Elecraft K3S
firmware v2.46
Elecraft · Released Oct 3, 2008 · First seen Sep 14, 2026
Source:
elecraft.com
v2.46 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
40-meter PA current reduced by correcting low-pass filter configuration
- Low-pass filter configuration corrected for 40-meter band
- AM compression disabled to eliminate distortion
- AM modulation level increased with improved mic AGC
Written from Elecraft's release notes, which are printed in full below.
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What's in this update
MCU 2.46 / DSP 1.94
- 40 METER PA CURRENT REDUCTION: This revision corrects the low-pass filter configuration used on 40 m. The 10/12 LPF, not the 6 m LPF, is now used in-line with the 40 m LPF. This optimizes return loss, keeping current at the target level at 100 W (about 20 A).
- NOTE ON AM COMPRESSION: Starting with MCU 2.45/DSP 1.92, speech compression has been disabled in AM mode. We hope to create a more effective compressor for AM in a future revision; the original was adding distortion without increasing ÒpunchÓ. On the other hand, the available AM modulation level has been increased, and were better utilizing the mic AGC system in this mode.
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