Elecraft KX3
firmware v1.81
Elecraft · Released Dec 11, 2013 · First seen Sep 14, 2026
Source:
elecraft.com
v1.81 is not the latest firmware for the Elecraft KX3: the current version is v3.02 (April 8, 2022). Go to v3.02
In short — summary by updatemystuff.com
Added Heil HC-6 microphone element support with higher mic gain capability.
- Gain can be increased by up to 20 dB
Written from Elecraft's release notes, which are printed in full below.
Was this useful? Thanks.
What's in this update
MCU 1.81 / DSP 1.28
- SUPPORT FOR HEIL HC-6 MIC ELEMENTS: Mic gain can now be set as much as 20 dB higher to support these low-sensitivity elements. NOTE: USE LOW “MON” (VOICE MONITOR) LEVEL IF MIC GAIN IS SET ABOVE 50. Otherwise you may hear acoustic feedback. Also, higher gain settings in general can make any transceiver more susceptible to noise pickup. If this is a problem, consider using a more conventional mic element that has greater output. The Elecraft MH3 has excellent frequency response, comparable to earlier Heil elements, yet it has far higher output than the HC-6.
updatemystuff.com never hosts firmware files — always download from the official source.
Get it from ElecraftWatch the KX3 for updates
Create a free account and get an email the moment Elecraft publishes new firmware.
Create account & watch