David Wilburn wrote:
I have had a great deal up success using Spectrogram as Don describes.
This page is very helpful for understanding what goes on, minute by
minute, with the WWV signal.
http://tf.nist.gov/stations/iform.html
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<Snipped>
I consider the above method more accurate than using a frequency counter
of unknown calibration. Of course the audible zero-beat method works
fine too, but there is always the possibility of confusion about whether
one is zeroing the carrier or one of the transmitted tones. The warning
about being certain you are zeroing the carrier goes back to the days
when we were calibrating our secondary frequency standards - one must
wait for a silent minute to be certain we zero the carrier.
This is assuming that the sampling rate (or re-sampling error rate)
error in the sound card has been properly measured and a correction
factor entered into the audio spectrum analyzer application.
Rick Kunath, k9ao
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