[time-nuts] Fwd: Re: WWVB SDR discussion

[Larry McDavid]

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)