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. 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@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@cogeco.ca> To: app_rpt-users@ohnosec.org 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 _______________________________________________ App_rpt-users mailing list App_rpt-users@ohnosec.org http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button" You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.