What type of oscillators are used to input a wide range of frequencies to the IF amplifier?(a) LC oscillators(b) Crystal oscillators(c) Variable frequency oscillators(d) Diode oscillatorsThe question was asked in an interview for internship.My query is from Communication Receivers in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

What type of oscillators are used to input a wide range of frequencies

1.	What type of oscillators are used to input a wide range of frequencies to the IF amplifier?(a) LC oscillators(b) Crystal oscillators(c) Variable frequency oscillators(d) Diode oscillatorsThe question was asked in an interview for internship.My query is from Communication Receivers in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics
Answer» Correct option is (c) Variable FREQUENCY oscillators Easy explanation: The local OSCILLATOR is usually a variable frequency oscillator or a frequency SYNTHESIZER so that its frequency can be adjusted over a relatively wide RANGE. As the local-oscillator frequency is changed, the mixer translates a wide range of input frequencies to the FIXED IF.

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