Posted by
Rick Kunath on
Jan 02, 2008; 7:57pm
URL: http://elecraft.85.s1.nabble.com/K3-question-problem-tp457849p457853.html
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
> -
<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
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com