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