Hi The heterodyne approach dates back at least into the 1930’s in general lab use. I’m sure it dates well before that on an experimental basis. The LM and BC-221 frequency meters are good examples of it’s use. Adding an “error multiplier” to the setup could give you a very impressive resolution. Accuracy (or course) still deepened on what you had as a standard driving the error multiplier.
Bob > On Jun 8, 2017, at 8:35 AM, Scott McGrath <scmcgr...@gmail.com> wrote: > > The heterodyne trick has been done before the first > 'Modern' frequency counter the HP 5245 used plug ins to extend its range to > 18 Ghz by doing exactly that. The plug in contained a tunable LO mixer and > indicator to show tuning lock > > These were a pain to use but they beat the 'frequency meters' by a mile > > Content by Scott > Typos by Siri > >> On Apr 26, 2017, at 2:52 PM, al wolfe <alw.k...@gmail.com> wrote: >> >> such > _______________________________________________ > 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.
