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

Pierre Martel petem001 at gmail.com
Wed Jun 7 18:44:52 UTC 2017 

So It would be good, now from what Info I have, I will still need another
gps for the nmea and 1 pps to feed the rtcm?


Le mer. 7 juin 2017 à 03:46, Joe Moskalski <kc2irv at gmail.com> a écrit :

> 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.
>>>>>>>
>>>>>>>
>>>>>>> ______________________________ _________________
>>>>>>> App_rpt-users mailing list
>>>>>>> App_rpt-users at lists.allstarlin k.org
>>>>>>> <App_rpt-users at lists.allstarlink.org>
>>>>>>> http://lists.allstarlink.org/c gi-bin/mailman/listinfo/app_rp t-users
>>>>>>> <http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users>
>>>>>>>
>>>>>>> To unsubscribe from this list please visit http://lists.allstarlink.org/c
>>>>>>> gi-bin/mailman/listinfo/app_rp t-users
>>>>>>> <http://lists.allstarlink.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.
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> App_rpt-users mailing list
>>>>>>> App_rpt-users at lists.allstarlink.org
>>>>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>>>>
>>>>>>> To unsubscribe from this list please visit http://lists.allstarlink.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.
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> App_rpt-users mailing list
>>>>>>> App_rpt-users at lists.allstarlink.org
>>>>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>>>>
>>>>>>> To unsubscribe from this list please visit
>>>>>>> http://lists.allstarlink.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.
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> App_rpt-users mailing list
>>>>>>> App_rpt-users at lists.allstarlink.org
>>>>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>>>>
>>>>>>> To unsubscribe from this list please visit
>>>>>>> http://lists.allstarlink.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.
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> --
>>>>>> Tim
>>>>>> _______________________________________________
>>>>>> App_rpt-users mailing list
>>>>>> App_rpt-users at lists.allstarlink.org
>>>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>>>
>>>>>> To unsubscribe from this list please visit
>>>>>> http://lists.allstarlink.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.
>>>>>
>>>>> _______________________________________________
>>>>> App_rpt-users mailing list
>>>>> App_rpt-users at lists.allstarlink.org
>>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>>
>>>>> To unsubscribe from this list please visit
>>>>> http://lists.allstarlink.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.
>>>>
>>>> --
>>>> --
>>>> Tim
>>>>
>>>> _______________________________________________
>>>> App_rpt-users mailing list
>>>> App_rpt-users at lists.allstarlink.org
>>>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>>>
>>>> To unsubscribe from this list please visit
>>>> http://lists.allstarlink.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.
>>>>
>>>
>>>
>> _______________________________________________
>> App_rpt-users mailing list
>> App_rpt-users at lists.allstarlink.org
>> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>>
>> To unsubscribe from this list please visit
>> http://lists.allstarlink.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.
>>
>
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users at lists.allstarlink.org
> http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
>
> To unsubscribe from this list please visit
> http://lists.allstarlink.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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.keekles.org/pipermail/app_rpt-users/attachments/20170607/a0bb459e/attachment.html>

More information about the App_rpt-users mailing list