[time-nuts] Frequency subtraction with D-flip flops

Tom Van Baak tvb at LeapSecond.com
Tue Jun 25 10:39:05 UTC 2013


Thanks, Bruce, for that wonderful phase meter patent reference. Very interesting.

BTW, if any of you are wondering why the patent mentions comparing 10.23 MHz (GPS) with a "very accurate" 13.4 MHz, the following paper explains that our favorite cesium frequency 9192.631770 MHz / 686 = 13.400... MHz:
http://www.pttimeeting.org/archivemeetings/1992papers/Vol%2024_20.pdf

/tvb




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