http://elecraft.85.s1.nabble.com/K2-power-on-frequency-problem-tp6756612p6759644.html
after the decimal), then please provide that correction. Even 70 Hz is
After warmup, the spec drift should be less than 30 Hz. to be within
spec. Most are more stable than that. The 1/4 watt resistor on the
some experimentation. I would not recommend trying to alter the
> Don,
>
> This is my problem. I have 120Hz drift. I have been unable to
> correct it and I sent my K2 to you and others without results. Let
> me give you an example.
>
> I come into the shack in the morning, it is about 65 degrees. I turn
> on the rig. The display says 7000.004 Khz. I hit the band button and
> shift to 10Mhz WWV. I hit the "zero beat" button and it gives me a
> matching tone. I zero the main tuning knob, and it verifies that WWV
> reads out at 10000.004 Khz
>
> Now, I do nothing.
>
> I go back to 7000.004 Khz and I tune around the band looking for a
> CQ. If I don't find one in about 1/2 hour I go back to 10Mhz
> WWV. It now zeros at -3Hz ie. 9999.997 Khz.
>
> I adjust the zero on 40 meters to read 6999.997 KHz.
>
> Now I get lucky. I find a CQ, I crank up the power to 100 Watts and
> I call him. I'm not fooling around, we do a real rag chew and we
> talk for perhaps 30 minutes. As I notice him drifting, and my
> experience tells me that it isn't him drifting, it's me, I use the
> tone zero beat and I adjust the main tuning knob to maintain zero
> beat with my QSO. He stops drifting when my dial reads 7043.993
> KHz. Now the QSO ends and my K2 has stabilized. I return to 10MHz
> WWV and my dial reads 9999.993 KHz.
>
> Thanks,
>
> K6GC, TR
> K2/100 S/N 838
> ________________
>
> At 05:07 PM 9/4/2011 -0400, Don Wilhelm wrote:
>> John,
>>
>> You are reporting a shift of 128 Hz in one case, and 117 Hz in another
>> case. The difference between the two is close to 20 Hz which is the K2
>> BFO DAC limit, so that is not surprising, particularly if the BFO
>> voltage to the DAC is right on the "edge".
>>
>> Yet, I do not understand what approximately 120 Hz has to do with CW or
>> CWr - unless you have the K2 sitting close to an AC transformer, sine
>> 120 Hz is twice the 60 Hz line frequency and the shift is coming from
>> the VFO.
>>
>> You may have some inconsistency in addressing the EEPROM. If that is
>> the case, it will be cured by a Master Reset - BUT record all your menu
>> settings before doing the reset and restore them afterwards. The K2 A
>> to B Instructions contain nice tables for recording the menu values, and
>> I encourage you to download those instructions to record the menu
>> parameters.
>>
>> I would suggest you use the N6KR method to set the 4 MHz reference - the
>> precise setting may be slightly different than exactly 4 MHz, and the
>> N6KR method erases any variables other than your ability to tune WWV (or
>> any other "standard" station) with precision in SSB mode.
>> For the full K2 Dial Calibration procedure, see the article dealing with
>> that subject on my website www.w3fpr.com. If you only want to set the 4
>> MHz reference using the N6KR method and then run CAL PLL and CAL FIL,
>> you can refer to Wayne's document from the Elecraft reflector archives
>> of 8/20/03.
>>
>> Remember, setting the 4 MHz Reference Oscillator by itself does nothing
>> to the dial calibration, one must run CAL PLL and CAL FIL to set the new
>> values (based on the new setting of the Reference) into EEPROM before
>> any chance in tuning is made.
>>
>> 73,
>> Don W3FPR
>>
>> On 9/3/2011 9:24 AM, John Oppenheimer wrote:
>>> I am a new K2 (#7212) user. I have been baffled by what I thought was my
>>> inability to properly perform the frequency alignments. My last attempt
>>> was to perform a factory reset and re-do PLL and BFO (Table 8-1 values)
>>> calibrations.
>>>
>>> I believe that I have found the issue, sometimes it appears that the VFO
>>> frequency offset look-up tables are not used and a toggle through two
>>> "CW REV" changes are needed.
>>>
>>> Used a K3 CWT SPOT as a 4MHz monitor to adjust C22.
>>>
>>> Using a K3, CWT, SPOT and K2 in in TUNE (with dummy load) to measure the
>>> K2's frequency. Test process is:
>>>
>>> Note: only the events in the below text were performed.
>>>
>>> Power off K2 with F set to 7026.00
>>> Power on: K2 F=7026.00 K3 F = 7026.146
>>> "CW REV" "CW REV", K3 F = 7026.018
>>> Power off K2
>>> Power on K2 F=7026.00, K3 F = 7026.025
>>> Power off K2
>>> Power on K2, Move K2 F to 7027.00, K3 F = 2027.028
>>> Power off K2
>>> Power on K2 F = 7027.00, K3 F = 2027.145
>>> "CW REV" "CW REV", K3 F = 7027.000
>>>
>>> I was listening to the audio during the above process. There was a
>>> notable change in the resulting pass-band audio when the "CW REV" "CW
>>> REV" toggle was performed and the K2 frequency changed. Leading me to
>>> believe that the VFO offset frequency was changed.
>>>
>>> Though I can't find a reproducible process, I have found events where
>>> during a K2 power on session, sometimes a "CW REV" "CW REV" is needed to
>>> acquire correct K2 frequency.
>>>
>>> Is this normal K2 operation, or do I have an issue with this K2?
>>>
>>> John, KN5L
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