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Pulse modulation is not used in which of the following?

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Pulse modulation is not used in which of the following?

(a) Telemetry systems

(b) Remote control models

(c) Switch power modes

(d) Communication of airplane with ATC

I got this question in a national level competition.

Query is from Pulse Modulation topic in division Digital Communication Techniques of Avionics

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Correct option is (d) Communication of airplane with ATC

Easiest explanation: Pulse modulation is used in telemetry systems to monitor spacecraft or missile, RC models, for switching power supplies like regulators and also as audio switching power amplifiers. Communication of airplane with ATC is amplitude modulated waves.

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