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SNV-12 Operations Manual
3-83
10.
Using a tone box, generate a 1kHz tone into the console‟s microphone, at a level that
will produce a 100% modulation. (Some consoles produce a test tone that can be used
during alignment) The 1kHz tone is used to simulate average voice (Test Tone).
11.
Continue to generate the test tone and set the console‟s output pot to the appropriate
system level (normally -10dBm) for the connection medium linking the console to the
voter.
12.
Continue to generate the test tone and adjust the CIM Console TX Audio Input pot
(R50) so that the Norm LED just lights. Verify this adjustment by connecting a
transmission test set between CIM test point 3 (TP3) and ground. Verify a level of
approximately 0dBM for the CIM-1 and CIM-2 modules.
13.
Continue to generate the test tone at the console and adjust R50 on the CIM module in
Expansion Chassis 1 until 0dBm is measured between TP3 and ground.
14.
If there is only one Expansion Chassis, skip to Step 15. Otherwise adjust R50 on the
CIM module of Expansion Chassis 2 until 0dBm is measured between TP3 and ground.
15.
Now adjust the transmit levels for all system SVMs connected to transmitters through
the SVM terminal block pins 5&4. Connect a transmission test set to TP1 and ground
on the SVM under test. Adjust the SVM transmit level pot (R62) to the appropriate
system level for average voice (typically -10dBm).
When using EIA keying tones to key a transmitter, the function tone and the average
voice levels are the same levels out of the voter. R62 adjusts the EIA tone/voice audio
combination. Remember that the High Guard Tone is 10dB above the function tone
and average voice levels. Be sure there is enough headroom to support this level.
16.
Now repeat steps 1-4 for the remaining receiver sites. Each SVM can be set to the
identical TP3 level at each SVM.
17.
Disconnect all test equipment and remove modules from extender cards.
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