[App_rpt-users] Squelch Tail Elimination

[R. Wayne]

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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