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.
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