Elecraft K3S
firmware v3.42
Elecraft · Released Oct 6, 2009 · First seen Sep 14, 2026
Source:
elecraft.com
v3.42 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
Fixes squelch control at maximum rotation and HRD polling timeout.
- Squelch pot functions correctly when fully clockwise
- HRD polling timeout fixed when sub receiver not installed
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 3.42 / DSP 2.37
- POLLING PROBLEM WITH HRD FIXED: With no sub receiver installed, HRD (Ham Radio Deluxe) was still able to poll for its revision number, causing a timeout.
- SQUELCH CAN BE SET FULLY CLOCKWISE: In some cases rotating the squelch pot fully clockwise would open the squelch.
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