The RSID is good but is it overly complicated? What if a pilot tone or tones were sent indicating the mode? Maybe 25 msecs of tones with changes at 5 msecs. These tones would also establish the center (or edge) frequency for the mode so auto-tuning might be possible.
A pattern might be 1k and 1.2k for 5 msecs, then 1k and 1.4k, then 1.2k and 1.4k ... Some modes like PSK31 might not need a dedicated tone since the idle patter is unique. The drawback to RSID is you have to get a good decode. Something simpler like a set of relatively long durations tones might be more robust. - 73 - Rud Merriam K5RUD ARES AEC Montgomery County, TX http://TheHamNetwork.net > -----Original Message----- > From: Simon (HB9DRV) [mailto:simon.br...@kns.ch] > Sent: Saturday, May 02, 2009 9:50 AM > To: digitalradio@yahoogroups.com > Subject: Re: [digitalradio] Re: Mode of the Day? RS ID on SdR > bandwidth > > > I've just looked at Vojtech's code, it seems reasonable *and* he's > resampling from 8kHz up to 11.025kHz. > > If I can get this working (and why not!) then I suggest we > attempt to for a > standard for the RSID codes similar to the SSTV VIS codes, maybe even > storing the standard in this forum. > > This will really help when not using a 'standard' mode such > as PSK31, 63 or > RTTY. > > Simon Brown, HB9DRV > www.ham-radio-deluxe.com > > ----- Original Message ----- > From: "Vojtech Bubnik" <bubn...@seznam.cz> > > > > My code is derived from Patrick's, only I heavily optimized it to be > > executed on a less powerful fixed point arithmetics CPU. I > am obsessed > > with optimization to increase battery life of the Pocket PC device. > > > > ------------------------------------ > > Announce your digital presence via our Interactive Sked Pages at > http://www.obriensweb.com/sked > > Recommended digital mode software: Winwarbler, FLDIGI, > DM780, or Multipsk > Logging Software: DXKeeper or Ham Radio Deluxe. > > > > Yahoo! Groups Links > > >
