I just uploaded a video to YouTube of my scope display. Others have
also made similar videos. You can see it
at: http://www.youtube.com/watch?v=um8HxRHkkKw Pardon the fan noise.
Burt, K6OQK
Gang,
I took a look at the WWVB signal using a 1:1 Lissajou signal the same
way I do for the FMT's. Using a 10:1 scope probe I sampled off the
output of the pre-amp in the 8170 and fed it into a HP-3586B tuned to
60 kHz and compared the resultant I.F. against a HP-3336A tuned to
the 15625 I.F. Both the 3586B and the 3336A are GPS locked. I won't
go into the nitty gritties of how I do this, but f anyone's
interested they can see my FMT Methodology at:
http://www.k5cm.com/k6OQK%20FMT%20NEW.htm
What I saw was the phase of the WWVB signal shifting back and forth
180 Degrees coincident with the dips in the carrier. Coincidentally,
this is what all of you have been telling me, but, just the same, it
was interesting to watch. The duration of each shift obviously are a
form of zeros, ones and place holder. I'm wondering if the code used
to shift the phase is the same code as carried in the legacy system
where the duration of the carrier dips corresponds to the ones and
zeros, and the place holder.
Burt, K6OQK
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
www.biwa.cc
K6OQK
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