Elecraft K3S
firmware v5.09
Elecraft · Released Jan 25, 2015 · First seen Sep 14, 2026
Source:
elecraft.com
v5.09 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
Fixed KPA3 drive level limits and memory recall loss; corrected synthesizer startup detection.
- KPA3 per-band drive limits corrected to proper values
- Drive limits no longer lost when recalling memories from before calibration
- Synthesizer presence check fixed on power-up
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 5.09 / DSP 2.83
- KPA3 DRIVE LIMIT CHANGES: Per-band limits on KPA3 drive level were introduced in rev. 5.04. If a memory was recalled that had been programmed before the 50-W TX gain calibration was done on the current band, the drive limit would be lost. Also, the drive limit had been set too low. Those who loaded rev. 5.04 should load 5.09 and re-do the 50-Watt gain calibration, which is automated by K3 Utility.
- SYNTHESIZER TEST ON POWER-UP FIXED: The synthesizer presence check was not being done correctly in all cases.
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