<div dir="ltr">Jim,<div><br></div><div style>Just a quick question, I am looking into simulcasting, can you please explain what the 9.6MHz is for? is it for the RTCM internal clock or the MSF5000? I thought the RTCM required only a 1PPS the get phase coherence of the modulating signal.</div>
<div style><br></div><div style>I guess that this is the more general question about simulcast:</div><div style><br></div><div style>Phase coherence of the modulating signal is required. </div><div style>Is phase coherence of the carrier required for FM simulcast or is locking to a accurate frequency source sufficient? E.g. a rubidium oscillator, which would give you frequency stability but not phase coherence.</div>
<div style><br></div><div style>Thanks</div><div style>Andrew</div><div style><br></div></div><div class="gmail_extra"><br clear="all"><div>Thanks :-)<br>Andrew Gilbett<br><a href="mailto:andrew.gilbett@gmail.com">andrew.gilbett@gmail.com</a></div>
<br><br><div class="gmail_quote">On 31 October 2013 13:03, Jim Duuuude <span dir="ltr"><<a href="mailto:telesistant@hotmail.com" target="_blank">telesistant@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr">For simulcast ALL OF YOUR TRANSMITTERS NEED TO BE IDENTICAL (ELECTRICALLY).<br><br>That means that they need to be the same model of transmitter, and TUNED to be<br>identical as possible.<br><br>So, you need to have the same model of MSF5000 at both sites. That's a darned good<br>
radio for this purpose.<br><br>There needs to be a GPSDO (such as a Trimble Thunderbolt), and an RTCM at each transmitter<br>site. There also needs to be an RTCM and GPS-based timing source physically on the same<br>LAN as the host computer (which also might be one of the radio sites).<br>
<br>Note, if you are intending to use a current model RTCM (or voter board) for simulcast, you<br>will need to modify it for simulcast compatibility (which requires injection of external GPS-locked<br>9.6 MHz for the CPU), or wait until Mark comes out with the new version of the RTCM that includes<br>
the option for this built-in.<br><br>Jim WB6NIL<br><br><div><hr>From: <a href="mailto:petem001@hotmail.com" target="_blank">petem001@hotmail.com</a><br>To: <a href="mailto:app_rpt-users@ohnosec.org" target="_blank">app_rpt-users@ohnosec.org</a><br>
Date: Wed, 30 Oct 2013 15:20:15 -0400<br>Subject: [App_rpt-users] multicasting.<div><div class="h5"><br><br>
<div dir="ltr">
<div style="font-size:12pt;font-family:'Calibri'">
<div>Got a problem with one of my repeater.</div>
<div> </div>
<div>I live in Montreal QC, and as many of you know we are bless with a small
mountain right in the middle of the city. (Mount-Royal) While if you have the
blessing of having a repeater on top of it, the coverage is marvellous. (but I
am not blessed at all!!!) </div>
<div> </div>
<div>So I have nice repeater to cover the north, east, and south of the city,
but the damn mountain prevent me from covering properly the west part of the
city. </div>
<div> </div>
<div>So I was looking at the rtcm to make a multicast/voter system on the other
side of the mountain. </div>
<div> </div>
<div>I have a MSF5000 UHF at the main repeater site, would I be able to use that
with the rtcm and I can have a TKR-820 as the remote repeater would I be able to
use it too? Or I also have a Desktrac that used to be the UHF repeater before
the MSF500 came along..</div>
<div> </div>
<div>What would I need to do make sure that its all stable? I think I would need
at least 2 rtcm, But I would loose the dsp decoding of ctcss and squelch? </div>
<div> </div>
<div>Lots of question..</div>
<div> </div>
<div>Pierre</div>
<div>VE2PF</div>
<div> </div>
<div> </div>
<div> </div></div></div>
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