Hi,
Many modern counters use this trick too, but much more gift-wrapped, in
that they themselves shift their oscillator to measure the shift and
hence figure out which overtone is being used and hence derive the
correct frequency. With HP5245 etc you had to do a little work on your
own for post-processing. The same basic trick is also fundamental to
frequency comb measurement of optical frequencies.
Heterodyning remains one of several approaches to design high frequency
counters.
Cheers,
Magnus
On 06/08/2017 02:35 PM, Scott McGrath 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 <[email protected]> wrote:
such
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