[Elecraft] K2 Filters Will Not Align Properly

[Dan Barker]

 I hope you are not trying to CENTER OP1 on 600 Hz. That's not right. You
want the skirt to fall to zero around 200 Hz (left) and around 3K (right).

There may be nothing wrong at all. If you did center it, you'd have
reception on both sides of zero-beat.

Dan / WG4S / K2 #2456

<snip>
The crystal filter passband will not adjust to center on a 600hz sidetone.
As you adjust the filters towards 600 hz using Spectrogram (say OP1), the
filter shape degrades and then severely attenuates the signal until NO audio
signal is visible on the Spectrogram display.
</snip>