User's Guide

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