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~~M~!~ATIONB
SMlAItI
DIVISIDN
PrO RANGE AND mSPLAY OPERATION
Set the PTO MODE switch to PTO A, turn the PrO A knob counter clockwise
to its limit.
The display frequency should be
between 13940.0 and 13880.0.
Turn"the PTO A knob clockwise to its stop,
and the display frequency should
be between 14560.0 and 14620.0.
Set the
BAND
switch to 10D.
The display
frequency should be stable.
Set the BAND switch to 20.
Set the PTO MODE switch to PTO Band repeat the range checks for PTO
B.
Set the BAND switch to lOB, and adjust PrO B for a display frequency of
28888.8 and check that
the segments and decimal point
are properly lighted
on the display.
mSPLAY FRmUENCY ACCURACY
Connect a frequency
counter to the "T" coupling and attenuator in the
antenna line.
Disconnect
the microphone,
and
connect an audio generator
to the
EXT MOD jack on the rear apron
of the unit.
Connect an SPST switch
to the KEY jack on the rear apron.
Adjust
the audio generator's
output to 1000 Hz
±
10 Hz.
Key the unit
with the SPST
switch and adjust
the MIC GAIN
control and audio generator
output level for approximately 20 watts output, or until the frequency coun-
ter has a stable count.
Check the following:
That the carrier (output)
frequency equals the display frequency minus
1.0 kHz in the LSB mode,
±
0.4 kHz.
That the carrier (output)
frequency equals the display frequency
plus
1.0 kHz in ,the USB mode,
±
0.4 kHz.
That the carrier (output)
frequency equals the display frequency
plus
0.8 kHz in the CW and CWN modes,
±
0.4 kHz.
TRANSMITTER OPERATION
Disconnect the frequency counter from the "T" connector in the antenna
line and connect the oscilloscope in its place.
Keep the
attenuator in the
line to protect the osci11oscope input circuitry.
Disconnect the audio gen-
erator from the EXT MüD jack and connect the
two-tone generator to the EXT
MOD jack.
Check the power output
andthe total drain current on all bands in the
CW mode, with the MIC GAIN control fully clockwise, and with the output freq-
uency adjusted to the high end of each band.
The power output should be 100
to 120
watts on all bands and the total current drain from the power supply
should be 18 amps or less
at 100 watts output.
Power
output
should vary
from less than 5 watts
to full power as the MIC GAIN control is varied from
fully counterclockwise to fully clockwise.
There should be no output
until
the unit is keyed with the SPST switch.
Check the meter accuracy in the FWD position at 100 watts output on the
20 meter band.
Accuracy should be
±
10%.
Disconnect the coax at the ANTEN-
NA connector on the rear apron,
and set the METER
switch to
REFL,
the MIC
GAIN fully clockwise,
and key the unit momentarily.
The panel meter should
indicate in the red area.
Reconnect the coax to the ANTENNA
connecto~.
Set
the meter switch
to ALC,
key the unit,
and vary the MIC GAIN control from
fully counterclockwise to fully
clockwise.
The
meter reading
should vary
from approximately 0 to +20 or higher.
Unkey the unit, and the meter should
read approximately 0 in any of the METER switch positions.
8-3
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Troubleshooting
