Elecraft K3S
firmware v5.56
Elecraft · Released Oct 26, 2016 · First seen Sep 14, 2026
Source:
elecraft.com
v5.56 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
Scanning below 1 MHz now works, K-Pod macro display less obstructive, TX command blocking prevents audio muting
- Scanning no longer stalls at frequencies below 1 MHz
- K-Pod macro flash duration reduced when text decode is enabled
- Host commands disallowed during transmit to prevent audio side effects
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 5.56 / DSP 2.88 / FPF 1.26
- SCANNING WORKS WITH FREQUENCIES BELOW 1.0 MHz: Previously, scanning would stall in this case.
- REDUCED K-POD MACRO FLASH TIME: If text decode is enabled, then the length of time that K-Pod macro names are flashed is greatly reduced. This reduces the obstruction of text shown on VFO B.
- DT, FR, and FT HOST COMMANDS DISALLOWED IN TX MODE: Previously, these commands could be sent to the K3 during transmit from some software applications. This could cause side effects such as muting of transmit audio in DATA modes.
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