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

[Tom Van Baak]

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