Elecraft K3S
firmware v4.74
Elecraft · Released Nov 16, 2013 · First seen Sep 14, 2026
Source:
elecraft.com
v4.74 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
Bandwidth, diversity, and sub commands blocked during transmission to prevent errors; Remote Rig fixes.
- Bandwidth, diversity, and sub commands rejected during TX
- Remote Rig speaker mute fixed when entering TERM mode
- Remote Rig VFO B lock now working in remote mode
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 4.74 / DSP 2.82
For those using PC software:
- BW and FW (BANDWIDTH) SET COMMANDS SENT DURING TX ARE REJECTED (K3 returns "?;"). This prevents a possible DSP error (ERR DSE). A future release will allow use of these commands, as well as the "WIDTH" control.
- DV and SB (DIVERSITY and SUB) SET COMMANDS SENT DURING TX ARE REJECTED (K3 returns "?;"). This avoids possible side-effects.
For those using Remote Rig mode:
- REMOTE-RIG BUG FIXES: (1) speaker mute when entering TERM mode; (2) MODE display swap on PTT; (3) connection lost during PTT (when K3 was out of band before entering TERM mode); (4) encoder commands with VFO A/B locked before entering TERM mode; (5) VFO B lock now working in remote mode.
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