[Elecraft] K2 drift

[Don Wilhelm]

Bernie,

Again, I ask - does the audio pitch change when the signal is centered 
in the CW filter?
If that changes, then the problem is with the BFO.
If the audio pitch is the same at the filter center, the the shift is 
due to the PLL/VCO.

73,
Don W3FPR

On 4/12/2015 12:46 AM, Bernie KF0QS wrote:
> It only shifted that far with regard to the cw filters.
>
> On QSO's, it's only noticeable on long QSO's apparently.  I've never
> noticed it myself, but I've had two hams point it out to me, both
> during long QSO's.
>
> At 04:59 PM 4/11/2015, vk2rq [via Elecraft] wrote:
>> You say it is shifting by as much as 1kHz? That is definitely not
>> normal. My K2 built last year will only drift by around 20Hz or so
>> as it warms up, it is pretty stable. The BFO inductor is L33, the
>> pre-wound one that sits on a rubber bumper. Wasn't there a thread
>> some time last year where someone was having problems with BFO
>> frequency stability, and it turned out there was some contaminant on
>> the rubber bumper that was making it conductive? 73, Matt VK2RQ
>>> On 12 Apr 2015, at 1:13 am, Bernie KF0QS <[hidden email]>
>> wrote: > > Dear OM's and YL's: > > Twice, I've had people tell me
>> my K2 (which I've had on the air for over 3 > years) drifts a bit
>> in frequency.  Both times have occurred during long > QSO's so it
>> appears to be a slight drift. > > This phenomenon may also explain
>> something else that happens.  Whenever I > set up the filter
>> settings, they work well for a while.  After a while, the > sweet
>> spot (i.e., the point at which the heard signal is in the middle
>> of > the filter bandpass) seems to migrate eventually to about 1khz
>> below > wherever I set it (at least that's where I have to move the
>> RIT to hear the > signal when I switch in the filters).   > > Is
>> there a common fix for both these problems, or am I experiencing
>> two > different things.  Any help you can give would be
>> appreciated. > > 73 de Bernie, KF0QS > > > > -- > View this message
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