[amsat-bb] Re: Half duplex operation on linear satellites
glasbrenner at mindspring.com
Wed Nov 4 04:43:29 PST 2009
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
More information about the AMSAT-BB