|[AMRadio] Frequency Response|
Edward B Richards
zuu6k at juno.com
Sat Sep 25 13:54:00 EDT 2004
For the 55 years I have been in electronics, bandwidth has always been
defined as the half voltage points (-6dB). We all know that band passes
don't have vertical sides. Therefore it will be narrower above the -6 dB
points and wider below. Thanks for your input.
73, Ed Richards K6UUZ
On Sat, 25 Sep 2004 10:29:14 -0700 (PDT) Jim Candela
<jcandela at prodigy.net> writes:
> You make a good point. I do however need to bring up that
> bandwidth needs to be specified with a certain roll off in DB. For
> example a mechanical filter in a receiver is often specified at -6,
> and -60 db and with a certain shape factor.
> A clean AM ham rig may be 30 Khz wide at the - 60 db points +/-
> 15 Khz away from the carrier. That same rig may be 6 Khz wide at the
> -6 db points, and 8 Khz wide at the -20 db points. So what bandwidth
> is this rig?
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