Elecraft K3S
firmware v3.11
Elecraft · Released Apr 18, 2009 · First seen Sep 14, 2026
Source:
elecraft.com
v3.11 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
Data submode now restored correctly; fixed sidetone pitch, switch tones, and balance control.
- Data submode restored correctly on power-up and band changes
- Sidetone pitch fixed during error conditions and TUNE
- Switch tones no longer stuck in wide AM bandwidth modes
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.11 / DSP 2.15
- DATA SUBMODE NOW SAVED/RESTORED CORRECTLY: On power up and on some band changes, the correct data sub-mode was getting lost.
- ERROR TONE PITCH PROBLEMS FIXED: The sidetone pitch was getting changed by certain error conditions and when doing TUNE.
- SWITCH TONES NO LONGER GETTING STUCK ON: In AM mode with wide AM bandwidths selected, tapping HI/WIDTH or LO/SHIFT could leave the switch feedback tones on, or omit the second switch tone entirely.
- BALANCE CONTROL MOVEMENT JUST AFTER POWER-UP NOW OK:
Someone noticed that if you power up the rig with the sub turned on, then moved BALANCE (SUB AF) before moving AF GAIN, the main receiver AF would be lost temporarily.
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