limit the "key down" time
to 30 seconds or less to prevent overheating and resultant dam-
age to the power amplifier devices.
Allow time
between trans-
missions to permit them to cool.
Disconnect the oscilloscope
probe.
Set the
METER
switch
to the FWD
position.
Key the unit, and adjust the MIC GAIN for 100 watts of output and
quickly adjust the
FWD trimpot (R14?) on the distribution board for a read-
ing of 100 on the unit's meter.
Set the MIC GAIN control fully clockwise, key the unit, and quickly ad-
just the FWD ALC trimpot (RI04) on the preselector board for 110 watts
of output.
Disconnect the 50 ohm dummy load
and reconnect
the
100
watt (la ohm
cold) light bulb
in its place.
With the
MIC GAIN control fully clockwise,
key the unit and quickly adjust the REFL ALC trimpot (RIO?) on the preselec-
tor board for 50-60 watts of output.
Set the METER switch to REFL,
key the
unit, and quickly adjust the
REFL
trimpot (Rl49) on the distribution board
for a reading of 100 on the unit's meter. (10 watts reflected power)
Check the output
on all bands
for
40
to ?O watts
of output using the
light bulb as aload.
Disconnect
the light bulb load and reconnect
the 50 ohm
dummy load.
Check the power output
forlOO-120 watts
on all bands,
with the
MIC GAIN
control fully clockwise.
Disconnect the coax lead at the ANTENNA connector of the unit.
Key the
unit with the
MIC GAIN control fully clockwise and note that the total cur-
rent drawn from the power supply
is less than 12 amperes on all bands.
Re-
connect the coax lead to the ANTENNA connector.
NOTE: It rnay be necessary to slightly readjust the
FWD
and
REFL ALe
trimpots and
SWR NULL
trimmer capacitor to obtain the proper
indications on all bands.
Set the BAND switch to 20 meters,
the
METER switch to ALC and the MIC
GAIN control fully
counterclockwise.
Key the unit
and adjust the ALC ZERO
trimpot (RlIO) on the preselector board for a reading of
S 2 on the
units
meter.
Adjust the
~IC
GAIN
control to
its fully clockwise position.
The
meter reading should increase to +20 or greater.
Unkey the unit.
8-11,
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Troubleshooting
