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

Wed Jun 7 07:46:00 UTC 2017

I purchased one of those units about 2 months ago and they work extremely
well. I have used it to allow the use of Motorola Maxtrac's and GM300's for
simulcast operation by externally injecting a 14.4 MHz reference into the
radio from this unit.
if you want a ready-made solution that will give you GPS locked accuracy
and is programmable to just about any frequency you would need than this is
it.

On Tue, Jun 6, 2017 at 5:00 PM, Pierre Martel <petem001 at gmail.com> wrote:

> after reading on gps locked clock and  pll found this.
> http://www.leobodnar.com/shop/index.php?main_page=product_
> info&cPath=107&products_id=234
>
> Low-jitter GPS-locked precision frequency reference
> 450 Hz to 800 MHz output
>
> this could be usefull to steer about any radio model no?
>
> Is it worth the time and money to try with this device?
>
> Le ven. 12 mai 2017 à 17:39, Pierre Martel <petem001 at gmail.com> a écrit :
>
>> A big thanks Tim. I feel less uneducated ;-) Will have to get a look at
>> this..
>>
>> 2017-05-12 12:03 GMT-04:00 Tim Sawyer <tisawyer at gmail.com>:
>>
>>> Political Correctness Gone Mad. 😄
>>>
>>> Actually it's Programmable Clock Generator Module.
>>>
>>> K
>>>
>>> On Thu, May 11, 2017 at 8:38 PM Pierre Martel <petem001 at gmail.com>
>>> wrote:
>>>
>>>> I know there is always the one that ask the obvious question but, what
>>>> is a pcgm?
>>>>
>>>>
>>>> Le lun. 8 mai 2017 à 23:10, Tim Sawyer <tisawyer at gmail.com> a écrit :
>>>>
>>>>> The PCGM were noisy. I know of a case where a ham using one was shut
>>>>> down by the site owner. Seems the PCGM was emitting a interfering signal on
>>>>> high band, around 158 Mhz.
>>>>>
>>>>> On Mon, May 8, 2017 at 1:33 PM, Bryan Fields <bryan at bryanfields.net>
>>>>> wrote:
>>>>>
>>>>>> I've been following this with some interest.  One of the fundamental
>>>>>> issues with the PCGM was the master clock going to the radio was unable to
>>>>>> be modulated.  This made low frequency signals (PL) distort, and digital PL
>>>>>> was even worse.
>>>>>>
>>>>>> Typically most radios use two point modulation, with modulation on
>>>>>> the reference oscillator.  When you add an external reference you loose
>>>>>> this.
>>>>>>
>>>>>> Some base stations are designed to do two point modulation even on an
>>>>>> external clock, the Quantar for example.  This station will even phase lock
>>>>>> it's PL and DPL generation if provided a 1 PPS in addition to a clock.
>>>>>>
>>>>>> If we could inject modulation into the clock generator simulcast
>>>>>> performance would vastly improve.  I'd be interested to see your design to
>>>>>> see if this would be a possibility.
>>>>>>
>>>>>> Thoughts?
>>>>>>
>>>>>> --
>>>>>> Bryan Fields
>>>>>> M: +1-727-409-1194 <(727)%20409-1194>
>>>>>>
>>>>>> On May 8, 2017, at 14:15, Reid Brandon <rfpowerguy at yahoo.com> wrote:
>>>>>>
>>>>>> 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!
>>>>>>
>>>>>> Pierre
>>>>>> VE2PF
>>>>>>
>>>>>>
>>>>>> 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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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> --
>>>>> Tim
>>>>> _______________________________________________
>>>>> App_rpt-users mailing list
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>>>>
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>>>
>>> --
>>> --
>>> Tim
>>>
>>> _______________________________________________
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>>
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