Electrical Engineering

I want to make a simple 7MHz direct conversion SSB receiver in order to materialize some RF concepts I have been teaching myself lately. My question revolves around the mixer portion. I'm failing to understand how the audio is extracted from the carrier wave. Lets suppose I want to listen to an audio signal that rides on a 7MHz carrier wave. What would my LO, or BFO frequency in this case, oscillate at? Would it be 7MHz and then would I need a 300KHz tuning range to listen to the full band of signals? Thanks.

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Mixers and Audio Extraction in a DCR Architecture

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