[App_rpt-users] RTCM squelch tail elimination?

[David McGough]

Hi Sam,

I forwarded your reply to the list. Yes, I agree that obtaining 
discriminator (flat) audio one way or another and then using software 
squelch is the best solution.

73, David KB4FXC


On Sun, 20 Apr 2014, Sam Skolfield wrote:

> FYI as a proud owner of a voted VHF repeater based on the RTCMS, they have
> excellent squelch action, and most of the time you can't even hear the
> slightest bit of a squelch tail at all! Perhaps there is a way to eliminate
> the squelch gating and de-emphasis in your DHE voter? This way you could
> feed voted discriminator audio into the RTCM to take advantage of it's
> onboard squelch circuit...
> Just thinking out loud.
> 
> 
> On Sun, Apr 20, 2014 at 10:01 PM, David McGough <kb4fxc at inttek.net> wrote:
> 
> >
> > Tim,
> >
> > app_rpt can't do STE on receive since that is a transmitter function. But,
> > chan_usbradio does provide a means to chop off the squelch tail using an
> > audio delay. This is exactly how it's done on most stand-alone
> > analog controllers these days.
> >
> > See the parameter: rxsquelchdelay in the usbradio.conf file.
> >
> > I can confirm this does work, I use it on several Kenwood repeaters.
> > Note that you must use flat audio (rxdemod=flat) for rxsquelchdelay to
> > work, since the "flat" setting turns on most of the DSP code. Setting
> > rxsquelchdelay=150 will solve most squelch crash issues, in my
> > experience.
> >
> > 73, David KB4FXC
> >
> >
> >
> > On Sun, 20 Apr 2014, Tim Sawyer wrote:
> >
> > > Simpleusb has nothing to do with RTCMs. You should not have a
> > simpleusb.conf on your system if your only interface is a RTCM.
> > >
> > > When you have set the RTCM COR type = 1 the squelch tail comes from
> > your radio, or rather the Doug Hall voter in your case. As far as I know
> > there is no STE setting anywhere in app_rpt or any of it’s channel
> > drivers including chan_voter.
> > >
> > > Have you considered connecting RTCMs to your receivers and let them
> > vote in place of the Doug Hall?
> > >
> > > --
> > > Tim
> > > :wq
> > >
> > > On Apr 20, 2014, at 12:53 PM, Sam Nabkey <sam.nabkey at gmail.com> wrote:
> > >
> > > >
> > > > Hello all...
> > > >
> > > > I have replaced a repeater controller with a RTCM and a  server.
> > > >
> > > > All is well but for a heavy squelch tail after carrier drop.  I am
> > using the unit in simple mode because  I do not have an active
> > discriminator output because I am using the RTCM behind a Doug Hall voter.
> > > >
> > > > I have Googled the subject to death and I see plenty of mentioned
> > items regarding simpleusb and usb settings but nothing on voter
> > configuration.   Am I missing something someplace?
> > > >
> > > > Thanks in advance for all the information.
> > > >
> > > > You all are some of the smartest folks I know.
> > > >
> > > > Sam K8SN
> > > >
> > > >
> > > >
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