[Elecraft] Frequency Shift

[Don Wilhelm]

Tom Hammond caught my 'too quick response'  I should have typed CAL FIL 
below - not CAL PLL.

Sorry all and thanks to Tom for noticing.

73,
Don W3FPR

Don Wilhelm wrote:
> 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.
>>
>>   
>