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Testing and Adjustments
05#
Turn on transmit carrier
356#
Select External TX Audio path
10#
Unmute TX Audio path
58#
Turn on compandor
TX SAT Deviation Test
Communications Analyzer Setup:
HP 8920 Screen: TX
Pass Specifications: 1.8 kHz - 2.2 kHz
Test Mode Commands:
11333#
Load synthesizer to channel 333
122#
Set power level to power step 2
05#
Turn on transmit carrier
251#
Enable 6000 Hz SAT tone
View AC Freq for the reading. The tran-
sponded peak SAT FM deviation should be
2 kHz +
200 Hz.
TX ST Deviation Test
Communications Analyzer Setup:
HP 8920 Screen: TX
Pass Specifications: 9.9 kHz - 10.001 kHz
Test Mode Commands:
11333#
Load synthesizer to channel 333
122#
Set power level to power step 2
05#
Turn on transmit carrier
14#
Enable signaling tone
View AC Freq for the reading. The peak ST
FM deviation should be 8 kHz + 800 Hz.
TX DSAT Deviation Test
Communications Analyzer Setup:
HP 8920 Screen: TX
Pass Specifications: .630 kHz -.770 kHz
Test Mode Commands:
571#
Enable NAMPS signalling
11333#
Load synthesizer to channel 333.
NCHAN prompt will be
displayed.
1
To select center frequency
(0-Low, 1-Center, 2-High)
122#
Set power level to power step 2
05#
Turn on transmit carrier
253#
Enable DSAT code 25AD4D
View FM Deviation for the reading.
Adjustment Sequence
To properly check and adjust the phasing
parameters using keypad commands,
perform the following procedures in
sequence.
IMPORTANT
Only those memory locations referred to
in the following procedure should be
programmed. Data in other memory
locations which are “Stepped through”
during the procedure
must not be
altered.