Which circuit does the actual multiplexing process in frequency division multiplexing?(a) Linear mixer(b) Oscillator(c) RF amplifier(d) DuplexerI got this question in an international level competition.The origin of the question is Frequency Division Multiplexing topic in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Which circuit does the actual multiplexing process in frequency divisi

1.	Which circuit does the actual multiplexing process in frequency division multiplexing?(a) Linear mixer(b) Oscillator(c) RF amplifier(d) DuplexerI got this question in an international level competition.The origin of the question is Frequency Division Multiplexing topic in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics
Answer» The correct choice is (a) Linear MIXER Best explanation: The modulator outputs CONTAINING the SIDEBAND information are added algebraically in a linear mixer; no modulation or generation of sidebands takes place. The resulting output signal is a composite of all the modulated subcarriers. This signal can be used to MODULATE a RADIO transmitter or can itself be transmitted over the single communication channel. Alternatively, the composite signal can become one input to another multiplexed system.

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