Maybe I am way off here and there are plans to use voting for digital down the road like Digitac Motorola does. They go further and actually reconstruct packets that fail from a site using data from all sites. Having said that, in the analog world using Moto SpectraTac comparators for many years it wasn't that noticeable because all was analog from every field receiver in a 1247 square mile County. With the ADC to DAC process, I shudder at thinking of a timed referencing synchronization of various source sites using public Internet transport. I mean even in the "fire and forget" world of UDP protocol, the network cannot cope. Unless you are talking private links using microwave unlicensed spectrum technology, I think it may be a hair puller. Interesting project though. On Mar 30, 2016 12:30, <app_rpt-users-request@ohnosec.org> wrote:
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Today's Topics:
1. Re: Non-RTCM voter, where? (Jeff Ackerman) 2. Re: Non-RTCM voter, where? (Bryan Fields)
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Message: 1 Date: Wed, 30 Mar 2016 09:28:32 -0700 From: Jeff Ackerman <kg6uyz@gmail.com> To: Joe Leikhim <rhyolite@leikhim.com> Cc: info@meshnetworks.co.nz, app_rpt mailing list <app_rpt-users@ohnosec.org> Subject: Re: [App_rpt-users] Non-RTCM voter, where? Message-ID: < CAKmcLtJRAnL_-rPHYQHs6cq-eyXY3FmxC-FkNU9rbWUU9+NkYQ@mail.gmail.com> Content-Type: text/plain; charset="utf-8"
XIPAR does not do GPS timing of the audio so there will be no timing of audio. Its called "simple voter", no frills. XIPAR simply selects the best receiver based on DSP signal strength measurements.
On Wed, Mar 30, 2016 at 9:01 AM, Joe Leikhim <rhyolite@leikhim.com> wrote:
Without GPS, how does XIPAR deal with jitter and network latency?
On 3/30/2016 11:25 AM, Jeff Ackerman wrote:
If you looking for the alternative IP voting of the varuious app_rpt flavors you can try XIPAR: <http://www.xelatec.com/xipar/simplevoter> http://www.xelatec.com/xipar/simplevoter
It wont be as seamless of voting as a RTCM, but its much simpler, doesnt require anything more then PC's, the IP backhaul and usb radio interfaces with radios capable of giving discriminator audio.
Conventional hardware voting comparators could work but require the backhaul, which in most commercial applications is 4 wire e&m voice circuits using either tone signaling or e&m signaling. (This method of voting is done outside of allstar/app_rpt.)
On Wed, Mar 30, 2016 at 8:09 AM, Joe Leikhim <rhyolite@leikhim.com> wrote:
Here are some products to start with;
There is the Raven M4x
http://www.ravencomm.com/documents/products_doc3_23.pdf
Raytheon JPS SNV-12 (Though the future of this product is up in the air, it was the defacto standard. Uses 600 ohm VF circuits, IP connectivity needs to be overlaid) http://www.simulcastsolutions.com/userfiles/file/appnotes/vSnv12App.pdf
Motorola Spectra Tac (Obsolete Now Motorola has pretty much abandoned analog FM technology. Uses 600 ohm VF circuits,)
http://www.repeater-builder.com/motorola/spectra-tac/spectratac-index.html
The above voters all use some method of signal/noise voting. The JPS SNV-12 and the Raven M4X use DSP to make decision, while the Spectra Tac was pretty much an analog noise measurement vs a status tone/audio AGC level. The SpectraTac does not support non-Motorola receivers unless you know the "secret sauce" which I am privy to.
This site has some practical examples of projects that are simulcast,
but
by design incorporate the SNV-12 voters.
www.simulcastsolutions.com
Are you looking for some more in depth RF design aspects of receiver voting? I can help perhaps.
Joe
www.leikhim.com
On 3/8/2016 5:20 AM, Steve Wright wrote:
On 05/03/16 06:00, mike@midnighteng.com wrote:
FYI There are RTCM /voter systems for app_rpt if you want to do it right.
Is there an example voting-RX project somewhere I can read about?
Non-RTCM please. I know about the RTCM and I'm looking at alternatives.
Many thanks, Steve
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-- Jeff Ackerman kg6uyz@gmail.com
-- Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida JLeikhim@Leikhim.com 407-982-0446 WWW.LEIKHIM.COM
-- Jeff Ackerman kg6uyz@gmail.com