I also have two of these La Crosse Ultratomic BPSK WWVB clocks. Upon
installation of two "C" cells, both clocks synchronized to WWVB within 5
minutes.
I tested this several times with the clocks in various locations well
inside my home; that is significant because after installation of
radiant barrier thermal roof insulation none of my AM "atomic" clocks
would synchronize even overnight until I moved them to (the inside of)
outside walls.
The claim is that the BPSK demodulation is 100 times more sensitive than
AM; it is at least enough more sensitive to work quickly any time of day
here in southern California. I consider that a great improvement and am
disappointed no other BPSK clock products have appeared.
One of the two Ultratomic clocks' second hand is perhaps 1/4 of a hand
width off the marked ticks but I have not found that too awful; the
other clock hands seem right on.
I was unaware of the "greatbigoutlet" eBay seller but I see they have a
very extensive store of La Crosse products so it is likely a company
store. The prices and free shipping make it attractive.
I also have two Heathkit Most Accurate WWV clocks and a Tindie Geppetto
Electronics GPS Clock. Even at 8X slow-motion video, it is interesting
to see the tenth-second digits on all these clocks roll over at the same
visual instant! An old line-powered LED digital clock now looses or
gains as much as 20 seconds a week as the power companies no longer
maintain accuracy of the 60 Hz line frequency.
I have posted the 8X-speed video showing the several clocks on the
HeathkitClocks Group website in my personal Files Album. You do need to
be a member of that Group to access that Files Album.
Larry
On 8/20/2020 9:27 PM, Mike Feher wrote:
So far I have only put batteries into one of them Tom and I agree with you. It
is ever so slightly off. However, it is so small it is barely visible on the
minute hand. The second hand seems right on. To use as is, as a clock, it is
more than fine for my 75 year old eyes 😊 . Nice hearing from you. It has
probably been about 20 years since you got those HP journals from me and I got
some nixies from you. I am no longer concerned about picoseconds as days and
years go by way too fast. Stay Healthy - Regards - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115...
--
Best wishes,
Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
--
Best wishes,
Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)
_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
