Sq Key; Fig. 3.9 Squelch Behavior - R&S 4200 Series Operating Manual

Local Control (Local Mode)
3.4.2.6

SQ Key

Function
Squelch behavior
SQ key on + RSSI AND/OR (S+N)/N over SQ
threshold
SQ key on + RSSI AND/OR (S+N)/N below SQ
threshold
SQ key off + RSSI AND/OR (S+N)/N over SQ
threshold
SQ key off + RSSI AND/OR (S+N)/N below SQ
threshold
By using the SQ key, you can open or close noise suppression (squelch) at
any time independently of the current menu. The only precondition is the
local mode.
The switch-on and switch-off behavior of noise suppression (squelch) and
the opening and closing of the squelch relay at the output of the radio
depend on the RSSI squelch threshold and the S/N squelch threshold. The
thresholds can be configured using the Service and Maintenance Tool
R&S ZS 4200 (see chapter 3.3 Configuring with the R&S ZS 4200).
The following table shows the states on the radio as a function of the
thresholds.
Fig. 3.9 Squelch behavior.
Analog
Audio SQ relay
muted (X10.8/X10.9)
by radio
No
Yes
No
No
3.29
R&S XU 4200
VoIP Audio
muted by
radio
Close No
Open Yes
Close No
Open Yes
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