[Elecraft] Frequency Shift

[Don Wilhelm]

Dave,

A BFO shift of up to 20 Hz is to be expected. 
If you have 100 Hz shifts, then you need to run CAL PLL again - using 
Spectrogram if possible.  Note that you should use a broadband noise 
source or band noise (with the preamp on) with no signals present.  
Attempting to set the BFOs with a signal present in the passband will 
result in frustration.

See my article on K2 Dial Calibration at my website www.qsl.net/w3fpr 
for additional information.

73,
Don W3FPR

David Robertson wrote:
> Hi All,
>
> I am the owner of 2 K2s, one a K2-100 and the other a qrp model. I built one of the rigs myself but completely aligned both rigs.
>
> My question.
> What can I do to prevent slight frequency shifts when changing filter settings?
> Both rigs exhibit this problem. The shift is only about 100 hz at the most but I don't think this should happen.
>
> Other then the small shifting problem the rigs work perfectly.
>
> I know there has been solutions posted on this forum in the past but I seem to not have the ability to search for them.
>
> I am using the spectrograph program and following the procedure that accompanied it when downloaded.
>
> I must be doing something wrong. It must not be the radios as both exhibit the frequency shift when changing filter bandwidths.
> Any help or advise would be appreciated.
>
>