Hi Craig.
> We have a total of 8 "automatic" WWV synched clocks of various types...
>....
> And I live 30 miles from the WWV transmitter.
Incidentially, it is _WWVB_ on 60 kHz, not WWV or WWVH on HF that is used by
these "radio controlled clocks" for periodic time checks, usually once a day
during the early morning hours (local time).
Despite your short distance to WWVB, you still might be experiencing poor
reception due to local interference sources. Computer monitors, switching
power supplies, AC operated motors, and thunderstorms tend to generate a
lot of 60 kHz noise.
All three NIST stations transmit DST, leap year, UT1, and leap second
information bits.
With regard to DST flags transmitted by WWVB, NIST Publication 432 states:
"Daylight saving time (DST) and standard time (ST) information is
transmitted at seconds 57 and 58. When ST is in effect, bits 57 and 58
are set to 0. When DST is in effect, bits 57 and 58 are set to 1. On the
day of a change from ST to DST bit 57 changes from 0 to 1 at 0000 UTC,
and bit 58 changes from 0 to 1 exactly 24 hours later. On the day of a
change from DST back to ST bit 57 changes from 1 to 0 at 0000 UTC, and bit
58 changes from 1 to 0 exactly 24 hours later."
With this in mind, poor or inconsistant reception might explain some of the
effects you've recently seen.
I'm 1622 miles east of WWVB and own a WWVB-based frequency standard / UTC clock
of my own design. Even at this distance, when proper receiving techniques are
used, reception of WWVB is generally excellent, day or night.
73, de John, KD2BD
Visit John on the Web at:
http://kd2bd.ham.org/
.
.
.
.
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