Codan NGT 2010 RF Technical & Service Manual page 554

High power—Fault finding and adjustments
Adjusting the bar graph meter
Drawing
NOTE
To adjust the bar graph meter:
1
1
Adjusting the amplifier output power
Drawing
NOTE
To adjust the amplifier output power:
1
1
1
1
Table 17: Power output PEP vs measuring instrument (500 W/1 kW)
Power Output PEP
Peak reading meter
RMS reading meter
Average reading meter (e.g.
Bird Model 43)
Oscilloscope
1
240
08-05979 (sheet 1)
The transceiver does not have to be in Service mode to perform this
adjustment.
Ensure the NGT is connected to the power amplifier and switched on.
Adjust preset potentiometer R257 to give a voltage of 1.40 V DC at TP214.
08-05979 (sheet 1)
The transceiver does not have to be in Service mode to perform this
adjustment.
Connect setup as per page 180, Adjusting high output
Select any channel below 10 MHz.
Set the output power preset potentiometer R218 on the Control PCB fully
counterclockwise.
Hold down PTT, then turn the output power preset potentiometer until the required
output power is reached (see
Release PTT.
and 08-05979 (sheet 2)
and 08-05979 (sheet 2)
Table 17).
500 W
500 W
250 W
202.5 W
447 V p–p
NGT Transceiver System Technical Service Manual
power.
1 kW
1 kW
500 W
405 W
632 V p–p