Hi Trevor,
On 22-05-12 23:33, Trevor . wrote: > --- On Tue, 22/5/12, Kristoff Bonne <[email protected]> wrote: >> Conventional wisdom says that you cannot relay D-STAR >> signals over a traditional FM relais. Would a digital protocol at >> 2400 baud any better of in this? And, if yes, would this -if you >> ignore the issue of doppler-shift for the time being- this mean that >> would also work over a satellite FM relais? > The first amateur satellite QSO using D-STAR digital voice was through the FM > satellite AO-27 in 2007, details at > http://www.southgatearc.org/news/july2007/dstar_satellite_qso.htm That article says that AO-27 FM transponder is actually specialy designed for "9600 bps" operations. I don't know if this common for most satellites. But, let's make the question more general: Concidering the "common knowledge" that a FM repeater cannot repeater a 4800 bps GMSK signal; would a GMSK signal at 2400, 1800 or 1200 bps do better? (It would be nice if it would, as this means that 2400 bps codec2 over VHF would have an advantage over D-STAR). 73 Kristoff - ON1ARF ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
