[Elecraft] Calibration with CHU via Spectrogram Software

[Tom Hammond NØSS]

jIM:

>Tnx for the advice. Yes, I can use a freq counter but I'm afraid that
>connecting a probe will pull the freq. Can also listen for the 4.000 MHz on a
>receiver but then its only as accurate as that receiver.  Perhaps this is
>good enough but people are talking about accuracy within 30 Hz or so. I'd
>like to use the method that has the best accuracy.

The method I use is to connect the K2's FCTR probe AND my counter 
(simultaneously) to TP3. Then, I merely crank of C22 until the K2 display 
reads the same as that of the external counter.

A final CAL PLL (with the FCRT probe now in TP2) and I'm done.

>Seems like fine-tuning to atomic clock accuracy at least theoretically is 
>the way to go.

Probably so, but that's gilding the lilly, esp. since the K2's frequency 
stability is not adequate to hold that accuracy more than a short while. 
You'd need a REALLY TCXO to even come close to approaching that level or 
accuracy over an extended period of time

>Has anyone had good results with the CHU method?

Unfortunately, I've not yet tried the CHU/WWV method.

73,

Tom Hammond   N0SS