Elecraft K3S firmware v4.22

MCU 4.22 / DSP 2.71 / FPF 1.14

NOTE: Be sure to install all firmware files for this release, including FPF 1.14. Otherwise your menu text will be incorrect.

• SSB Reduced Power Level Bug Fixed. Error was introduced in DSP 2.65.
• AutoNotch "stutter" on return to Tx to Rx transition Fixed. Error was intrioduced in DSP 2.62.
• APF (AUDIO PEAKING FILTER) ADDED: APF provides enhanced copy of weak signals in CW mode, and is especially useful when signals are at the noise level. The K3s APF is patterned after the most successful analog APF implementations, and is equally effective in user tes​ts. To use APF, make sure CONFIG: DUAL PB is set to APF. (This is the default. ÒNORÓ restores the original DUAL PB function.) Then hold DUAL PB to turn APF on/off. A special DSP graphic display is used to show that APF is in effect. At the time APF is activated, the regular I.F. SHIFT setting, if any, is Òfrozen, Ó and SHI​FT then controls the center pitch of the APF filter in 5-Hz steps. APF is independent for the main and sub receivers, as well as for presets I and II. Switching between these two presets is a convenient way of turning APF on/off quickly.
• ADDED VOICE TX ÒFAST MONITORÓ: Normally the voice monitor includes a ~20-ms delay, which is necessary to hear how your on-air signal will sound (with compression, etc.). If you prefer to not hear any delay in the voice monitor, set CONFIG: TX MON to FAST.

Note: Youll still hear the delayed and processed monitor if you adjust the MIC, CMP, TX EQ or TX GATE settings while transmitting.

• TX NOISE GATE IMPROVEMENT: The Noise Gate/Downward Expander for voice modes has smoother response and much improved performance near the threshold.
• NARROW AF FILTER IMPROVEMENT: Adjusting SHIFT and WIDTH when using very narrow DSP filters no longer causes pop artifacts.