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P/M1225 Squelch Settings

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Mar 31, 2019
Operating some 1225's inside a large concrete building. What is the difference between AND/STD and AND/OR, Local and Distance, and which are the best to use in that environment? Getting some static after letting off the key.


Lots and lots of watts
Dec 5, 2008
Sonoma, CA
Rules for unmuting/muting:

AND = requires both carrier and PL/DPL before radio unmutes
OR = Either loss of carrier OR loss of PL/DPL will mute radio
STD = requires PL reverse burst or DPL turn off code to mute (will eventually mute with loss of carrier).

OR mute is better at reducing squelch bursts at the end of transmissions however it may false at lower receive signals.

Local/Distant just reduces the receive sensitivity a little bit. Could also help on squelch bursts depending on the source
but will reduce your range.
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