> So, can anyone tell
> me what the usual practice is when you have a shielded can with
> several RF signals present inside and you want to get *one* of them
> out without the others leaking in?
I used to service 19" rack frequency synthesizers and once the lid was 
removed, each small part of the circuit was on its own pcb in its own small 
compartment (down to about 1" square). Feedthroughs were used for supplies 
and signals went via coax was passed through holes in the walls.

George Smith

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