Elecraft K3S firmware `v3.04`

Elecraft · Released Mar 25, 2009 · First seen Sep 14, 2026

v3.04 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

AGC now offers 15-25 dB IMD reduction option and memory recall preserves per-band settings; other bug fixes.

AGC SOFT decay mode reduces in-band IMD by 15-25 dB
Memory recall preserves per-band settings including PRE/ATTN and antenna selection
Fixed tuning errors from spurious signal removal in USB and CW REV modes

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

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Misc.

DSP AGC FIXED: You can now use the original fast and slow AGC decay setting (CONFIG: AGC DCY = NOR) if desired. In pileups or when listening to voice signals, try setting AGC DCY to SOFT. This can reduce in-band IMD by 15-25 dB. Also see release notes for rev 3.03/2.10 concerning AGC HLD and overall AGC options.
TUNING JUMPS DUE TO SPURIOUS SIGNAL REMOVAL: The use of CONFIG: SIG RMV no longer causes frequency tuning errors in USB and CW REV modes.
MEMORY RECALL: This now preserves all settings that should be per-band (not per-memory), including PRE/ATTN and sub antenna selection.
BSET INTERACTION WITH RIT/XIT: Using BSET no longer causes an unwanted change in RIT/XIT settings.
FIXED FA/FB COMMANDS AND 1-HZ TUNING: Non-zero 1-Hz digits are now preserved when FA/FB commands are received and FINE tuning is in effect.
ANT NAME FLASH: The antenna name is no longer flashed when A/B or REV are used. It is still flashed on any band or antenna change.

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