Elecraft K3S
firmware v5.63
Elecraft · Released Nov 22, 2017 · First seen Sep 14, 2026
Source:
elecraft.com
v5.63 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
KPA1500 can now control ATU TUNE with a single switch tap via ACC cable.
- KPA1500 controls ATU TUNE when ACC cable is connected
- TUNE mode automatically activates and deactivates
Written from Elecraft's release notes, which are printed in full below.
Was this useful? Thanks.
What's in this update
MCU 5.63 / DSP 2.88 / FPF 1.26
- KPA1500 ATU TUNE INTEGRATION: When used with a K3/K3S and the ACC cable, the KPA1500 completely controls ATU TUNE, requiring just a single switch tap. The amplifier automatically starts/stops TUNE mode at the K3.
updatemystuff.com never hosts firmware files — always download from the official source.
Get it from ElecraftWatch the K3S for updates
Create a free account and get an email the moment Elecraft publishes new firmware.
Create account & watch