Rockwells's military ARC-230 radio uses ISB to enable at least a theoretically possible 19.2kb per second with ALE through SCOPE Command -9600 kbps per sideband. O f course, they do not ever achieve that rate given today's sunspot situation but it is at least a laboratory possibility. The E-3A AWACS with an ARC-230 typically sees a far slower rate down in the 1200-2400 kbps range with the ARC-230 but it is a BLOS link that is secure and avoids the use of a precious satellite channel. And very importantly, the ground station has no need for an HF radio or its knowledge, just the SIPRNET and MS Outlook. This is all Google-able if you care to know more. Try SCOPE Command first.
Rick - KH2DF/W5 > > From: "expeditionradio" <[EMAIL PROTECTED]> > Date: 2007/02/01 Thu AM 10:43:04 EST > To: digitalradio@yahoogroups.com > Subject: [digitalradio] re:DSB, ISB, SSB, AMSC, LSB, USB, I/Q > > > Danny Douglas N7DC wrote: > > The best use of DSB in ham radio would be for SSTV or some > > such. You could have the picture on one side, and voice > > talking about it on the other. > > Hi Danny, > > That's commonly known as ISB (Independent Side Band). > > DSB, or AMSC, is commonly what you get when you amplitude modulate, > and suppress the carrier. I remember some inexpensive early Trio > (Kenwood) monoband DSB rigs in Japan in the 60's. There was a 15m and > a 40m version, and it had no clarifier! On the air, most of the SSB > ops didn't realize they were talking to a DSB station. My friend > JH1GNL, worked the world on 15m with one of those rigs. > > There is a big problem with DSB receivers trying to receive DSB > signals, but they do fine with SSB signals. When working another DSB > station, if you are not exactly tuned within a small fraction of a > hertz, the phase or beat frequency between USB and LSB will drive you > nuts trying to listen to it. :) > > Bonnie VR2/KQ6XA > > >
