[Elecraft] [K2] Frequency Calibration using WWV Audio Tones

[Steve Kavanagh]

I was wondering if anyone had tried doing the reference oscillator frequency calibration for a K2 without the rather troublesome step of accurate zero-beating by feeding the 500/600 Hz audio tones from WWV/WWVH to a computer sound card or smart phone spectrum analyzer, or similar program?  It's pretty easy to read these audio frequencies out to a precision of 1 Hz or so using Spectran or Spectrogram, for example. 

Right now, I'm seeing both WWV and WWVH tones (at the same time!) on my computer screen (within a few Hz of the correct audio frequencies), with the K2 tuned to 15000.24 kHz, so it really ought to be re-calibrated.

Are there any issues with this option, before I start into the whole process? 

73,
Steve VE3SMA