Elecraft K3S
firmware v5.59
Elecraft · Released May 11, 2017 · First seen Sep 14, 2026
Source:
elecraft.com
v5.59 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 power control bug causing unexpected TX carrier activation.
- PWR adjustment sometimes enabled TX carrier, causing unexpected RF output
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 5.59 / DSP 2.88 / FPF 1.26
- POWER CONTROL BUG FIX: PWR control adjustment was sometimes enabling the TX carrier, so that tapping XMIT afterward would result in unexpected RF output. (Any subsequent transmit operation, e.g. another tap of XMIT, would clear the condition. For this reason the problem was rarely observed.)
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