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High power—Fault finding and adjustments
240
NGT Transceiver System Technical Service Manual
Adjusting the bar graph meter
To adjust the bar graph meter:
1
Ensure the NGT is connected to the power amplifier and switched on.
1
Adjust preset potentiometer R257 to give a voltage of 1.40 V DC at TP214.
Adjusting the amplifier output power
To adjust the amplifier output power:
1
Connect setup as per
1
Select any channel below 10 MHz.
1
Set the output power preset potentiometer R218 on the Control PCB fully
counterclockwise.
1
Hold down
PTT, then turn the output power preset potentiometer until the required
).
1
Release PTT.
NOTE
The transceiver does not have to be in Service mode to perform this
adjustment.
NOTE
The transceiver does not have to be in Service mode to perform this
adjustment.
Table 17: Power output PEP vs measuring instrument (500 W/1 kW)
Power Output PEP
500 W
1 kW
Peak reading meter
500 W
1 kW
RMS reading meter
250 W
500 W
Average reading meter (e.g.
Bird Model 43)
202.5 W
405 W
Oscilloscope
447 V p–p
632 V p–p
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