User's Manual

GMH Series VHF Radio Maintenance
BK RADIO Page 5-13
The GMH is designed to turn the audio on at approximately a 12 dB SINAD level and off at
about a 6 dB level. If components in the IF filter or squelch filter are replaced, adjustment of
the squelch levels may be necessary. The "Discriminator Audio Level", "Receiver Front End
Tuning", and "Second Local Oscillator Frequency" adjustments must be correct before
performing the Squelch adjustment.
The channel noise is filtered by the squelch filter and applied to the SQUELCH AID converter
input of the microprocessor Ii (system board). The noise signal is processed digitally according
to values stored in non-volatile memory.