>        My general coverage receiver only goes down to 100 KHZ, but I
>can assure you that it is a jungle down there.  There is all kinds of
>man-made and natural racket that probably does a great job of screwing
>up any kind of VLF receiver that doesn't do a good job of checking to
>see if it is receiving junk or WWVB.

The very low data rate means you can have a very narrow bandpass receiver, I
suspect many of these are done using a digital phase lock loop, to retrieve
the signal out of the noise. Then using its own oscillator to drive the
clock during signal dropout, and resynchronising as and when good signals
are available makes for an "accurate enough" and self correcting clock.

I want to know what happens to the radio clocks that have the conventional
hands, when switching DST off and on. Do the hands suddenly do a full
revolution rapidly?

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