On Wed, Feb 2, 2011 at 1:01 PM, Charles P. Steinmetz <charles_steinm...@lavabit.com> wrote: > Chris wrote: > >> A notch filter can also be constructed to notch out the jammer if it >> is out of band. A "twin T" design might be effective and low cost > > Unfortunately, unless the interfering carrier is much too far away to be a > problem in the first place, the phase shift of the notch filter (and > particularly its changes with temperature) will appear essentially as a > variable-length coax on your antenna -- not what you want for precision > timing applications.
What would be the range of variability? Are we talking about 10% of the period of the 1.5GHz signal? I could live with that or is the effect much greater? My simple understanding of the twin-t comes from my use of it at audio frequencies. Maybe there are better filter designs. -- ===== Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
