heterodyne oscillator heterodyne oscillator /ˈhɛtəroʊˌdaɪn ˈɑːsɪleɪtər/

noun

1. An oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones  ( heterodyne oscillator , local oscillator )
   an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones