[Elecraft] Cal Fil possibilities in the K2

[Tom Hammond NØSS]

Peter:

>Since I now have all the options of interest in my K2, I want to make sure
>the filter calibrations are "correct", or at least as good as can be.  I have
>been experimenting with Spectrogram, following the approved documentation,
>but I still have problems.  It appears that there are two adjustments
>available for each filter position.  I can set the width and the BFO
>frequency.  But I seem to be missing something when it comes to setting
>the position of the dial frequency when I change modes.  Should a clean,
>centered CW signal remain centered in the bandpass when I switch from
>CW to CW Rev.?  I loose the signal completely and have to re-tune quite
>a bit to find the signal again.  Should it work this way, or do I have
>something badly out of adjustment?
>
>To put it another way, can I adjust the filter width, BFO frequency, and
>center frequency of each mode the way I want all at the same time?

First, YES, you should be able to switch from CW Norm to CW Rev with 
little, if any, change in the centered signal, and (usually) no more than a 
10-20 Hz frequency, if any at all... actually, it also depends upon how 
diligent you were in zero deating the other station.

Second... what you are experiencing is usually the result of having BOTH 
BFOs (CW Norm _and_ Rev) set to the SAME SIDE of the filter passband.

Check either the frequency of the BFO setting(s), OR you can also compare 
the 3-digit DAC steps. Both values can be obtained while you are IN CAL | 
FIL mode, and you can use either one with equal facility.

Assuming you are performing the Spectrogram alignment on a back LOWER than 
15M (I personally prefer 40M but anything between 160M and 17M should 
work), both the frequency and the DAC value should be BELOW the 
correseponding values for filter center if you are aligning CW NORMAL, and 
they should be ABOVE filter center if you are aligning CW REV.

Check and let me know what you find.

73 - Tom Hammond   N0SS