Ok, thank you, now I can be sure I get the correct GPS reference unit. Thank you for the link, I had not seen this before.

With this information I will be using this unit for my GPS data, 1pps and 10 Mhz. I have tested one of these it should will work.

http://www.ebay.com/itm/10MHZ-Output-Sine-Wave-GPS-Disciplined-Clock-GPSDO-Antenna-Power-Supply-USA-/281802105734?hash=item419cb6e386:g:to0AAOSwKIpV-hf7

Also does anyone know of someone who has successfully setup a simulcast system with the RTCM's? I was just wondering if I could touch base with them and possibly avoid any common pitfalls.

Just in case any one was wondering I will be using Kenwood TKR-840 repeaters for this project.

Another question I have is there are references to the votmond java application for monitoring the system but I believe Allmon2 succeeds votmond, is this correct?

On Sat, Jun 4, 2016 at 9:09 PM, Lee Woldanski <ve7fet@tparc.org> wrote:

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@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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