K3 Enhancement: DSP APF – Audio Peaking Filter

Elecraft recently announced that they are adding an Audio Peaking Filter (APF) to the K3 transceiver. The DSP APF filter  is modeled to perform like analog APF filters such as the praised one found in early Yaesu FT-1000D transceivers. The filter is easiest described as the opposite of a notch filer as it applies gain

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