[Elecraft] 2.10B narrow filter anomaly

[Gill W4RYW]

I have been using ver 1.78 that shipped with rig and been quite pleased.
Figured I should update.When tuned to a steady tone (CW too!) I now get a
beat note effect on the width setting 100hz and 50hz only.  I have a 250hz
filter. Turn on IIR fixes problem. Only hear on FIR DSP. Sounds like two
identical freq tones beating - tuning the sig to a precise freq causes
effect to disappear. This is annoying to listen to.

SN#707

Gill W4RYW
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