I live about 600 miles away from WWVB also (in Idaho). My wristwatch WWVB receiver also only tries at night. If I force it to try during the day, it is hit or miss. I can only assume that my wristwatch radio has marginal sensitivity, at best, for good 60kHz reception. Well, it¡¯s a radio stuffed into a tiny wristwatch package, so that¡¯s not surprising. :) I also have a wall clock that receives WWVB but I don¡¯t know when it tries to sync and the seconds are always right on (I¡¯ve never had to mess with it).
A company called Canaduino still sells a WWVB receiver module. You can find them on Amazon for about $13 or so. Or, some people have luck harvesting the module out of cheap used clocks if you know what to look for.
You would have to hook up the Canaduino module to a Arduino or similar to try and decode the WWVB signal into a 1 PPS. I don¡¯t think you¡¯ll get it directly from the module. And I¡¯m not so sure it would be accurate enough to use for calibration (like a GOS 1 PPS pulse) but maybe?
73, Gregg
