[time-nuts] Vintage Frequency Measurement

[Robert Atkinson]

In a word,Wavemeters. Classic US onwas the BC221 with built in 100kHz crystal calibrator
http://radionerds.com/index.php/BC-221
British was the "Class D"http://www.royalsignals.org.uk/photos/classDno1.htm

For UHF and Microwave it was Lecher lines or cavity wavemeters.
Robert G8RPI.


      From: Scott Stobbe <scott.j.stobbe at gmail.com>
 To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Sunday, 12 February 2017, 6:08
 Subject: [time-nuts] Vintage Frequency Measurement
   
I was inspired recently coming across a Lampkin 105 frequency meter, as to
how  frequency measurement was done before counters.

Certainly zero-beating a dial calibrated oscillator, would be one approach.

Is there a standout methodology or instrument predating counters?
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