[Elecraft] K2 CW CAL FIL method

[Dan Barker]

Group:

What's wrong with this method (besides it doesn't confirm you are on the =
correct sideband):

Zero-beat to WWV.

Launch Spectrogram and put a marker at your desired CW note. (the WWV =
carrier should spike right under the mark).

Go into CAL FIL and adjust the AF Gain to see the WWV spike above the =
noise, hit DISPLAY and then tweak the spike back under the mark. Also =
adjust passband widths if necessary.

Exit Menu and find a quiet spot (or better yet, hook up the noise =
source).

Return to CAL FIL on FL 4 (Yes 4, we're doing this inside out).

Hit DISPLAY or BFO and center the passband on the mark.

Exit menu.

Retune to WWV (or whatever steady carrier you are using) and zero beat =
with FL4.

Reenter CAL FIL and set the other 3 filters to match the audio note of =
FL4. There is some interaction between FL1 and FL4, so an occational =
check of zero beat is done.

That's it. It seems a definitive way to minimize the note moving around. =
You are simply matching FL1, FL2 and FL3's note to FL4's, which isn't =
touched after step 6.



Notes:

  1) This is for the CW filters. I have NO IDEA how to do SSB filters =
(My KSB2 is installed, but the filters aren't tuned yet).

  2) This method came up because doing it frontwards, I seemed to always =
have a useless 100 Hz setting. The passband of the tight filter was down =
around 500 Hz, with the skirt down 10 dB at my desired note (trying for =
600 Hz). Tweaking FL4 only caused the note to jump around as you cycle =
the filters, as many have noted.

  3) Would something like this work for SSB? I don't even know how to =
zero-beat an SSB signal. I guess you have to know what the OM or YL is =
supposed to sound like, and then twist the knob until s/he sounds right? =
Hummmm. Well, I know how to adjust FL4, and PSK31 uses FL4 (but I bet it =
won't work without getting 1-3 right). There'll be late night lights in =
the shack tonight!




Dan Barker / WG4S / K2 #2456