[Elecraft] K2 Filter Alignment: USB vs. LSB, CW vs. CW-Rev

[Linden, Mike (BRC-Hes)]

  Once I get to the Stage III alignment on my K2, I plan on using
Spectrogram to align the CW and SSB filters/BFOs. It seems that proper
filter alignment is a juggling act between the following:

1) Proper centering of the signal within the filter's passband: For the most
part, CW should be aligned in the center or the largest peak, SSB should be
aligned for best audio quality (usually with the bottom at about 300Hz).

2) Constant pitch across the different bandwidth filters for a given mode.
In other words, you should hear very little pitch change (<= 20Hz or so) as
you move from the widest filter for a given mode to the narrowest filter for
that same mode.

3) Constant pitch as you switch between USB/LSB on an accurately tuned AM
signal like WWV and constant pitch as you switch between CW and CW-Reverse
on an accurately tuned CW signal.

  Is it difficult to satisfy number 3 if you tune the filters with
Spectrogram based on number 1? Has anyone come up with a reliable
methodology for doing this, or is it just something that you pretty much
play with until you are satisfied?

  Thanks, Michael N9BDF
          K2 #4137


PS  The "Amateur Radio Emergency Communications Consistency Act" (HR 1478)
and the "Amateur Radio Spectrum Protection Act" (HR 713 & S. 537) are in
Congress. Please contact your Congressmen to ask for their support of these
bills! See the following ARRL link for details:
http://www.arrl.org/govrelations/ <http://www.arrl.org/govrelations/>