Elecraft KX3
firmware v1.12
Elecraft · Released Jul 25, 2012 · First seen Sep 14, 2026
Source:
elecraft.com
v1.12 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
Reduced minimum supply voltage to 7.5V, added VOX auto-off option at power-up, mic functions auto-disable in data modes.
- Minimum voltage requirement reduced from 8.0V to 7.5V
- VOX auto-off option selectable at power-up
- Mic up/down functions auto-disable in audio data modes
Written from Elecraft's release notes, which are printed in full below.
Was this useful? Thanks.
What's in this update
- MIN SUPPLY VOLTAGE NOW 7.5 V (was 8.0): Increases operating time when using an 8-cell NiMH battery pack. Allows the use of 5 W output in more cases.
- KEY OUT (ACC2) FOLLOWS CW DELAY SETTING: Prevents excessive switching of external equipment being keyed by the KX3s KEY OUT line. Set desired delay using DLY switch.
- VOX AUTO-OFF OPTION AT POWER-UP: Tap '4' in CW WGHT menu entry to select VOX NOR or VOX AUTO OFF. With AUTO OFF selected, VOX for CW, voice, and audio-based data modes will all be disabled on power-up. (Note: Control of this setting will be moved to the VOX GN menu entry for the beta release.)
- IMPROVED HANDLING OF UNINTENTIONAL KEYING ON POWER-UP: Includes two new error messages: ERR VOX (voice or audio-data mode VOX was activated) and ERR ACP (PTT was activated via the ACC2 jack with the given setting of the ACC2 IO menu entry). In the ERR VOX case, VOX is turned off. In the ERR ACP case, ACC2 IO is set to OFF.
- UP/DN MIC FUNCTIONS DISABLED IN AF DATA MODES: In this case the user will have a PC audio cable, not an MH3, plugged in at the mic jack. Eliminates the need to change the MIC BTN menu setting when switching from voice to audio data modes.
- VFO TEMPERATURE COMPENSATION DISABLE: This is experimental; it is intended to verify that it is possible to reduce short-term drift of the VFO during transmit. For beta test a different algorithm will be developed. Tap 'CMP' in REF CAL to toggle between TC=NORM and TC=OFF. NOTE: When the TC selection is changed, the operating frequency will shift as much as several hundred Hz when the VFO is first moved since the formula-based correction is no longer being applied, resulting in an offset. This could be corrected by readjusting REF CAL if desired.
- IO COMMAND FOR TURNING 3R ON/OFF: "IO3Rn;" where <n> = 0 to turn 3R off, or 1 to turn 3R on. For technician use only.
- IF XVn ADR is set to INT. TRN0-9, the Si570 output buffer is turned on, and K19 on the KXAT3 is switched to feed signal to an internal transverter module. This is experimental, intended for testing of the KX3-2M module.
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