[App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking
Joe Leikhim
rhyolite at leikhim.com
Fri May 12 19:08:31 UTC 2017
I have searched for documentation on the PCGM. can you point me to the
enclosure?
On 5/11/2017 11:12 PM, Tim Sawyer wrote:
> The one it comes with.
>
> On Mon, May 8, 2017 at 11:24 PM, Joe Leikhim <rhyolite at leikhim.com
> <mailto:rhyolite at leikhim.com>> wrote:
>
> I wonder what kind of enclosure he had it in?
>
>
> On 5/8/2017 11:10 PM, Tim Sawyer wrote:
>> 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 <mailto: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 <tel:%28727%29%20409-1194>
>>
>> On May 8, 2017, at 14:15, Reid Brandon <rfpowerguy at yahoo.com
>> <mailto: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 <mailto: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
>>> <mailto: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
>>
>>
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>
> --
> Joe Leikhim
>
>
> Leikhim and Associates
>
> Communications Consultants
>
> Oviedo, Florida
>
> JLeikhim at Leikhim.com <mailto:JLeikhim at Leikhim.com>
>
> 407-982-0446 <tel:%28407%29%20982-0446>
>
> WWW.LEIKHIM.COM <http://WWW.LEIKHIM.COM>
>
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> --
> --
> Tim
>
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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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