<html><head><meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type" /></head><body dir="ltr" bgcolor="#ffffff" text="#000000">The RTCM has a manual squelch threshold pot. It will function as a bilevel squelch with a strong signal.<br>
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Are you feeding the discriminator audio to the RTCM and have it set up as such?<br>
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If you cannot use discriminator audio you may need an audio delay board in place as well. This is not a standard configuration if you're feeding non discriminator audio to the RTCM.<br>
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<br><br><div class="gmail_quote">On March 29, 2015 10:01:54 AM EDT, "R. Wayne" <allstar@controlservers.net> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<div>But as we said we are using a RTCM.</div>
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<div> </div>
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<div style="font-color: black"><b>From:</b> <a title="jrorke@cogeco.ca" href="mailto:jrorke@cogeco.ca">REDBUTTON_CTRL</a> </div>
<div><b>Sent:</b> Sunday, March 29, 2015 5:09 AM</div>
<div><b>To:</b> <a title="app_rpt-users@ohnosec.org" href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a> </div>
<div><b>Subject:</b> Re: [App_rpt-users] Squelch Tail
Elimination</div></div></div>
<div> </div></div>
<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">The
short answer is yes.<br /><br />What you need to do is bring out raw discriminator
to the URI or USB fob. Then configure youfr node for USB radio to have
<br /><br />Carrierfrom = dsp and ctcss from = dsp.<br />you also need to set the rx
demod to flat.<br /><br /><br />[usbnode_num]<br /><br />hdwtype=0
<br />rxboost=1<br />txboost=1<br />rxctcssrelax=1<br />txctcssdefault=131.8
; default pl tone<br />rxctcssfreqs=131.8 ;rx pl
tone<br />txctcssfreqs=131.8 ;tx pl tone if
used<br />;rxctcssoverride=0<br />carrierfrom=dsp ;carrier squelch
detection<br />ctcssfrom=dsp ; pl tone
detection<br />rxdemod=flat<br />txprelim=yes<br />txlimonly=no<br />txtoctype=phase<br />txmixa=voice<br />txmixb=no<br />invertptt=0<br />duplex=0<br />rxondelay=0<br />rxnoisefiltype=0<br />eeprom=0<br /><br /><br />Save
your settings and restart your Allstar node so the changes take affect.<br />Do
your audio calibrations.<br /><br />Then you will need to set the carrier squelch.
Typically the default squelch setting in Allstar is below the threshold. So you
will get squelch crashes.<br /><br />Do a "radio tune rxsquelch" at the cli with no
signal at the receiver. It will return the current squelch setting and the
current squelch level.<br /><br />*CLI> radio tune rxsquelch<br />Current Signal
Strength is 788<br />Current Squelch setting is 500<br /><br />If the squelch level is
below the signal strength then the carrier squelch is open.<br />Set the squelch
higher than the signal strength by about 80-100 points.<br /><br />*CLI> radio
tune rxsquelch 820 <enter><br /><br />Try the squelch. It should give you a
"fast squelch" for signals that have 20 db quieting or better.<br />then test the
threshold and see how weak signal will open the squelch. You may have to tweak
the squelch to liking.<br /><br />Once you have the squelch set correctly then save
thew settings.<br /><br />*CLI> radio tune save.<br /><br />You should be good to
go.<br /><br />Jon VA3RQ<br /><br /><br /><br /><br /><br /><br /><br /><br />On 3/29/2015 1:33 AM, R.
Wayne wrote:
<blockquote cite="mid:1C25F83802714DAD9562D2F02199D5FB@delllaptop" type="cite">
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<div>After relocating our MSF 5000 to a new location and adjusting the squelch
as low as we could reliably go we noticed that we have a squelch tail. Our
coordination requires that we don’t. It appears that the MSF has a fixed
squelch tail elimination method an no control other than cranking up the
squelch again. This is surprising since we use PL encode / decode. I would
think that the PL would mute as soon as the user unkeys.</div>
<div> </div>
<div>With this said is there anything in Allstar that would help with this
situation?</div>
<div> </div>
<div>Wayne</div></div></div><br />
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