[time-nuts] Spectracom 8161 "Standard Frequency Receiver - Oscillator" for WWVB (and question...)

[Hal Murray]

>  On a WWVB setup you get 10’s of us ( yes microseconds) of movement at
> sunrise and sunset. You get as much as 10us between day and night. 

Somehow, I was thinking that WWVB was ground wave and wouldn't be effected by 
changes in the height of the ionosphere.  Am I totally out of it, or is 10s of 
uSec just a lot better than the day/night shift you get with WWV?

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