http://elecraft.85.s1.nabble.com/Need-help-for-sick-K1-tp389102p389114.html
WWV provides a BCD subcarrier at 100Hz that is always present. Using
>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
>
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