[amsat-bb] Half duplex operation on linear satellites

[Pierre van Deventer]

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