[Elecraft] Calibration with CHU via Spectrogram Software

[JimWMiller@aol.com]

> 
> Jim, WA2UMP wrote:
> 
> "It's time to calibrate the frequency against CHU on 7.335 MHz."
> ==========
> If you don't have a frequency counter, the best way to calibrate the 4
> MHz oscillator on the control board is to use your station receiver and
> adjust C22 on the control board so that the oscillator is at 4000.000 kHz
> as monitored on your station receiver.
> 
> Although C22 can be adjusted (along with CAL PLL) to calibrate the VFO
> dial, this is NOT the recommended method of setting the 4 MHz oscillator.
> If the oscillator is not exactly at 4000.000 kHz, the K2's built-in
> frequency counter will not be accurate.
> 
> Adjust it the proper way and accept whatever slight VFO error which might
> exist.  Because of the drift of the PLL REF and BFO oscillators, the VFO
> dial error will vary with temperature anyway.
> 
> 73, de Earl, K6SE
> ========================
> 
Hi Earl,
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.  Seems like fine-tuning to 
atomic clock accuracy at least theoretically is the way to go.  
Has anyone had good results with the CHU method?
73, Jim WA2UMP
K2: 2679


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