Elecraft K3S firmware `v5.46`

Elecraft · Released Jan 8, 2016 · First seen Sep 14, 2026

v5.46 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

RX; command from logging software now reliably exits transmit; KRX3 PCB revision C support added.

Written from Elecraft's release notes, which are printed in full below.

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IMPROVED T/R CONTROL FROM SOFTWARE APPLICATIONS: Some computer logging/contesting applications send an "RX;" command to exit transmit mode (e.g. N1MM, when ESC is pressed). This now works reliably even if transmit was initiated via PTT or any other method. Note: If an application sends "RX;" substantially before dropping the PTT line, the radio will still return to receive, but the user will see ERR PTT on VFO B and further transmit will be locked out until PTT is released. Similarly, if "RX;" is sent while external KEY input is still present, ERR KEY will be shown on VFO B, and transmit locked out until KEY in is released.
KRX3 support: Firmware detects latest KRX3 PCB (rev. C), which uses a different type of IC for selecting crystal filters. (No performance difference from older revisions.)

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