[App_rpt-users] squelch tail

[Stephen Rodgers]

Scott Weis wrote:
> I've been listening on the LA hub and noticed that the systems on there 
> don't have a squelch tail after each receive. I have always had one no mater 
> what radio I've used. My current config is as follows: 1 pair of Icom F221 
> radios (Full duplex), 1 URI and on Dell PC running ACID (Updated to latest 
> ACID asterisk release.) The COR is hardware from the radio. PL is DSP. What 
> is everyone else doing different?
> 
> Thanks & 73
> Scott KB2EAR 
> 
> 
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Hi Scott,

There could be a couple of things that could cause this:

1. COR always asserted from the radio, and carrier detect depending on
CTCSS decode only. Check for signal swing on the COR line with a
voltmeter or a scope and make sure it swings below 0.3V and above 3V for
signal and no signal conditions.


2. There have been reports that when external COR is used with internal
DSP CTCSS decode, that the system doesn't respond as quickly as when DSP
is used for both CTCSS and squelch, or when an external decoder is used
for both CTCSS and the radio's squelch circuit is used. None of this is
confirmed so if you could confirm it, that would be useful.

As a test, try using external COR and CTCSS or a combined signal and see
if that  eliminates the squelch tail.

Steve
WA6ZFT