[Elecraft] [K2] Secret to K2 calibration programming?

[Don Wilhelm]

Mike,

First there is up to a +/- 20 Hz tolerance that can be attributed to the 
K2 DAC, so "dead nuts on" may not actually be achievable, but you can 
get close.  First question is - what are you using for a reference?  How 
much do you trust its frequency accuracy?  That is one potential source 
of error.

Secondly, you are reporting discrepancies up to 500 Hz, and that is more 
than is to be expected after doing the K2 dial calibration.

I suggest you go to my website www.w3fpr.com and look at the article 
dealing with K2 Dial Calibration.  Follow the 3 steps mentioned in that 
article, and then re-check the calibration.  The 4 MHz reference 
oscillator must be set before any other step.  Use the N6KR method when 
setting the reference, and I highly recommend observing the WWV 
transmitted tones with Spectrogram to determine the correct tuning of 
WWV.  Accuracy in setting the reference is critical to the result - 
allow your K2 to warm up for an hour or more before attempting to set 
the 4 MHz reference.

73,
Don W3FPR

Mike-WE0H wrote:
> OK, here the deal. My K2 S/N 6698 doesn't have the same freq offset on 
> all the bands. How can I program that so it is dead nuts on every band? 
> Here's the freq measurement spots and what the radio is showing as a 
> center freq using Spectrogram.
>
> Signal freq then radio's displayed freq...
> 1.90000   1.90003
> 3.90000   3.90003
> 5.50000   5.50003
> 7.20000   7.20003
> 10.1000   10.1004
> 14.2000   14.2005
> 18.5000   18.5005
> 21.2000   21.2000
> 24.9000   24.9001
> 28.2000   28.2001
>
>
> See how it is not the same offset across the bands? Something funny is 
> going on here...
>
> Thanks for the help.
>
>   
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