M3SR Series 4100 Selecting the Squelch Type
3.208 Operating Manual 6175.4760.02 – 01
3.9.4.5 Selecting the Squelch Type
Softkey Softkey Type Description
Listbox 1. Press 'Squelch' softkey.
2. Select desired mode from listbox.
3. Press 'ENT' key to confirm.
Possible values:
OFF, RSSI, Signal, Syllabic, RSSI & Syllabic,
RSSI & Signal
Default value:
OFF
The squelch is particulary effective for F3E, at
good reception conditions even for other
modes but A1A, B8E and B7D, where squelch
would not allow reasonable reception, it is not
selectable there.
RSSI (Received Signal Strength Indication)
The RSSI squelch opens only if the squelch
threshold is exceeded (see RSSI Squelch
Threshold).
Signal squelch
The signal squelch acts upon a variable sub-
tone. Only if the wanted signal contains this
subtone, which is always transmitted with it,
will the audio signal be unmuted. If signal
squelch is selected, a subtone is also added to
the transmitted signal. The subtones within a
network should be set to identical values.
The signal squelch is supported in modulation
modes F3E, H3E and A3E, but not in single
sideband modulations due to their sideband fil-
ters.
Syllabic squelch
The syllabic squelch enables the audio output
when syllabic-like signals are detected in the
reception signal. This squelch method is less
fading-sensitive than RSSI squelch.
The syllabic squelch is supported in modula-
tion modes A3E, H3E and J3E.
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