Hi > On Mar 6, 2016, at 2:31 PM, Joseph Gray <jg...@zianet.com> wrote: > > Assuming I made the pictures small enough, attached are two images of > an very old crystal filter that a friend found. The strange thing > about it is the bandwidth - 100 Hz. What could this have been used > for, with such a narrow bandwidth? > >
Pilot tone recovery on a FDM system would be one possible answer. Since it’s 100KHz there could be timing related answers as well. Bob > Joe Gray > W5JG > <1.jpg><4.jpg>_______________________________________________ > 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. _______________________________________________ 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.