Elecraft K3S
firmware v3.06
Elecraft · Released Apr 1, 2009 · First seen Sep 14, 2026
Source:
elecraft.com
v3.06 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
Faster SSB power output, drive level no longer changes with ATU TUNE, all-mode squelch added
- SSB power reaches target faster
- Drive level no longer changes when using ATU TUNE
- All-mode squelch with configurable control options
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.06 / DSP 2.12
- SSB POWER CONTROL: Decreased time that SSB power output takes to reach target when PWR control adjusted. Also eliminated drive level change when ATU TUNE is used.
New Feature: All-mode squelch:
- SQUELCH IN ALL MODES:~ Locate CONFIG: SQ MAIN, then tap '1' until you see "ALL". To use the SUB RF/SQL pot to control both main and sub squelch, set CONFIG: SQ MAIN to =SUB POT. (In this case, MAIN RF will control both main and sub RF GAIN.) If you want independent control of main and sub squelch, set SQ MAIN to a numeric value (0 opens the squelch all the way). SQ MAIN and SQ SUB will then be fully independent.
(They can be assigned to programmable function switches if you use them frequently.) In this case MAIN RF GAIN and SUB RF GAIN are independent, using the two RF/SQL pots.
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