Pierre van Deventer wrote: > Good day all, > > I would like to know if there are *any* stations operating on the satellites > with linear transponders e.g. on AO-7, that use "fixed uplink, half duplex" > on a regular basis? > > Is done, is it allowed or is it actively discouraged? > > Feedback will be appreciated. > > Kind Regards. > > 73, Pierre ZS6BB > Half duplex, yes, with care given to run appropriately low power levels.
The fixed uplink part is probably being done, but it is counter to preferred and recommended practice on Mode U/V satellites. It likely will make little difference where the user load is light, but when the transponder gets crowded, a fixed uplink sweeps across ~15 khz of passband and can be disruptive to other users. If someone is restricted to half duplex, computer aided tuning on both the uplink and downlink really makes a lot of sense for their ease, and for staying out of other QSOs. 73, Drew KO4MA _______________________________________________ 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
