Elecraft K3S
firmware v3.27
Elecraft · Released Aug 21, 2009 · First seen Sep 14, 2026
Source:
elecraft.com
v3.27 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
Extends VFO tuning to 490 kHz, improves AUTONOTCH, fixes sidetone shift bug.
- VFO tuning extended to 490 kHz
- AUTONOTCH improved
- Low-sidetone shift bug fixed
Written from Elecraft's release notes, which are printed in full below.
Was this useful? Thanks.
What's in this update
MCU 3.27 / DSP 2.24
- AUTONOTCH improved.
- SHIFT=.01 BUG FIXED W/LOW SIDETONE PITCH (300 Hz).
- VFOS TUNE DOWN TO 490 KHZ.
For Software Developers:
- "IS" COMMAND BUG IN 10-HZ MODE FIXED.
- FINE SHIFT BIT ADDED TO "IC" COMMAND: Byte e, bit 6.
- "MN" GET COMMAND IMPLEMENTED.
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