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2. Set the channel select switch at a programmed channel.
•In the receive mode, adjust L211 for the programmed receiving frequency minus 16.9MHz.
•In the transmit mode, adjust L212 for the programmed transmitting frequency.
•Then check again, because these adjustments interact.
3. Confirmation
Check each frequency:
All frequencies should be within ±500Hz.
7 - 5 - 2 TRANSMISSION
A.
Power Adjustment
1. Connection of measuring instruments and setting of the knobs.
•Connect ANT to 50 ohm power meter.
•Connect a voltmeter and variable power supply to the set.
CAUTION: Applying over 12V can damage the P.A. transistor.
•Set the channel select switch at a programmed channel.
2. Procedure
•Adjust L219 through L222 and C285, C286, C290 and C291 for maximum power output while
pushing PTT switch.
• If the total current drain exceeds 1000mA, adjust C291 to set the current at 1 OOOmA, and
repeat above procedures.
3.
Confirmation
More than 2.5W output, less than 1 OOOmA current drain.
No abnormality in operation should be found if the supply voltage is varied from 7.0V to 10.BV.
B.
Modulation Adjustment
Power
Supply
(7~11vl
RF
wattmeter
1. Connecting the measuring instrument and the settings of the controls.
Connect a deviation meter to the ANT Connector with a directional coupler or attenuator.
Deviation meter filter shall be a High Pass Filter 50Hz, L.P.F. 20KHz. De-emphasis OFF.
•Set the channel select switch at a programmed channel.
•Connect an AF oscillator, with AF millivoltmeter in parallel, to the mic input.
2. Procedure
Mic input shall be 1KHz 120mV RMS.
During transmit, adjust R171 on the main unit for
4.5KHz deviation.
7-7
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