[Test-Equipment] Frequency Measuring Test

[Gary Chatters]

>
>I do not believe that propagation delays will cause frequency measurement
>errors. Unless we are talking about something like doppler. Plain delay
>should have no effect. It will however have an effect on any time related

Of course, delays are not going to cause errors.  The problem is in
the variations of the delay.  Those with GPS based standards might
find it interesting to measure WWV.

I made a fairly simple set up for comparing frequency to WWV.
A Racal 6790/GM tuned to 10MHz with its BFO offset by 60Hz is
fed to an oscilloscope set to line triggering.  The trace would
be fairly steady for only a few seconds before the ionosphere
started shifting and the sine wave trace started racing across
the screen in one direction or the other.

Gary