Elecraft K3S
firmware v4.38
Elecraft · Released Jun 14, 2011 · First seen Sep 14, 2026
Source:
elecraft.com
v4.38 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
Improved SWR measurement sensitivity on 6 meters and enhanced bar graph remote control.
- KAT3 tuner timing and power threshold adjustments for better SWR measurement
- Bar graph remote control command now accepts 'R' or 'T' suffix to show RX or TX values
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 4.38 / DSP 2.73
- KAT3 IMPROVEMENTS: T/R timing and power thresholds changed to improve SWR measurement sensitivity. This should help on 6 meters in particular.
- ÒBGÓ (BAR GRAPH) REMOTE CONTROL COMMAND:
Added 'R' or 'T' at end of command to indicate RX (S units) or TX (watts).
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