Using The Conventional Squelch Operation Features; Analog Options; Digital Options - Motorola ASTRO APX 4000 Series Quick Reference Card

Note: If a call arrives while the radio is in the clock-setting
menu, the radio exits clock setting and displays the call
information. Any changes made before the call is NOT
saved.
Using the Conventional Squelch Operation
Features
This feature filters out unwanted calls with low signal strength or
channels that have a higher than normal background noise.

Analog Options

Tone Private Line (PL), Digital Private-Line (DPL), and carrier
squelch can be available (preprogrammed) per channel.
Mode
Carrier squelch (C)
PL or DPL
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English
Result
You hear all traffic on a channel.
The radio responds only to your
messages.

Digital Options

One or more of the following options may be preprogrammed in
your radio. Check with your dealer or system administrator for
more information.
Option
Digital Carrier-Operated
You hear any digital traffic.
Squelch (COS)
You hear any digital traffic having
Normal Squelch
the correct network access code.
You hear any digital traffic having
Selective Switch the correct network access code
and correct talkgroup.
Result