Thank you, Chuck I knew I couldn’t
be the only one running into this. A huge help! Thank you, sir!! We really want
to make this work but aren’t sure how to completely get there. We can
link just fine. It’s the simulcast part that is causing me a belly ache.
From: Chuck Henderson
[mailto:rpt2@chuck.midlandsnetworking.com]
Sent: Tuesday, February 25, 2014
3:24 PM
To: Wayne
Cc: app_rpt mailing list
Subject: synchronizing
transmitters for simulcast ( VCO Locking )
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.
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,
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@cogeco.ca>
Subject: Re: [App_rpt-users] VCO Locking
Message-ID: <530C9F6D.5060402@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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