[Elecraft] Crystal Filter Offset in 4.81, What does it mean?

[Mike K2MK]

I installed the 4.81 beta firmware and I am able to change the crystal filter
offset as described in the firmware notes. I can hear slight differences in
a CW signal between 0.1, 0.2, and 0.3 KHz. What I don't understand is what
does it mean. Previous to this release I would have assumed that the crystal
filter is centered on my chosen CW pitch suggesting a 0 KHz offset. If I
choose one of the 3 offsets am I now listening (and transmitting) slightly
off zero beat. Why would I want this? Wouldn't I also want a 4th choice of 0
KHz?

Explanations in layman's terms would be appreciated.

73,
Mike K2MK



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