Hi Jim; 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 <[EMAIL PROTECTED]> writes: > Ed, > > 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?
