<div dir="ltr"><div>Jeff,<br></div>Yes it is getting its 10 MHz reference from a GPSDO, the BG7TBL unit to be exact.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 7, 2017 at 9:32 PM, 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">Joe, <div><br></div><div>Did you lock it to a GPSDO? Jim mentioned this mod to me about a year ago and I never had a chance to give it a try. My previous overlap area was tolerable but I've added a third transmitter so it may be time to try this finally.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 7, 2017 at 10:00 AM, <span dir="ltr"><<a href="mailto:app_rpt-users-request@lists.allstarlink.org" target="_blank">app_rpt-users-request@lists.<wbr>allstarlink.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send App_rpt-users mailing list submissions to<br>
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Today's Topics:<br>
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1. RTCM Simulcast and 9.6 MHz Phase locking (Joe Moskalski)<br>
2. Re: RTCM Simulcast and 9.6 MHz Phase locking (Joe Leikhim)<br>
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------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Sun, 7 May 2017 03:13:26 -0400<br>
From: Joe Moskalski <<a href="mailto:kc2irv@gmail.com" target="_blank">kc2irv@gmail.com</a>><br>
To: app_rpt mailing list <<a href="mailto:App_rpt-users@ohnosec.org" target="_blank">App_rpt-users@ohnosec.org</a>><br>
Subject: [App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking<br>
Message-ID:<br>
<<a href="mailto:CAES28qyXLtJMUoGqAYk5bKU_eE2Nciq_9QQC48rBDSeZigtgHA@mail.gmail.com" target="_blank">CAES28qyXLtJMUoGqAYk5bKU_eE2N<wbr>ciq_9QQC48rBDSeZigtgHA@mail.<wbr>gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
I wanted to throw this email out to the group for all those who want to<br>
simulcast with the RTCM. For those who don't know, in order to make the<br>
RTCM suitable for simulcast you must have a more accurate 9.6 MHz clock for<br>
the RTCM in order to ensure the audio sounds acceptable in the overlap<br>
areas. I did this a few months ago using 9.6 MHz OCXO's. This worked<br>
reasonably well. Not as well as I would have liked but the system was very<br>
usable, but of course I wanted it to be better. Since the PCGM<br>
(Programmable Clock Generation Module) is no longer available, I decided to<br>
roll my own as some say.<br>
I created a PLL circuit that can accept a 10 MHz, 1 MHz or 100 KHz<br>
reference input and produce a phase locked 9.6 MHz out for the RTCM. I have<br>
been testing this over the past few days and it has made an great<br>
improvement in the audio quality in the overlap. The quality of the audio<br>
in the overlap areas sounds very, very good, it's very similar to what I<br>
expect to hear in commercial simulcast systems. My circuit is heavily based<br>
off of an old Motorola MSF5000 HSO PLL circuit that I was able to adapt and<br>
modify to my needs. There are other uses for this circuit that make it<br>
attractive for simulcasting but I wont get into them here. I am will to<br>
share my schematic and bill of materials (digikey) with anyone. Please send<br>
me an email and I will be willing to share all of my information on the<br>
project.<br>
<br>
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Message: 2<br>
Date: Sun, 7 May 2017 03:42:25 -0400<br>
From: Joe Leikhim <<a href="mailto:rhyolite@leikhim.com" target="_blank">rhyolite@leikhim.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] RTCM Simulcast and 9.6 MHz Phase locking<br>
Message-ID: <<a href="mailto:35ee60f8-a760-363b-0d28-1b6c9967cebd@leikhim.com" target="_blank">35ee60f8-a760-363b-0d28-1b6c9<wbr>967cebd@leikhim.com</a>><br>
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<br>
Thanks Joe;<br>
<br>
I would certainly be interested in your documentation. Does this solve<br>
the problem of transmit PL tone jumping phase on key up, as Hayden<br>
encountered?<br>
<br>
Joe L<br>
<br>
On 5/7/2017 3:13 AM, Joe Moskalski wrote:<br>
> I wanted to throw this email out to the group for all those who want<br>
> to simulcast with the RTCM. For those who don't know, in order to make<br>
> the RTCM suitable for simulcast you must have a more accurate 9.6 MHz<br>
> clock for the RTCM in order to ensure the audio sounds acceptable in<br>
> the overlap areas. I did this a few months ago using 9.6 MHz OCXO's.<br>
> This worked reasonably well. Not as well as I would have liked but the<br>
> system was very usable, but of course I wanted it to be better. Since<br>
> the PCGM (Programmable Clock Generation Module) is no longer<br>
> available, I decided to roll my own as some say.<br>
> I created a PLL circuit that can accept a 10 MHz, 1 MHz or 100 KHz<br>
> reference input and produce a phase locked 9.6 MHz out for the RTCM. I<br>
> have been testing this over the past few days and it has made an great<br>
> improvement in the audio quality in the overlap. The quality of the<br>
> audio in the overlap areas sounds very, very good, it's very similar<br>
> to what I expect to hear in commercial simulcast systems. My circuit<br>
> is heavily based off of an old Motorola MSF5000 HSO PLL circuit that I<br>
> was able to adapt and modify to my needs. There are other uses for<br>
> this circuit that make it attractive for simulcasting but I wont get<br>
> into them here. I am will to share my schematic and bill of materials<br>
> (digikey) with anyone. Please send me an email and I will be willing<br>
> to share all of my information on the project.<br>
><br>
> <<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" rel="noreferrer" target="_blank">https://www.avast.com/sig-ema<wbr>il?utm_medium=email&utm_source<wbr>=link&utm_campaign=sig-email&<wbr>utm_content=webmail&utm_term=<wbr>icon</a>><br>
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