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In BFSK __________ of constant amplitude carrier signal is switched between two values.

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In BFSK __________ of constant amplitude carrier signal is switched between two values.

(a) Phase

(b) Angle

(c) Frequency

(d) Amplitude

I got this question by my college director while I was bunking the class.

This interesting question is from Constant Envelope Modulation topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right choice is (c) Frequency

To elaborate: In BFSK, the frequency of a constant amplitude carrier signal is switched between two values according to the two possible message states. These states are called high and low tunes, which corresponds to binary 1 or 0.

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