I would like to thank all who responded to my question about frequency shift
during filter bandwidth changes on my K2 (see below).
It appears that the shift is no larger then 20 HZ so I guess everything is
normal.
Thanks again and happy holidays to all.
Dave KD1NA
I am the owner of 2 K2s,
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
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
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
Tim,
That certainly sounds like a bad solder connection or an unsoldered one to me.
Look in the BFO area first if it effects the filter passband, otherwise the VCO
area is another possible candidate for suspicion. Yes, even in something that
has been working for almost 6 years, an unsoldered
For awhile, I've been experiencing a down shift of about 200 hertz, but
rarely and randomly in my K2 serial 0063. It's enough to change the
characteristic tone in the receiver and degrades from the filter settings.
Any suggestions as to where to start looking? Doesn't seem to be
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