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Which oscillator is used as a local oscillator in radio receiver?

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Which oscillator is used as a local oscillator in radio receiver?

(a) Wien-bridge

(b) Hartley

(c) Crystal

(d) Phase Shift

This question was posed to me during an interview.

The origin of the question is Receiver topic in chapter Elements of Communication System of Analog Communications

1 Answer

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Correct answer is (b) Hartley

Easiest explanation: Oscillator which is used as a local oscillator in radio receiver is generally a tuned circuit. This tuned circuit consists of inductors and capacitors to determine the resonant frequency, therefore it is an LC tuned circuit. Out of the four options, only Hartley Oscillator has an LC resonant tank circuit.

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