[time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

[Hal Murray]

kb8tq at n1k.org said:
> To get the accuracy into the 1 ms range on WWV, you would need a pretty good
> idea of the path length between you and WWV. 

Dave  Mills has a program to compute delays.

 * By default it prints out a summer (F2 average virtual height 350 km) and
 * winter (F2 average virtual height 250 km) number.  The results will be
 * quite approximate but are about as good as you can do with HF time anyway.
 * You might pick a number between the values to use, or use the summer
 * value in the summer and switch to the winter value when the static
 * above 10 MHz starts to drop off in the fall.  You can also use the
 * -h switch if you want to specify your own virtual height.

What's the height difference between night and day?

This was google's first response.
  https://opensource.apple.com/source/ntp/ntp-136/clockstuff/propdelay.c


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