Adjusting The Pa Gain - Codan NGT 2010 RF Technical & Service Manual

Adjusting the PA gain

Drawing
(sheet
ALTERNATIVE TEXT
Drawing
Drawing
NOTE
NOTE
To adjust the PA gain:
1
1
1
1
NGT Transceiver System Technical Service Manual
08-05261 (sheet 1)
1), or
08-05869 (sheet 2), or
08-06461 (sheet 2)
If the PCB issue status is -06 or earlier, see drawing
The transceiver must be in Service mode to perform this check (see
page 154, Accessing Service
Select any test channel frequency between 4 and 6 MHz (for example, test
channel 16).
Connect an oscilloscope to the Tx test point (exciter output) on the RF/IF PCB in the
RF unit (use connector J2 body as earth) (see
page 161).
Using a single-tone audio (1 kHz), adjust the audio input level until the exciter
output level is 225 mV p–p.
Adjust the PA GAIN control (R205) on the PA PCB to give a 45 W output (see
Figure 30 on page 161
or 08-05889 (sheet 1)
mode).
Figure 28 on page 160
or Figure 31 on page 162
NGT—Checks and adjustments
and drawing 08-05415
08-05889 (sheet
or
or Figure 32 on page
or 08-05511
1).
Figure 29 on
162).
189