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VNA block diagram.

Question asked by drkirkby on Sep 25, 2012
Latest reply on Sep 30, 2012 by SOLT_guy
I'm reading Joel Dunsmore's book "Handbook of Microwave Components Measurements with Advanced VNA Techniques".

I'm studying diagrams 2.1 and 2.2 which have block diagrams of VNAs. Am I correct in assuming the local oscillator and source oscillator will always differ by some fixed offset equal to the IF frequency, in much the same way is in a superhetrodyne receiver? 

I assume the IF bandwidth is then set by a filter (probably digital in more modern units) at whatever the IF frequency is. Am I correct there?