After extensive experiments with tx audio settings in pursuit of "perfect
audio" for my purposes - dxing on 80m - I came to the conclusion that for my
voice with the HC-4, an offset of -0.07 with the 2.8 kHz filter was about
right.
It's not unusual for the 8-pole filters to have small offsets, which would be
particularly noticeable if on the bass side of the passband. I've heard of up
to 80 Hz (0.08) in some CW filters. Anything large than that, indicates
something else may be going on (like accidentally resetting the 5-pole offset
to zero as K7SV noted in the original post).
73, Bill
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