R&S 4200 Series - SQ Key; Fig. 3.9 Squelch Behavior

Local Control (Local Mode) R&S XU 4200
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3.4.2.6 SQ Key
Function
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.
Squelch behavior
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 follo
wing table shows the
states on the radio as a function of the
thresholds.
Analog
Audio
muted
by radio
SQ relay
(X10.8/X10.9)
VoIP Audio
muted by
radio
SQ key on + RSSI AND/OR (S+N)/N over SQ
threshold
No Close No
SQ key on + RSSI AND/OR (S+N)/N below SQ
threshold
Yes Open Yes
SQ key off + RSSI AND/OR (S+N)/N over SQ
threshold
No Close No
SQ key off + RSSI AND/OR (S+N)/N below SQ
threshold
No Open Yes
Fig. 3.9 Squelch behavior.