Elecraft KX2
firmware v3.00
Elecraft · Released Jun 8, 2020 · First seen Sep 14, 2026
Source:
elecraft.com
v3.00 is not the latest firmware for the Elecraft KX2: the current version is v3.02 (April 8, 2022). Go to v3.02
In short — summary by updatemystuff.com
LPF relay control improved with longer pulses for temperature reliability; optional jumper workaround available.
- LPF relay pulse duration increased for temperature extreme reliability
- Optional jumper workaround for persistent 40/60m relay issues
- SPARE A I/O expander output added as supplemental relay drive
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.00 / DSP 1.52
- LPF RELAY CONTROL IMPROVED: Longer on/off pulses are now sent to the latching relays on the RF board to ensure reliability at temperature extremes. If problems persist with the 40/60 meter LPF relay, add a jumper from the “SPARE A” pad (U1 pin 26) to U1 pin 2. This revision of firmware uses the SPARE A I/O expander output (GPA5) as a supplemental to the original 40/60 meter relay drive line.
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