Squelch Features; Receive Squelch Mode; Pl/Dpl Squelch Codes - Motorola GM300 Series Selling Manual

Squelch Features

6.2.2 Channel Free Beep
If a transmission attempt fails due to Transmit Admit Criteria not being satisfied, a Channel Free
Beep is sounded as soon as the criteria are satisfied.
Benefits
User is advised as soon as they are permitted to transmit; particularly useful on a busy


channel.
Message can be sent as soon as possible.


Don't have to waste time re-trying to transmit.


7.0 Squelch Features
7.1

Receive Squelch Mode

Squelch settings are used to keep the radio's loudspeaker turned off unless the required type of
signal is detected. The default squelch mode of the radio when it is first turned on can be set as any
of the following:
Open Squelch (Hear all background noise)


Carrier Squelch (Only open squelch if Carrier is detected)


PL/DPL Squelch (Only open squelch if the correct PL/DPL is received)


Tone Squelch (Only open if the correct 5 tone signal is received)


Tone & PL/DPL (Only open if correct 5 tone and PL/DPL are received)


7.2

PL/DPL Squelch Codes

PL/DPL squelch can be explained to customers as a way to stop them hearing communications
between other users on the same channel who are not in their group (on the same PL/DPL). It
allows several groups within an organisation to share the same channel.
PL codes are often used to access community repeaters.
Each channel can be programmed with separate encode and decode PL/DPL codes.
PL codes can be set between 65 and 255Hz, in 0.1Hz steps.
DPL has 103 codes between 023 and 754.
7.2.1 PL Squelch
PL squelch can be:
Standard: squelch requirements are satisfied when its PL is present
Reverse: squelch requirements are satisfied when its PL is not present
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