[App_rpt-users] App_rpt-users Digest, Vol 99, Issue 9

Joe Moskalski kc2irv at gmail.com
Sun May 7 23:10:21 EDT 2017


Jeff,
Yes it is getting its 10 MHz reference from a GPSDO, the BG7TBL unit to be
exact.

On Sun, May 7, 2017 at 9:32 PM, Jeff Carrier <k0jsc.jeff at gmail.com> wrote:

> Joe,
>
> Did you lock it to a GPSDO?  Jim mentioned this mod to me about a year ago
> and I never had a chance to give it a try.  My previous overlap area was
> tolerable but I've added a third transmitter so it may be time to try this
> finally.
>
> On Sun, May 7, 2017 at 10:00 AM, <app_rpt-users-request at lists.
> allstarlink.org> wrote:
>
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>> Today's Topics:
>>
>>    1. RTCM Simulcast and 9.6 MHz Phase locking (Joe Moskalski)
>>    2. Re: RTCM Simulcast and 9.6 MHz Phase locking (Joe Leikhim)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sun, 7 May 2017 03:13:26 -0400
>> From: Joe Moskalski <kc2irv at gmail.com>
>> To: app_rpt mailing list <App_rpt-users at ohnosec.org>
>> Subject: [App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking
>> Message-ID:
>>         <CAES28qyXLtJMUoGqAYk5bKU_eE2Nciq_9QQC48rBDSeZigtgHA at mail.
>> gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> 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.
>>
>> <https://www.avast.com/sig-email?utm_medium=email&utm_source
>> =link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
>> Virus-free.
>> www.avast.com
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>> ------------------------------
>>
>> Message: 2
>> Date: Sun, 7 May 2017 03:42:25 -0400
>> From: Joe Leikhim <rhyolite at leikhim.com>
>> To: Users of Asterisk app_rpt <app_rpt-users at lists.allstarlink.org>
>> Subject: Re: [App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking
>> Message-ID: <35ee60f8-a760-363b-0d28-1b6c9967cebd at leikhim.com>
>> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>>
>> Thanks Joe;
>>
>> I would certainly be interested in your documentation. Does this solve
>> the problem of transmit PL tone jumping phase on key up, as Hayden
>> encountered?
>>
>> Joe L
>>
>> 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.
>> >
>> > <https://www.avast.com/sig-email?utm_medium=email&utm_source
>> =link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
>> >       Virus-free. www.avast.com
>> > <https://www.avast.com/sig-email?utm_medium=email&utm_source
>> =link&utm_campaign=sig-email&utm_content=webmail&utm_term=link>
>> >
>> >
>> >
>> >
>> > _______________________________________________
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>> --
>> Joe Leikhim
>>
>>
>> Leikhim and Associates
>>
>> Communications Consultants
>>
>> Oviedo, Florida
>>
>> JLeikhim at Leikhim.com
>>
>> 407-982-0446
>>
>> WWW.LEIKHIM.COM
>>
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>> End of App_rpt-users Digest, Vol 99, Issue 9
>> ********************************************
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>
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