Codan Radio Communications VT-3-150-SN User Manual
4-2
Audio Processor Board Instruction Manual
4.4
Subtone Input Setup
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Apply a 100 Hz tone at -18 dBm to the subtone 1 input .
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Adjust R42 (SUBTONE INPUT 1) to produce:
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±500 Hz(Wideband) or ±350 Hz(Narrowband) deviation.
•
Remove the signal.
4.5
Balanced Input Frequency Response
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Apply a 1 kHz tone at –18 dBm to the BALANCED INPUT (Transmitter Main
Board edge connector pins B18, Z18).
Board edge connector pins B18, Z18).
•
Record deviation and use this level as the 0 dB reference.
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Sweep frequency from 100 Hz to 5 kHz.
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The audio response should be within +/- 1dB from 300 Hz to 2500 Hz.