"Arid ace" wrote in message
news But because at that time circuits weren't
simulated, it was overlooked that due to the diode capacitance, filters
supposed
to be switched out,
Hi
Such effects do exist with any switches.
Behaviour of filters with a very mismathed input and output impedances is
very
unpredictable.
For switching IF filters logic would be to cascade them and shunt the too
narrow ones.
I have never seen this implemented.