Elecraft K3S
firmware v5.29
Elecraft · Released Jun 16, 2015 · First seen Sep 14, 2026
Source:
elecraft.com
v5.29 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 External ALC and ADC Reference default settings for accurate measurements.
- External ALC defaults to OFF instead of ON at first power-up
- ADC Reference properly initialized to prevent power and SWR reading errors
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 5.29 / DSP 2.83 / FPF 1.22
- EXTERNAL ALC DEFAULT FIXED: External ALC (CONFIG: EXT ALC menu entry) was being set to ON at first-time power-up. It now correctly defaults to OFF. Any K3S first powered-up with rev. 5.26 should be checked for the correct setting (normally done at the factory). Set to OFF unless external ALC is in use.
- ADC REFERENCE DEFAULT FIXED: The A-to-D converter reference setting (CONFIG: ADC REF menu entry) was left uninitialized at first power-up, possibly with a value that could adversely affect the accuracy of power, SWR, and other readings. Any K3S first powered-up with rev. 5.26 should have ADC REF recalibrated (normally done at the factory).
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