local oscillator

World English Dictionary
local oscillator
 
n
electronics the oscillator in a superheterodyne receiver whose output frequency is mixed with the incoming modulated radio-frequency carrier signal to produce the required intermediate frequency

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WordNet
local oscillator

noun
an oscillator whose output heterodynes with the incoming radio signal to produce sum and difference tones 
WordNet® 3.0, © 2006 by Princeton University.
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