On June 8, 2017 at 8:35 AM Scott McGrath <scmcgrath@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.k9si@gmail.com> wrote:

     such

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And there was the HP 540 and the HP 2590B... I still use a HP 2590B for frequency measurement and in conjunction with a HP 851B display as a spectrum analyzer. John WA4WDL > > On June 8, 2017 at 8:35 AM Scott McGrath <scmcgrath@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.k9si@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. > > > > >