> I agree. The K3's APF just blows away the APF on both the IC7600 and > IC7700. The K3s APF is in a league of its own. Icom doesn't use a peaking filter. Their implementation of APF is really an "Audio Passband filter," rather than an "Audio Peaking Filter." When engaged, their APF filter skirt is really no different than selecting a narrow DSP setting where there's a flat top and sharp skirts. The response curve does not resemble that of an audio peaking filter. I found the APF to be of limited value on the 7800 and 7700 transceivers.
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