[App_rpt-users] synchronizing transmitters for simulcast ( VCO Locking )

[Chuck Henderson]

I changed the subject :)

I don't think that the 1 PPS GPS will work for this.  You need a GPSDO with
a 10 MHZ output that then drives something like the micro-node.com PGCM
that then generates the exact clock frequency that your transmitter needs.
I do not know if they are still selling it or if there are similar products
available from other sources.

There is some information here.
http://ohnosec.org/pipermail/app_rpt-users/2012-May/004463.html

Let me know if you find what you need and get this working.  I am also
interested in simulcast but have been looking for an economical way to do
it.

Chuck,  WB9UUS




On Tue, Feb 25, 2014 at 4:35 PM, Wayne <wayne at anywherehost.net> wrote:

>   Thank you Jon Rorke for a well thought out reply. You hit the nail on
> the head and I haven't seen anything on this topic. That's why I asked. I
> have a Motorola MSF's and a Motorola MSR that have a VCO input and I was
> curious how to interface to it for simulcasting. I also have Motorola GPS
> receiver modules that plug into the repeaters. I sincerely apologize if
> some find this message thread as stupid, based on private emails, but not
> knowing where or who to ask I thought that this was the correct mailing
> list.
>
>
>
> Is there an easier way that as a noob with Allstar I just don't know about
> yet? If I read you correctly any GPS that provides a 1pps output provides
> the VCO locking in some form but is there a tutorial or a HOWTO that
> discusses this? I have a TKR-850 that I want to use as well and I'm not
> aware of a VCO input. If ya'll could just point me in the right direction
> I'd be much appreciative.
>
>
>
> I appreciate your helpful answer. Thank you.
>
>
>
> [Quote]
>
> uh,.... what?
>
> Seriously?  (I know I'm working on cup #1 and it's not quite 6am... I had
> to read this a couple of times to 'really' see this question and it's just
> as silly, every time!)
>
> [/QUOTE]
>
>
>
> Message: 1
>
> Date: Tue, 25 Feb 2014 08:49:33 -0500
>
> From: Jon Rorke <jrorke at cogeco.ca>
>
> To: app_rpt-users at ohnosec.org
>
> Subject: Re: [App_rpt-users] VCO Locking
>
> Message-ID: <530C9F6D.5060402 at cogeco.ca>
>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
>
>
> If you talking about synchronizing transmitters for simulcast, then that
> is done with an external reference oscillator (instead of the transmitter's
> internal ref Oscillator) at each site and that oscillator is locked by a
> GPS receiver to achieve very accurate frequency.
>
>
>
> Typically the external oscillator operates at some frequency like 16,
>
> 12.5 or 10 MHz but can be locked the GPS that puts out a 1 pps signal.
>
>
>
> Perhaps others can elaborate further.
>
>
>
> Jon VA3RQ
>
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