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<p>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,,,<br>
</p>
<br>
<div class="moz-cite-prefix">On 2/15/2018 6:46 PM, Tim Sawyer wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAG3ht9vbCqRESrditDkkPXy8eGDYqqrtWN5hxeyvD8ZM99PpbA@mail.gmail.com">
<div dir="ltr">
<div class="gmail_default" style="font-size:large">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. </div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Feb 15, 2018 at 10:50 AM, Jeff
Carrier <span dir="ltr"><<a
href="mailto:k0jsc.jeff@gmail.com" target="_blank"
moz-do-not-send="true">k0jsc.jeff@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>Here's a down and dirty display of overlap with
transmitter power, feed line loss, antenna gain, pattern
and azimuth figured in.</div>
<div><br>
</div>
<img src="cid:part2.914504C3.4A10E28F@leikhim.com"
alt="Inline image 1" style="margin-right:25px" class=""><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Message: 8<br>
Date: Wed, 14 Feb 2018 17:33:50 -0800<br>
From: Tim Sawyer <<a
href="mailto:tisawyer@gmail.com" target="_blank"
moz-do-not-send="true">tisawyer@gmail.com</a>><br>
To: Users of Asterisk app_rpt <<a
href="mailto:app_rpt-users@lists.allstarlink.org"
target="_blank" moz-do-not-send="true">app_rpt-users@lists.allstarli<wbr>nk.org</a>><br>
Subject: Re: [App_rpt-users] Simulcast buffer value
issue<br>
Message-ID:<br>
<<a
href="mailto:CAG3ht9t7Unky%2BTc0MFTOLg2Z3%2BpcnoWFM2AyNFKeFcrOeE4cdw@mail.gmail.com"
target="_blank" moz-do-not-send="true">CAG3ht9t7Unky+Tc0MFTOLg2Z3+pc<wbr>noWFM2AyNFKeFcrOeE4cdw@mail.gm<wbr>ail.com</a>><br>
Content-Type: text/plain; charset="utf-8"
<div>
<div class="h5"><br>
<br>
11,000 feet! No way that will simulcast well,
not at 70 miles.<br>
<br>
On Tue, Feb 13, 2018 at 8:10 PM, Jeff Carrier
<<a href="mailto:k0jsc.jeff@gmail.com"
target="_blank" moz-do-not-send="true">k0jsc.jeff@gmail.com</a>>
wrote:<br>
<br>
> I really hope to be able to confirm this
soon. I've been lazy and our 3<br>
> sites are 86 miles, 79 miles and 70 miles
(in a triangle). One of the 3 is<br>
> over 11,000 feet elevation. No matter what
we've tried so far you still<br>
> hear distortion in the overlap area(s) even
when 1 site is 20 miles out LoS<br>
> and the other is around 60 miles out non
LoS. Everything is linked on a<br>
> private uW network with very low latency
and basically zero packet loss.<br>
> The transmitters (GE MIII) run about 1hz
freq error with the gpsdo attached.<br>
><br>
> Sometimes I just wonder if this is just
multi-path from the various<br>
> granite reflectors we have on the front
range of Colorado (one of them is<br>
> Pikes Peak)<br>
><br>
> de K0JSC<br>
><br>
> ------------------------------<br>
>><br>
>> Message: 6<br>
>> Date: Tue, 13 Feb 2018 20:43:42 +1100<br>
>> From: Hayden Honeywood <<a
href="mailto:haydenph91@gmail.com"
target="_blank" moz-do-not-send="true">haydenph91@gmail.com</a>><br>
>> To: <a
href="mailto:app_rpt-users@lists.allstarlink.org"
target="_blank" moz-do-not-send="true">app_rpt-users@lists.allstarlin<wbr>k.org</a><br>
>> Subject: [App_rpt-users] Simulcast
buffer value issue<br>
>> Message-ID:<br>
>> <CAC0VLD0-9mc=<a
href="mailto:T8BkvMwx6PqWXqtUXCYY2odbjc2ajjDiVLKSBg@mail.gm"
target="_blank" moz-do-not-send="true">T8BkvMwx6PqWXqt<wbr>UXCYY2odbjc2ajjDiVLKSBg@mail.<wbr>gm</a><br>
>> <a href="http://ail.com"
rel="noreferrer" target="_blank"
moz-do-not-send="true">ail.com</a>><br>
>> Content-Type: text/plain;
charset="utf-8"<br>
>><br>
>> Interesting thoughts Tim... perhaps
worth documenting on the wiki?<br>
>> Even though it was just "in theory",
what kind of sync error was it?<br>
>> Were we talking microseconds or even
more?<br>
>><br>
>> I have a receiver on a yagi pointed at
a distant simulcasted site. I<br>
>> have noticed on occasion, I can hear
the distant simulcasted site<br>
>> start to send audio underneath the
carrier of the site that is closest<br>
>> (and strongest to me). The distant site
is also the master site, and<br>
>> has the lowest latency, but I'm talking
two words worth of audio is<br>
>> send before my other site starts
sending audio. Once they are both<br>
>> transmitting, I have not noticed any
timing issues (i.e. distortion<br>
>> etc). I'm not sure if this issue was
related to what I posted<br>
>> previously about the variable audio
delay on unkey.<br>
>><br>
>> I'm running app_rpt on a Raspberry Pi
using a cut down image we use here<br>
>> in VK.<br>
>><br>
>> <a href="http://vklink.com.au"
rel="noreferrer" target="_blank"
moz-do-not-send="true">http://vklink.com.au</a><br>
>><br>
>><br>
>> "When simulcasting the audio from all
(non captured) transmitters needs to<br>
>> arrive at the receiver with in an
acceptable time frame (80 us). The DAC<br>
>> theory was that it didn't start sending
audio at correct clock cycle every<br>
>> time. That would cause the audio to be
out of sync between RTCMs causing<br>
>> simulcast distortion.<br>
>><br>
>> As I said, that was the theory. The new
theory is that the external clock<br>
>> source was causing the DAC to trigger
inappropriately. I spoke with<br>
>> someone<br>
>> I met here on the list (Kevin I think
its was) who is using a different<br>
>> external clock and reports perfect
simulcast operations"<br>
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--<br>
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-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div>Tim WD6AWP<br>
</div>
</div>
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<pre wrap="">_______________________________________________
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<br>
<pre class="moz-signature" cols="72">--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
<a class="moz-txt-link-abbreviated" href="mailto:JLeikhim@Leikhim.com">JLeikhim@Leikhim.com</a>
407-982-0446
<a class="moz-txt-link-abbreviated" href="http://WWW.LEIKHIM.COM">WWW.LEIKHIM.COM</a></pre>
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