Elecraft K3S firmware `v3.68`

Elecraft · Released Dec 11, 2009 · First seen Sep 14, 2026

v3.68 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

AF output protection enhanced and AF LIM menu made accessible; 6m synthesizer stability improved.

AF output protection threshold increased to prevent false triggering in AGC-OFF mode
AF LIM menu entry now visible without requiring TECH MD
Synthesizer parameters updated on 6m band to prevent PLL unlock

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

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AF OUTPUT PROTECTION IN AGC-OFF CASE: Moved threshold up to prevent false triggering on moderate signals.
The CONFIG: AF LIM menu entry is now visible without setting TECH MD to ON. The AF LIM entry menu sets up an AF output max level that only applies when AGC is OFF. Recommended value is 18-24. Lower levels provide better protection but clip sooner. Adjust RF GAIN downward to eliminate clipping on individual signals. Narrow-band filtering can also help.
Synthesizer parameters updated on 6 m to eliminate possible PLL unlock when tuning in vicinity of 52 MHz.

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