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The AA8V 6x2 Superheterodyne Receiver - BFO Schematic Diagram and Circuit Description
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Outboard BFO to add SSB capability to AM radios | Electronics dabbler
A beat-frequency oscillator
bfo.PNG
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Beat frequency oscillator - Wikipedia
A proper BFO for the Nova-Tech NOVA 3 RDF
AOR BFO-1, JEC BFO-1 External BFO - Beat Frequency Oscillator
