[Elecraft] K2 Calibration using WWV

[Nick Waterman]

Darrell Bellerive wrote:
> Please expand on this. I have never used a PSK application, but how would it 
> detect the subcarrier is exactly at 100 Hz? I suspect the software is using 
> the soundcard clock as a reference and that wouldn't necessarily be very 
> accurate.

... but it'll be within a few percent, surely, and that means you'll be
within a few hertz of 100Hz? The K2 tuning steps are likely to be a lot
bigger than that?

> Seems that the K2 can be set very exactly using Wayne's method 
> (http://www.elecraft.com/Apps/K2%20C22%20Adjust%20App%20Note.pdf) but it 
> requires properly zero beating WWV.

It'll still be only within about 30Hz, won't it?

> Wayne suggests just listening for zero beat, one should be able to get within 
> about 15 Hz.

... which I'd have thought is well within the soundcard clock accuracy too.

> What tricks have others on the list found to tune WWV to within 1 Hz or less 
> without expensive professionally calibrated test equipment?

I think you'll find day-to-day temperature variation, and
capacitative/inductive effects of nearby objects probably cause more
variation than that   :-)

-- 
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
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Confucius say: Man who fight with wife all day, get no piece at night