What is the problem with the RTCM and simulcast? Analog simulcast may never sound as good as a single site, because it does experience/cause time differential interference and noise and therefore requires some very specific design constraints. However, for some applications it still is the way to go. Moving forward 5-10 years, two slot DMR with IP connectivity will be the way to go. Before I get flamed, TETRA never got a foothold in the US and because FCC eliminated most 25KHz channels, getting TETRA to play in the US is reserved for those few who have the contiguous spectrum. I will confess to being a lurker here, primarily because I have interests both in the commercial LMR and the "ham radio". The RTCM and IP Simulcast support interests me because I have done a lot of simulcast design work in Public Safety and the commercial support of analog simulcast is becoming threatened with the loss of Raytheon JPS SNV-12 product. Also the commercial products are very pricey and complex. That being said, I see the RTCM as having some potential niche in the commercial LMR world. Joe On 3/30/2016 2:52 PM, Steve Wright wrote:
On 31/03/16 05:28, Jeff Ackerman wrote:
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.
Obviously the 'no timing' situation is not completely traumatic for the conversational use of the repeater, as there is no widespread comments or negativity about it.
The RTCM is a good idea and a good design, but with the Simulcast transmit not functioning, and no apparent developer activity there's just not enough light at the end of the tunnel to commission it everywhere.
It seems to me that analog simulcast transmit is never really going to sound right. I feel uneasy about the relentless approach of digital audio into ham radio, but maybe the dream of zero-handoff multi-rx multi-tx systems means 'digital' and we're stuck with it. I'd like to be proven wrong on that.
Steve
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-- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida JLeikhim@Leikhim.com 407-982-0446 WWW.LEIKHIM.COM