[time-nuts] Reference oscillator accuracy

[J. Forster]

It's been a while since I was using an HP 117A, but from memory the
diurnal shift in Boston was a good part of a 1 cycle of 60 KHz or roughly
16 uS. To get good data, I'd have to run the stripchart for 24 hours (to
make sure track was not lost) and compsare readings at the same time each
day.

LORAN was MUCH easier.

FWIW,

-John

=================


>
>> The ground wave path of WWVB varies due to a very small changes in the
>> index of refraction (temperature and absolute humidity) over the path.
>> It is not much, but is measurable.
>
> How much is "not much"?  Say over a 1000 km path.  Are we talking
> microseconds or picoseconds?
>
>
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