> 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?

Well, as someone else pointed out, 'proper' instruments like signal 
generators have a shielded compartment for each signal, feeding power 
through feedthrough capacitors between sections, using supply line RF 
chokes, and having proper signal lines as well.

>50 ohm in/output impedance, real SMA connectors, real RF cables

Between sections, using bulkhead connectors to stop RF leakage etc.

It is this sort of 'heavy' engineering around RF that causes people to think 
it is a 'black art' ;)))

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