[Elecraft] APF vs 10 Hz DSP, why they don't sound the same

[Paul Christensen]

> "The circuit surrounding op amp 3016-2 in the FT-1000 schematic is nothing 
> more than an active bandpass filter, center frequency of about 1025 Hz, Q 
> = 35, with a gain of about 10.5 dB."

The APF filter is active on the Main Rx, CW mode only.  However, Fc is not 
confined to 1025 Hz; with the front panel "APF" control, it's adjustable 
roughly over the range of the CW BFO offset when the filter switch is 
engaged.

Paul, W9AC