Elecraft KX3
firmware v1.68
Elecraft · Released Sep 24, 2013 · First seen Sep 14, 2026
Source:
elecraft.com
v1.68 is not the latest firmware for the Elecraft KX3: the current version is v3.02 (April 8, 2022). Go to v3.02
In short — summary by updatemystuff.com
Fixed SSB low power output and improved KXPA100 external amplifier controls.
- Fixed SSB mode output stability at very low power levels
- KXPA100 amplifier powers down when radio shuts off
- KXPA100 automatically engages when power set above 10W
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 1.68 / DSP 1.23
- LOW POWER (UNDER 1 W) NOW WORKS IN SSB MODE: Previously, with very low power settings, SSB power output could drop to 0. 1 W or so and stay there.
- TURNING KXPA100 OFF ON POWER-DOWN OF KX3. See KXPASWcommand().
- KXPA100 PER-BAND POWER CALIBRATION: Set KX3 to 80 W and do TUNE on each band with a dummy load at the KXPA100.
- KXPA100 PLACED IN-LINE WHEN PWR SET ABOVE 10 W. This applies when the PA MODE menu entry is set to ON. If its OFF (which bypasses the PA and external ATU entirely), the KX3s PWR can still be set up to 12 W.
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