K6OQK FMT Methodology - WWV 15 MHz & 2.5 MHz Comparison




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Published on Jul 13, 2016

The purpose of this video is to demonstrate what I like to call the "I.F. Lissajous Pattern Method" that I use for absurdly accurate off-air frequency measurements and how it displays the effects of propagation and Doppler shift.

Shown is a comparison of WWV at 15 MHz and WWV at 2.5 MHz as it was received at my location on 7-13-2016 at about 5 PM PDT. The receiver is a HP-3586B and the I.F. comparison signal is from a HP-3336A. Both are GPS referenced by way of a DATUM 9390-52054 Time & Frequency receiver. At the time these measurements were made the 10 MHz reference frequency error was 0001E-12.

You can see the basic settings of the equipment, but watch the scope display in the upper left of the video. Note that at times the 15 MHz signal will appear to stand still and will sometimes reverse phase rotation direction. At 1 minute into the video I switch from WWV at 15 MHz to WWV at 2.5 MHz. I would have used WWV at 10 MHz but my standards tend to wipe it out at this time of the day.

For specific details of how the measurements shown here were made, please visit the K6OQK FMT Methodology page at: http://www.k5cm.com/k6oqk%20fmt%20new...

Thanks for watching.

Burt, K6OQK


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