Elecraft K3S firmware `v5.14`

Elecraft · Released Feb 26, 2015 · First seen Sep 14, 2026

v5.14 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

Restores dual-passband CW feature, fixes VCO calibration, requires one-time TX gain calibration.

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

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VCO CAL FIXED (NOT APPLICABLE TO KSYN3A): The original KSYN3 synthesizer must be calibrated at time of assembly using CONFIG: VCO MD. This is once again working correctly.
DUAL PB CW FEATURE RESTORED: The original DUAL PB (dual-passband) CW feature has been added back in. CONFIG: DUAL PB can be used to select either DUAL PB or APF (audio peaking filter). APF is the default. See manual for details.
50-WATT TX GAIN CALIBRATION REQURED (ONE TIME): The first time rev. 5.10 or later firmware is loaded into the K3, 50-watt TX gain calibration should be performed on all bands. This is fully automated by K3 Utility. This initializes transmit drive limit data that is now used to prevent overdrive of the KPA3 amplifier.

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