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User's Guide

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Squelch Setting Options
The transceiver’s squelch facility is configured from the AM-Voice, or AM-MSK Settings screen. The
following fields are applicable to squelch operation.
Sql Defeat. The squelch defeat facility can be set to on or off.
❑ When set to on, the squelch facility does not operate.
❑ When set to off the transceiver’s squelch facilities are available.
Squelch. The squelch field sets the threshold; the default setting is -107 dBm.
❑ During periods of no reception, or when signals weaker than the threshold are
received, the transceiver is muted.
❑ When signals stronger than the squelch threshold are received, the squelch circuits
are defeated and reception is heard in the normal way.
Sql N/Comp. This field allows noise compensated squelch to be selected on or off. When this facility
is on, the squelch circuits mute all signals weaker than the threshold, and also mute
signals stronger than the threshold that are excessively noisy.
Sql Carr O/R. The carrier override squelch facility is used in conjunction with the noise compensated
squelch facility. If too many noisy signals are being lost due to noise compensation,
carrier override can be switched on to reduce the squelch threshold by 10 dB. The
default threshold of -107 dBm effectively becomes -97 dBm with carrier override
switched on. All signals stronger than -97 dBm, irrespective of the noise level, are then
heard in the normal way.
Using the RF Pre-Attenuator
Selecting the RF pre-attenuator to On provides a 6 dB reduced sensitivity feature to improve co-location
performance where maximum sensitivity cannot be realised due to large unwanted signals
Table 7 Squelch Facility Settings
Required Squelch Operation Squelch Defeat
Setting
Squelch Setting Sql N/Comp
Setting
Sql Carr O/R
Setting
No squelch On Any Off Off
Squelch
(without noise compensation)
Off Required threshold Off Off
Noise compensated squelch Off Required threshold On Off
Noise compensated squelch
with carrier override squelch
Off Required threshold On On