[time-nuts] UltrAtomic Clock

Larry McDavid lmcdavid at lmceng.com
Thu Apr 6 18:38:43 EDT 2017

When I got home after my Thursday Lunch meeting today, my new La Crosse 
404-1235UA-SS UltrAtomic clock was waiting. I unpacked it and installed 
two (of 4 possible) C-cells and set it on the floor upstairs near the 
center of my home, fully under the radiant barrier insulation that has 
foiled (that's a pun!) all my previous "Atomic" clocks. The hands moved 
around 4 hours and stopped. I left.

Returning about an hour later, the clock had set itself correctly!

I verified the displayed time against my (Tindie) GPS Clock and the 
seconds and seconds-tick match as closely as I can determine visually.

It's very unusual for these WWVB clocks to set during daylight. 
Normally, the 60 KHz WWVB reception during daylight hours is very poor 
indeed here on the west coast. These "atomic" clocks normally set to 
WWVB time in the several hours after midnight.

That this new BPSK phase-shift modulation allowed reception under poor 
conditions is a big plus, especially for those with radiant barrier 
insulation and those who live on the east coast where the WWVB signal is 

If you want to shop for this new clock, check Amazon for price:


Better specs are on the La Crosse website here:


It's kinda big, but I surely won't have any trouble reading it across a 

Best wishes,

Larry McDavid W6FUB
Anaheim, California  (SE of Los Angeles, near Disneyland)

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