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____ in a radio system can be used to keep track of time of the day.

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____ in a radio system can be used to keep track of time of the day.

(a) Local oscillator

(b) Source

(c) Filter

(d) Amplifier

The question was posed to me in semester exam.

This intriguing question originated from Available Technologies for Cognitive Radio topic in portion Cognitive Radio Basics of Cognitive Radio

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Right option is (a) Local oscillator

Easiest explanation: Local oscillator is used as master timing control circuit in receivers of RF applications. It may also be used with mixer to change the frequency of a signal. Accuracy may be increased and jitter may be decreased by using complex circuitry.

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