[Elecraft] k2 receiver shift problem fixed, now tx shift problem

[Don Wilhelm]

Luca,

The transmit offset should work correctly - it is automatic in the K2, 
the offset is computed by the firmware.  To be off by the amount of the 
sidetone is unusual.  The usual situation is when the transmit frequency 
error is two times the sidetone pitch, and that is caused by having the 
passband on the wrong sideband.

How are you determining that the transmit frequency is shifted?  The K2 
displays the carrier frequency, and some others may display the tone 
frequency.  If you are measuring the K2 output with another receiver, 
that is something to be concerned about because you may not be able to 
depend depend on the dial reading of the other receiver.

If you have not calibrated your K2 dial (see the K2 Dial Calibration 
article on my website www.w3fpr.com), then you cannot depend on the K2 
dial reading either.

To check the transmit frequency using another receiver, use the 
following method - which ignores the precise dial reading on both the K2 
and the other receiver by matching two signals..
1) Tune the signal source on the K2 so the pitch matches your 600 Hz 
sidetone pitch.
2) Tune the same source on the other receiver.
3) Now use the K2 to transmit into a dummy load - the other receiver 
should hear the K2 at the same frequency and pitch as the signal source 
was heard on that receiver.

73,
Don W3FPR

uniroma wrote:
> Don
> thanks for your quick reply.
> May be I did'nt get something.
> To avoid mistakes, I adjusted the sidetone pitch to 600hz than I applied 
> exactly the manual procedure setting the suggested filter bandwiths and bfo 
> values. Actuallly the receiver frequency is fine centered for all filters.
> If the manual suggested values  don't work well in tx mode, which is the 
> right value to apply?
> And, if I change again the bfo values, does the rx freq shift again?
> luca
>   
>