[Elecraft] Frequency counters for Alignment

[Don Wilhelm]

Ken and all,

What you say is true - but you can detect the transmitted tones sent by WWV
with great accuracy.  See http://tf.nist.gov/stations/iform.html#stdf for
innformation about what tones are transmitted at what times.

With the audio of a SSB receiver fed into the computer soundcard, and the
computer running a program like Spectrogram, one can align the received
tones with properly set Spectrogram markers and when the transmitted tones
line up with the received tones, you can be certain that WWV is tuned
precisely.  This is actually more accurate than trying to listen for the
carrier at zero frequency - neither the receiver audio nor the human ear can
respond to zero frequency, and attempt to do so may be off by +/-30 Hz or
more - detecting the tones with a graphic display will allow you to tune
within a few Hz.

73,
Don W3FPR

> -----Original Message-----
>
> A word of caution ...
>
> The zero beating to WWV should be done during a silent period
> so as to avoid zeroing to the tone-modulated carrier.
>
> If you are receiving a network ... as opposed to a local ... TV
> program, the 3579.5454 NTSC color burst signal from your TV
> will very accurate.  It's locked to the network's frequency standard,
> which is in turn locked to the NBS standard in Boulder.
>
> 73! Ken Kopp - K0PP
> k0pp at arrl.net
> or
> k0pp at ixpres.com
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> 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.htm
> Elecraft web page: http://www.elecraft.com
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.5/706 - Release Date:
> 2/28/2007 4:09 PM
>
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 268.18.5/706 - Release Date: 2/28/2007
4:09 PM