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The BFO is off-set slightly (500 - 1 500 Hz) from the incoming signal to the detector. This is required:
to beat with the incoming signal
For CW or SSB detection, the BFO reinserts a carrier. It's offset slightly from the suppressed carrier frequency (for SSB) or the signal frequency (for CW) so that the mixing process in the product detector produces an audible beat note (difference frequency) in the 500-1500 Hz range.
Warning: Generated by AI