[time-nuts] Spectracom 8170 grief... Watching the problem...

Burt I. Weiner biwa at att.net
Sat Jun 15 14:34:38 EDT 2013


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.
biwa at att.net
www.biwa.cc
K6OQK 



More information about the time-nuts mailing list