Re: [App_rpt-users] App_rpt-users Digest, Vol 99, Issue 9
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@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)
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Message: 1 Date: Sun, 7 May 2017 03:13:26 -0400 From: Joe Moskalski <kc2irv@gmail.com> To: app_rpt mailing list <App_rpt-users@ohnosec.org> Subject: [App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking Message-ID: <CAES28qyXLtJMUoGqAYk5bKU_eE2Nciq_9QQC48rBDSeZigtgHA@ 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.
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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@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@lists. allstarlink.org> wrote:
Send App_rpt-users mailing list submissions to app_rpt-users@lists.allstarlink.org
To subscribe or unsubscribe via the World Wide Web, visit http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rp t-users or, via email, send a message with subject or body 'help' to app_rpt-users-request@lists.allstarlink.org
You can reach the person managing the list at app_rpt-users-owner@lists.allstarlink.org
When replying, please edit your Subject line so it is more specific than "Re: Contents of App_rpt-users digest..."
This site is dedicated to the memory of Jim Dixon WB6NIL
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@gmail.com> To: app_rpt mailing list <App_rpt-users@ohnosec.org> Subject: [App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking Message-ID: <CAES28qyXLtJMUoGqAYk5bKU_eE2Nciq_9QQC48rBDSeZigtgHA@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.
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Dial running on my raspberry pi 3 is for some reason triggering the radio to key up for about a second or so every 8 to ten seconds. I finally had to turn off the radio to get it to stop kerchunking. Is there some setting I could change to fix this? I’ve tried changing rx squelch to a higher number to see if something is barely breaking the squelch, but no luck. I also tried unplugging the radio from the usb radio interface. this does stop the kerchunking, but it doesn’t explain why it does it constantly when it is hooked up. It’s all a big mystery to me. I am using a Wouxun kg-uv6d ht for the radio. any help would be greatly appreciated. If I can provide further information I’d be happy to. kind regards, Ben, (KD8TIG)
Could your radio be configured to go into a power saving mode that is impacting the signals feeding your fob/URI ? It would be in one of the radio's menus. If so, disable it. tnx Mike / W5JR Alpharetta GA
On May 9, 2017, at 6:47 PM, TheSkyDancer (KD8TIG) <kd8tig@blazingstarradio.com> wrote:
Dial running on my raspberry pi 3 is for some reason triggering the radio to key up for about a second or so every 8 to ten seconds. I finally had to turn off the radio to get it to stop kerchunking. Is there some setting I could change to fix this? I’ve tried changing rx squelch to a higher number to see if something is barely breaking the squelch, but no luck. I also tried unplugging the radio from the usb radio interface. this does stop the kerchunking, but it doesn’t explain why it does it constantly when it is hooked up. It’s all a big mystery to me. I am using a Wouxun kg-uv6d ht for the radio. any help would be greatly appreciated. If I can provide further information I’d be happy to.
kind regards, Ben, (KD8TIG) _______________________________________________ App_rpt-users mailing list App_rpt-users@lists.allstarlink.org http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
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participants (4)
-
Jeff Carrier -
Joe Moskalski -
Mike - W5JR -
TheSkyDancer (KD8TIG)