Elecraft K3S firmware `v2.33`

Elecraft · Released Aug 28, 2008 · First seen Sep 14, 2026

v2.33 is not the latest firmware for the Elecraft K3S: the current version is v5.67 (January 22, 2019). Go to v5.67

In short — summary by updatemystuff.com

DSP filter position corrected at certain bandwidth settings; CW sidetone pitch display improved.

DSP IF filter position corrected at certain bandwidth and shift settings, especially in CW mode
CW sidetone pitch display accurate when shift control centered

Written from Elecraft's release notes, which are printed in full below.

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DSP FILTER POSITION CORRECTED: At some bandwidth and SHIFT settings, the DSP IF was shifted downward. Especially noticeable in CW mode.
SHIFT CONTROL CW CENTER FREQ DISPLAY: If youre using a CW sidetone pitch thats not at a 50-Hz boundary, it will now be displayed accurately when the SHIFT control is centered (i.e., when the asterisk appears).

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