[App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking

Reid Brandon rfpowerguy at yahoo.com
Mon May 8 14:11:29 EDT 2017


Hi Joe,I got a page with a pic of a man that rotated  around saying DOWNLOAD NOT FOUND.Try again!?Tks  Reid
 

    On Sunday, May 7, 2017 12:25 PM, Pierre Martel <petem001 at gmail.com> wrote:
 

 I am very interrested in all this project. My email is VE2PF @ VE2MRC dot com!
what radio did you used for the project? 
Thanks for sharing!
PierreVE2PF

2017-05-07 12:32 GMT-04:00 Kevin Custer <kuggie at kuggie.com>:

Joe,

Why not consider do it as an article for Repeater Builder?

Thanks,
Kevin


On 5/7/2017 3:13 AM, Joe Moskalski wrote:

I wanted to throw this email out to the group for all those who want to simulcast with the RTCM. For those who don't know, in order to make the RTCM suitable for simulcast you must have a more accurate 9.6 MHz clock for the RTCM in order to ensure the audio sounds acceptable in the overlap areas. I did this a few months ago using 9.6 MHz OCXO's. This worked reasonably well. Not as well as I would have liked but the system was very usable, but of course I wanted it to be better. Since the PCGM (Programmable Clock Generation Module) is no longer available, I decided to roll my own as some say.
I created a PLL circuit that can accept a 10 MHz, 1 MHz or 100 KHz reference input and produce a phase locked 9.6 MHz out for the RTCM. I have been testing this over the past few days and it has made an great improvement in the audio quality in the overlap. The quality of the audio in the overlap areas sounds very, very good, it's very similar to what I expect to hear in commercial simulcast systems. My circuit is heavily based off of an old Motorola MSF5000 HSO PLL circuit that I was able to adapt and modify to my needs.  There are other uses for this circuit that make it attractive for simulcasting but I wont get into them here. I am will to share my schematic and bill of materials (digikey) with anyone. Please send me an email and I will be willing to share all of my information on the project.


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