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

[paul swed]

Burt
Yes this has been looked at before by time-nuts and as you say it shifts.
Its also documented by nist and unfortunately the AM code is nothing like
the new psk code for a good reason. Better noise immunity and other things
also documented. Its complex at least for me. Overall I get it but when I
get to the error correction and disassembly of the message format its not
so clear. Though perhaps it would be if I were building a psk decoder and
that may happen later but only after the d-psk-r is really pretty complete.
A by product of the d-psk-r is the psk code so its there for the taking.
Regards
Paul
WB8TSL


On Fri, Jun 14, 2013 at 8:13 PM, Burt I. Weiner <biwa at att.net> wrote:

> 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<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
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