[App_rpt-users] Simulcast buffer value issue
Joe Leikhim
rhyolite at leikhim.com
Fri Feb 16 01:21:45 UTC 2018
Wow; that is going to be rough. In the commercial worl, we would not
attempt that. Better to move the Southeast site close in between the
North and Southwest sites and do a ribbon system. Even then,,,
On 2/15/2018 6:46 PM, Tim Sawyer wrote:
> There's a better plot that can be done for simulcast with Radio Mobile
> that even has a input parameter for acceptable delay. Use about 80
> microseconds. The default resulting plot is mostly solid black which
> hides the map. You have to tweak the colors and/or transparency. I'll
> see if I can find one of my old plots... that was a couple of
> computers ago.
>
> On Thu, Feb 15, 2018 at 10:50 AM, Jeff Carrier <k0jsc.jeff at gmail.com
> <mailto:k0jsc.jeff at gmail.com>> wrote:
>
> Here's a down and dirty display of overlap with transmitter power,
> feed line loss, antenna gain, pattern and azimuth figured in.
>
> Inline image 1
>
>
> Message: 8
> Date: Wed, 14 Feb 2018 17:33:50 -0800
> From: Tim Sawyer <tisawyer at gmail.com <mailto:tisawyer at gmail.com>>
> To: Users of Asterisk app_rpt
> <app_rpt-users at lists.allstarlink.org
> <mailto:app_rpt-users at lists.allstarlink.org>>
> Subject: Re: [App_rpt-users] Simulcast buffer value issue
> Message-ID:
>
> <CAG3ht9t7Unky+Tc0MFTOLg2Z3+pcnoWFM2AyNFKeFcrOeE4cdw at mail.gmail.com
> <mailto:CAG3ht9t7Unky%2BTc0MFTOLg2Z3%2BpcnoWFM2AyNFKeFcrOeE4cdw at mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
>
>
> 11,000 feet! No way that will simulcast well, not at 70 miles.
>
> On Tue, Feb 13, 2018 at 8:10 PM, Jeff Carrier
> <k0jsc.jeff at gmail.com <mailto:k0jsc.jeff at gmail.com>> wrote:
>
> > I really hope to be able to confirm this soon. I've been
> lazy and our 3
> > sites are 86 miles, 79 miles and 70 miles (in a triangle).
> One of the 3 is
> > over 11,000 feet elevation. No matter what we've tried so
> far you still
> > hear distortion in the overlap area(s) even when 1 site is
> 20 miles out LoS
> > and the other is around 60 miles out non LoS. Everything is
> linked on a
> > private uW network with very low latency and basically zero
> packet loss.
> > The transmitters (GE MIII) run about 1hz freq error with the
> gpsdo attached.
> >
> > Sometimes I just wonder if this is just multi-path from the
> various
> > granite reflectors we have on the front range of Colorado
> (one of them is
> > Pikes Peak)
> >
> > de K0JSC
> >
> > ------------------------------
> >>
> >> Message: 6
> >> Date: Tue, 13 Feb 2018 20:43:42 +1100
> >> From: Hayden Honeywood <haydenph91 at gmail.com
> <mailto:haydenph91 at gmail.com>>
> >> To: app_rpt-users at lists.allstarlink.org
> <mailto:app_rpt-users at lists.allstarlink.org>
> >> Subject: [App_rpt-users] Simulcast buffer value issue
> >> Message-ID:
> >>
> <CAC0VLD0-9mc=T8BkvMwx6PqWXqtUXCYY2odbjc2ajjDiVLKSBg at mail.gm
> <mailto:T8BkvMwx6PqWXqtUXCYY2odbjc2ajjDiVLKSBg at mail.gm>
> >> ail.com <http://ail.com>>
> >> Content-Type: text/plain; charset="utf-8"
> >>
> >> Interesting thoughts Tim... perhaps worth documenting on
> the wiki?
> >> Even though it was just "in theory", what kind of sync
> error was it?
> >> Were we talking microseconds or even more?
> >>
> >> I have a receiver on a yagi pointed at a distant
> simulcasted site. I
> >> have noticed on occasion, I can hear the distant
> simulcasted site
> >> start to send audio underneath the carrier of the site that
> is closest
> >> (and strongest to me). The distant site is also the master
> site, and
> >> has the lowest latency, but I'm talking two words worth of
> audio is
> >> send before my other site starts sending audio. Once they
> are both
> >> transmitting, I have not noticed any timing issues (i.e.
> distortion
> >> etc). I'm not sure if this issue was related to what I posted
> >> previously about the variable audio delay on unkey.
> >>
> >> I'm running app_rpt on a Raspberry Pi using a cut down
> image we use here
> >> in VK.
> >>
> >> http://vklink.com.au
> >>
> >>
> >> "When simulcasting the audio from all (non captured)
> transmitters needs to
> >> arrive at the receiver with in an acceptable time frame (80
> us). The DAC
> >> theory was that it didn't start sending audio at correct
> clock cycle every
> >> time. That would cause the audio to be out of sync between
> RTCMs causing
> >> simulcast distortion.
> >>
> >> As I said, that was the theory. The new theory is that the
> external clock
> >> source was causing the DAC to trigger inappropriately. I
> spoke with
> >> someone
> >> I met here on the list (Kevin I think its was) who is using
> a different
> >> external clock and reports perfect simulcast operations"
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> Tim WD6AWP
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> --
> Tim WD6AWP
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--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim at Leikhim.com
407-982-0446
WWW.LEIKHIM.COM
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