[Elecraft] K2: Help, I messed up the dial calibration!!!

[Steve Kallal]

Don,

Sorry I didn't fully read your comments before my first reply.

Could you briefly explain how you calibrate with the 500 & 600 Hz 
markers? Can it be done in real time while tweaking C22? I can't do it. 
I have C22 set exactly to 4 MHz via the 20 MHz WWV method, with a 
perfect zero beat. Yet, I am about 40 Hz off on WWV 10 MHz. Apparently 
there is more than setting the clock to exactly 4 MHz followed by CAL 
PLL/CAL FIL.

If you have some canned document of the 500/600 Hz tones Spectogram 
method , let me know.

73,

Steve N6VL
K2/100 #2289

Don Wilhelm wrote:
> Steve,
>
> Your steps are correct.
>
> It sounds like you are off by the amount of your sidetone pitch.
> Were you receiving WWV in LSB or USB mode?  If you used CW mode, that 
> would explain the difference.
>
> Are you quite certain that you tuned WWV accurately?   Do not 'set the 
> dial at 10,000.00', but instead, ignore the dial and tune until WWV is 
> received correctly.  I use Spectrogram for that with markers 
> (pointers) set at 500 and 600 Hz for that.   When correctly tuned, you 
> will see the tones alternate each minute from 500 to 600 Hz (yes, I 
> know there are no-tone minutes, and one minute shortly after the hour 
> is 440 Hz, but mostly they alternated between 500 and 600 Hz.).
>
> When done correctly (mostly tuning WWV accurately), you results will 
> be within 20 Hz of WWV.  One cannot expect much better than that due 
> to the DAC resolution used in the K2.  I do this most every day, and 
> it has become 'old hat' to me - use Spectrogram to verify the correct 
> tuning - ignore the K2 dial display until the last verification step.
>
> 73,
> Don W3FPR
>
>
>
> Steve Kallal wrote:
>> I was trying to calibrate my K2/100 and had it within 10 Hz according 
>> to WWV 10 MHz. I should have left it alone. Now it is off by about 
>> 700 to 800 Hz on 40 meters. Ouch!
>>
>> Here are the steps I did so far:
>>
>> 1. I set the C22 trimmer on the Control Board by the N6KR method at 
>> http://w3fpr.qrpradio.com/n6kr_method.htm. I set the dial at exactly 
>> 10.000.00 MHz, and alternated between TP1 & TP2 until the readings 
>> CAL FCTR match with about 2 Hz.
>>
>> 2. I ran CAL PLL.
>>
>> 3. I ran CAL FIL on every mode / filter combination, being sure to 
>> change the BFO hex value even if not needed.
>>
>> I didn't build the K2 in the first place. So I never did the entire 
>> procedure before.
>>
>> Any help is welcome!
>>
>>
>