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51.

What generates the final carrier frequency?(a) Oscillator(b) Modulator(c) Antenna(d) Power sourceThe question was posed to me at a job interview.Query is from Radio Transmitters in portion Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer» RIGHT OPTION is (a) Oscillator

The best EXPLANATION: An oscillator, in most applications a crystal oscillator, generates the final carrier frequency. A modulator SIMPLY adds the information signal and an ANTENNA transmits the signal.
Discussion
52.

What device is used to prevent power from the transmitter from going to the receiver side?(a) Multiplexer(b) Duplexer(c) Monoplexer(d) FilterThis question was addressed to me in semester exam.This is a very interesting question from Radio Transmitters in section Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer»

Correct OPTION is (b) Duplexer

The explanation is: A duplexer is a device that is PLACED just before the antenna in a TRANSDUCER SYSTEM. It is BASICALLY a switch which allows both transmission and reception but only one at a time.
Discussion