Dick Jansson-rr wrote: 
By "the command receiver" do you mean a fixed frequency demodulator
output for the IHU3?
    
Yes.  A fixed frequency separate input not in the passband.  I can hear
James Miller in my head : "We shan't have the punters confiscating the
command channel".
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 But if the punters are saturating the L Rx front end, the commanding
cannot get through to the decoder.

Dick, WD4FAB
Dick,

For this reason I totally separated IF chain for usesrs and for commands. The AGC influences only user's outputs.
The command receiver contains own filter shifted to the passband and works as limiting.

Mirek