[App_rpt-users] Squelch Tail Elimination

[Bryan Fields]

The RTCM has a manual squelch threshold pot.  It will function as a bilevel squelch with a strong signal.

Are you feeding the discriminator audio to the RTCM and have it set up as such?

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.



On March 29, 2015 10:01:54 AM EDT, "R. Wayne" <allstar at controlservers.net> wrote:
>But as we said we are using a RTCM.
>
>From: REDBUTTON_CTRL 
>Sent: Sunday, March 29, 2015 5:09 AM
>To: app_rpt-users at ohnosec.org 
>Subject: Re: [App_rpt-users] Squelch Tail Elimination
>
>The short answer is yes.
>
>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 
>
>Carrierfrom = dsp and ctcss from = dsp.
>you also need to set the rx demod to flat.
>
>
>[usbnode_num]
>
>hdwtype=0    
>rxboost=1
>txboost=1
>rxctcssrelax=1
>txctcssdefault=131.8    ; default pl tone
>rxctcssfreqs=131.8    ;rx pl tone
>txctcssfreqs=131.8    ;tx pl tone if used
>;rxctcssoverride=0
>carrierfrom=dsp    ;carrier squelch detection
>ctcssfrom=dsp    ; pl tone detection
>rxdemod=flat
>txprelim=yes
>txlimonly=no
>txtoctype=phase
>txmixa=voice
>txmixb=no
>invertptt=0
>duplex=0
>rxondelay=0
>rxnoisefiltype=0
>eeprom=0
>
>
>Save your settings and restart your Allstar node so the changes take
>affect.
>Do your audio calibrations.
>
>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.
>
>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.
>
>*CLI> radio tune rxsquelch
>Current Signal Strength is 788
>Current Squelch setting is 500
>
>If the squelch level is below the signal strength then the carrier
>squelch is open.
>Set the squelch higher than the signal strength by about 80-100 points.
>
>*CLI> radio tune rxsquelch 820 <enter>
>
>Try the squelch. It should give you a "fast squelch" for signals that
>have 20 db quieting or better.
>then test the threshold and see how weak signal will open the squelch.
>You may have to tweak the squelch to liking.
>
>Once you have the squelch set correctly then save thew settings.
>
>*CLI> radio tune save.
>
>You should be good to go.
>
>Jon VA3RQ
>
>
>
>
>
>
>
>
>On 3/29/2015 1:33 AM, R. Wayne wrote: 
>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.
>
>With this said is there anything in Allstar that would help with this
>situation?
>
>  Wayne
>
>   
>
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--
Bryan Fields
727-409-1194
http://bryanfields.net
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