[PCR-1000] Re:Nonstandard Filter Modes

[Biastee]

If the filter's insertion loss is not an issue,
narrower BW can be obtained by cascading multiple
sections of std. BW. BWcomposite = inv (sqrt (inv
(BW1^2)) + (inv (BW2^2))).

> --__--__--
> From: Martin Francis <martin@classaxe.com>
Sadly, the
> problem here is one of bandwidth.  The narrowest
filter shown there claims
> to be 2KHz, but in fact 
> this is the exact same filter fitted in the Icom's
> 2.8KHz position.
> 
> If you happen to find any ceramic / mechanical or
> crystal filter offering a 
> narrow bandwidth (say 1KHz or less) I'd be very
> interested in fitting one. (snipped)


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