Re: Talking filter Bandwidths
Posted by
n6wg on
Nov 13, 2004; 4:28pm
URL: http://elecraft.85.s1.nabble.com/Talking-filter-Bandwidths-tp371577p371578.html
Deni
In the past, the -6 dB number was usually paired with a -60 dB number
to calculate the shape factor of the filter.
It would be the -60dB bw divided by the -6 dB bw, to give a shape
factor somewhere between 1 (vertical sided passband) and maybe
2 at the worst.
Not sure where the -3dB comes from, maybe advertising? :-) Makes
the filter bandwidths look better.
73, Bob N6Wg
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