<div dir="auto">It did. I saw it. <div dir="auto"><br></div><div dir="auto">You know, it would seem to me that timing really isn't the issue as much as the xmtr frequency being exact at all three sites. Although, on FM, the frequency is modulated at the same rate in the overlap areas, so I can see where timing is critical, but unless all 3 xmtrs are synched to the same frequency, it's still gonna sound like a jumbled mess...</div><div dir="auto"><br></div><div dir="auto">The answer isn't simple, but it looks like you're either going to have to reduce transmit power output or incorporate low-gain directional antennas for the transmitters.</div><div dir="auto"><br></div><div dir="auto">Lower gain transmit antennas a few (hundred?) feet down from the RX antennas?</div><div dir="auto"><br></div><div dir="auto">Just tossing some thoughts out there.</div><div dir="auto"><br></div><div dir="auto">Good Luck, Jeff.</div><div dir="auto"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Feb 15, 2018 12:53 PM, "Jeff Carrier" <<a href="mailto:k0jsc.jeff@gmail.com">k0jsc.jeff@gmail.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">...I'm not sure that mailman passed the image. If you're interested I can send it off list.</div><div class="elided-text"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 15, 2018 at 11:50 AM, Jeff Carrier <span dir="ltr"><<a href="mailto:k0jsc.jeff@gmail.com" target="_blank">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:ii_1619acc92dd7bf53" alt="Inline image 1" style="margin-right:25px"><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">tisawyer@gmail.com</a>><br>
To: Users of Asterisk app_rpt <<a href="mailto:app_rpt-users@lists.allstarlink.org" target="_blank">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">CAG3ht9t7Unky+Tc0MFTOLg2Z3+pc<wbr>noWFM2AyNFKeFcrOeE4cdw@mail.gm<wbr>ail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<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">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">haydenph91@gmail.com</a>><br>
>> To: <a href="mailto:app_rpt-users@lists.allstarlink.org" target="_blank">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">T8BkvMwx6PqWXqt<wbr>UXCYY2odbjc2ajjDiVLKSBg@mail.g<wbr>m</a><br>
>> <a href="http://ail.com" rel="noreferrer" target="_blank">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">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>
>> -------------- next part --------------<br>
>> An HTML attachment was scrubbed...<br>
>> URL: <<a href="http://lists.allstarlink.org/pipermail/app_rpt-users/attach" rel="noreferrer" target="_blank">http://lists.allstarlink.org/<wbr>pipermail/app_rpt-users/attach</a><br>
>> ments/20180213/991fdf0c/attach<wbr>ment-0001.html><br>
>><br>
>> ------------------------------<br>
>><br>
>> Subject: Digest Footer<br>
>><br>
>> ______________________________<wbr>_________________<br>
>> App_rpt-users mailing list<br>
>> <a href="mailto:App_rpt-users@lists.allstarlink.org" target="_blank">App_rpt-users@lists.allstarlin<wbr>k.org</a><br>
>> <a href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="noreferrer" target="_blank">http://lists.allstarlink.org/c<wbr>gi-bin/mailman/listinfo/app_rp<wbr>t-users</a><br>
>><br>
>><br>
>> ------------------------------<br>
>><br>
>> End of App_rpt-users Digest, Vol 108, Issue 12<br>
>> ******************************<wbr>****************<br>
>><br>
><br>
><br>
> ______________________________<wbr>_________________<br>
> App_rpt-users mailing list<br>
> <a href="mailto:App_rpt-users@lists.allstarlink.org" target="_blank">App_rpt-users@lists.allstarlin<wbr>k.org</a><br>
> <a href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="noreferrer" target="_blank">http://lists.allstarlink.org/c<wbr>gi-bin/mailman/listinfo/app_rp<wbr>t-users</a><br>
><br>
> To unsubscribe from this list please visit <a href="http://lists.allstarlink.org/" rel="noreferrer" target="_blank">http://lists.allstarlink.org/</a><br>
> cgi-bin/mailman/listinfo/app_r<wbr>pt-users and scroll down to the bottom of<br>
> the page. Enter your email address and press the "Unsubscribe or edit<br>
> options button"<br>
> You do not need a password to unsubscribe, you can do it via email<br>
> confirmation. If you have trouble unsubscribing, please send a message to<br>
> the list detailing the problem.<br>
><br>
<br>
<br>
<br>
--<br>
Tim WD6AWP<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://lists.allstarlink.org/pipermail/app_rpt-users/attachments/20180214/3bcc2d18/attachment-0001.html" rel="noreferrer" target="_blank">http://lists.allstarlink.org/<wbr>pipermail/app_rpt-users/attach<wbr>ments/20180214/3bcc2d18/attach<wbr>ment-0001.html</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
______________________________<wbr>_________________<br>
App_rpt-users mailing list<br>
<a href="mailto:App_rpt-users@lists.allstarlink.org" target="_blank">App_rpt-users@lists.allstarlin<wbr>k.org</a><br>
<a href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="noreferrer" target="_blank">http://lists.allstarlink.org/c<wbr>gi-bin/mailman/listinfo/app_rp<wbr>t-users</a><br>
<br>
<br>
------------------------------<br>
<br>
End of App_rpt-users Digest, Vol 108, Issue 14<br>
******************************<wbr>****************<br>
</blockquote></div><br></div></div>
</blockquote></div><br></div>
</div><br>______________________________<wbr>_________________<br>
App_rpt-users mailing list<br>
<a href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.<wbr>allstarlink.org</a><br>
<a href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="noreferrer" target="_blank">http://lists.allstarlink.org/<wbr>cgi-bin/mailman/listinfo/app_<wbr>rpt-users</a><br>
<br>
To unsubscribe from this list please visit <a href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="noreferrer" target="_blank">http://lists.allstarlink.org/<wbr>cgi-bin/mailman/listinfo/app_<wbr>rpt-users</a> and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"<br>
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. <br></blockquote></div><br></div>