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IF selectivity

IF selectivity

IF selectivity

(OP)
In a heterodyne receiver, does the 1st IF stage has to be wider than the second stage?  Basically in IF selectivity for receivers, are the IF stages require to be designed so that the stages are decreasing in bandwidth?   If they don't please explain why?

RE: IF selectivity

It wouldn't make much sense to have a wider filter following a narrow filter.
 

RE: IF selectivity

The thinking may come from the staggered tuning that once was used to produce IF stages with steep cut-off but enough BW to let music through in old AM heterodynes.

Long time that I haven't been close to RF/IF - is that technique still used?  

Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

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