[App_rpt-users] RTCM Simulcast question

[Lee Woldanski]

Hi Joe,

I can answer part of that for you.

You do need a GPS with NMEA or TSIP. The RTCM needs to know the time so it
can time stamp the UDP packets when sending them to the server.

If you go to http://svn.ohnosec.org/viewvc/projects/allstar/voter/?root=svn
and look at the VOTER Protocol.pdf and the votersystem.pdf, and look at the
protocol parts, you may answer some of your questions.

I know the required NMEA sentences are out there somewhere, but I don't
recall where I saw them.

You can adjust the launch delay on each RTCM, but I do not believe it does
any sort of auto adjust.


Lee

On Sat, Jun 4, 2016 at 6:03 PM, Joe Moskalski <kc2irv at gmail.com> wrote:

> I will be setting up a 2 site UHF simulcast system in the coming months
> and so far I have only one question to ask. The RTCM manual is a little
> vague on the GPS part of the setup. Normally, with other types of radio
> simulcast products (which I am very familiar with several) all you need to
> properly time the audio is a 1 pps signal from the GPS reference. The RTCM
> manual makes mention of the NMEA/TSIP data being connected but does not
> explicitly say if that serial data is needed or if only the 1 pps is needed
> for simulcast operation. From the other simulcast products I have worked
> with, you set your bulk delay to a value larger then the delay required for
> the furthest site and the system will adjust. Does the RTCM version of
> simulcast work the same way? I just want to be sure because this will
> determine what type of GPS locked reference oscillator I choose for the
> project.
>
> Regards,
> KC2IRV
> -Joe
>
>
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-- 
Lee Woldanski, AScT
VE7FET
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