Direct Conversion Receiver for MF

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Direct Conversion Receiver for MF

What will happen if I use a direct conversion receiver with a local oscillator at the MF or 630 meter dial frequency of 474.2 kHz with WSPR-X? I realize that WSPR-X does not support IQ, but why do I need IQ for a simple DC receiver? Do I need to remove the lower sideband with a notch filter? I am working on a design for such a receiver. The audio passband will be about 3 kHz, close enough to the recommended 2500 Hz.