On Tue, Nov 12, 2013 at 05:09:56PM +1100, Tony Langdon wrote: > On 12/11/13 12:17 AM, Paul Stoetzer wrote: > >An interesting idea would be trying a FreeDV QSO via satellite. I've made a > >few QSOs with it on HF and it's an interesting mode. > > > >Obviously it's full duty-cycle, so any attempts should be limited to just a > >few tests, but I'm sure it would work. > I suspect you'd need computer Doppler correction with the FDMDV > modem. The high PAPR would limit the stress on a linear > transponder. The (yet to be finalised) VHF GMSK variant might be > easier to handle from a Doppler point of view, though at a higher > average power (since it's constant envelope like FM).
You could simulate doppler by injecting a suitable voltage ramp into your RIT control, making your HF rig "drift" in a known way. -- Gordonjcp MM0YEQ _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
