[time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology
Hal Murray
hmurray at megapathdsl.net
Thu Dec 7 22:49:44 EST 2017
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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