Don (and others) WWV provides a BCD subcarrier at 100Hz that is always present. Using HRD's PSK31 (it's free; thanks Simon!) it is a simple matter to adjust the tuning to the proper frequency.
On Mon, 24 Apr 2006 10:01:19 -0400, "Don Wilhelm" <[EMAIL PROTECTED]> wrote: >Thanks for posting this Tom. It has since been written as an application >note and is available on the Elecraft website in .pdf format - see >http://www.elecraft.com/Apps/K2%20C22%20Adjust%20App%20Note.pdf > >I have only one thing to add and that is for us 'tone-deaf' folks tuning WWV >precisely may be difficult (and the procedure does depend on precisely >tuning WWV or other reference frequency) - I can get close by listening to >the voice, but I may be as much as 100 Hz off. > >I connect the computer running Spectrogram and listen to the transmitted >tones - WWV transmits 500 and 600 Hz tones on alternate minutes, and I look >for these tones displayed on the Spectrogram screen - I set markers at 500 >Hz and 600 Hz - then adjust the tuning until the tones line up with the >markers. It is easy to get within 10 Hz this way. > >Another way is to use the SPOT to provide a reference tone - set the >sidetone pitch at 500 or 600 Hz and tune the WWV tone for zero-beat with the >SPOT tone. Of course, if you zero with the 500 Hz tone thinking it was the >600 Hz one, you will be 100 Hz off, but listening for a short while will >quickly indicate this error. > >There are other accurate ways of setting the 4 MHz master oscillator, and >some are contained in the K2 Dial Calibration article on my website >http://w3fpr.qrprqdio.com _______________________________________________ Elecraft mailing list Post to: Elecraft@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
