Hi Also consider that the filter is *very* old. The logo is probably from >50 years ago. That makes the gizmo a “tube era” sort of part. CTS bought Knights in 1964 and the logo changed after that.
The part in the picture is serial number two. There may not have been very many gizmos that used that filter. Bob > On Mar 6, 2016, at 4:17 PM, Magnus Danielson <[email protected]> > wrote: > > Hi again Joe, > > As I read it, it's a 100 kHz 10 Hz BW filter. Very narrow. > > Cheers, > Magnus > > On 03/06/2016 08:31 PM, Joseph Gray 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? >> >> >> Joe Gray >> W5JG >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
