The 45 degree phase shift was a form of identification for WWVB and
also served as a marker for chart recorders. The shift occurred from
10-minutes past the hour until 15 minutes past the hour.
Before GPS came along, WWVB was my main frequency
standard/reference. I had two Gertsch RLF devices and a "thumper"
chart recorder. It was really a lot of grief trying to keep my
relatively poor crystal oscillators on frequency. If I was able to
see the 45-degree shift I felt as though I was really accomplishing
something. :] I now have two DATUM 9390-52054 GPS units. GPS has
really spoiled me!
Up until the phase shift was added I used a Symmetricom 8170, not so
much as a frequency reference, but as a clock in my shoppe. The 8170
is still running, but displays some strange combination of numbers
that actually tell me the status of it trying to set. I suppose I
should build a de-psk-er thingy, but I lost the paper work on how to
do it.The 8170 presently serves as a night lite.
Burt, K6OQK
At 08:36 AM 10/4/2020, someone wrote:
Now, there is a 45 degree (2.1 micro) modulation on the WWVB
signal, > that shows up as time-tags on the strip-chart, so it is
not trivially...
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
b...@att.net
K6OQK
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