Elecraft KX3 firmware `v1.36`

Elecraft · Released Jan 5, 2013 · First seen Sep 14, 2026

v1.36 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

SSB passband tuning now supports WIDTH/SHIFT controls as alternative to LO/HI CUT

Written from Elecraft's release notes, which are printed in full below.

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SSB PBT CONTROLS CAN BE SET FOR WIDTH/SHIFT: The default for passband tuning in sideband mode is LO/HI CUT (PBT functions I and II, respectively). If the PBT SSB menu entry is instead set to NOR, then SSB mode uses the same PBT functions as CW and DATA modes (WIDTH and SHIFT). If you alternate frequently between LO/HI CUT and NOR (width/shift) for SSB modes, you might want to assign the PBT SSB menu entry to a programmable function switch (PF1 or PF2). The parameter will then alternate between the two settings each time you hold the PFx switch.
AGC SLOW MIN NOW 10 (was 20).
AFSK-A SIDEBAND SELECTION NOW CORRECT: AFSK-A “normal” is LSB, reverse is USB.
NR ICON STATUS NOW AVAILABLE IN "DS" COMMAND BYTE 3: This now works as documented in the Programmers Reference. “K31” mode must be in effect.
OFS/VFOB LED STATUS NOW AVAILABLE VIA "IC" COMMAND: Use byte (e), bit 1. If this bit is 1, the “OFS” LED is on; if 0, the “B” (VFO B) LED is on.
RXSBNUL MENU FUNCTION NOW PROVIDES OPTIONAL I.F. NULL: This calibration step improves rejection of the ~16 kHz image that occurs with RX SHFT set to 8.0 (kHz). See separate instructions.

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