[Elecraft] Talking filter Bandwidths

[Bob Tellefsen]

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