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NGT—Checks and adjustments
NGT Transceiver System Technical Service Manual
181
1
Release PTT.
1
Check that the two-tone waveform is clean and undistorted.
If it is not clean and undistorted, further analysis is required.
To adjust the high output power:
1
Select any channel frequency between 4 and 6 MHz.
1
Connect an average or PEP power meter with a 50
Ω
dummy load to the RF
connector ( ).
1
Connect an oscilloscope via a 47 k
Ω
resistor to the antenna connector.
1
Set the oscilloscope timebase to 500
µ
s per division and the trigger to auto.
1
Connect a signal generator to provide two-tone audio (700 Hz and 2300 Hz) via the
test unit to:
•
the audio input on the 15-way GPIO connector on the junction box or 2012 RF
Unit (see
•
the 2011 RF Unit via the NGT test handset (see
)
1
Hold down
PTT, then adjust the two-tone level for compression.
1
Adjust the Y sensitivity of the oscilloscope for on-screen display and adjust the
trigger for a stationary waveform.
1
Adjust the two-tone balance control for good crossover display.
1
Adjust HI PWR (R32) (see
Table 48: Power output PEP vs measuring instrument (12/100/125 W)
Power Output PEP
12 W
100 W
125 W
Peak reading meter
12 W
100 W
125 W
RMS reading meter
6 W
50 W
62.5 W
Average reading meter (e.g.
Bird Model 43)
5 W
40.5 W
50.6 W
Oscilloscope
69 V p–p
200 V p–p
224 V p–p
ALTERNATIVE TEXT
Drawing
NOTE
If the PCB issue status is -04 or earlier, see drawing
NOTE
The transceiver does not have to be in Service mode to make this
adjustment.
NOTE
The output power is factory-set, so it is not likely to be outside the
specified limits. Check that there are no faults with the transmitter circuits
before attempting to adjust the output power.
Содержание NGT 2010 RF
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