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Reference.org
Variable-frequency oscillator
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<p>A variable frequency oscillator (VFO) in <a href="/facts/Electronics/E4JhgISq">electronics</a> is an <a href="/facts/Oscillator/6vSrm84a">oscillator</a> whose <a href="/facts/Frequency/QUSbPaW8">frequency</a> can be tuned (i.e., varied) over some range. It is a necessary component in any tunable <a href="/facts/Radio/XFr909M2">radio</a> transmitter and in receivers that work by the <a href="/facts/Superheterodyne/S2SA0NCV">superheterodyne</a> principle. The oscillator controls the <a href="/facts/Radio_frequency/aWku7h4R">frequency</a> to which the apparatus is tuned. </p>