What is connected between the antenna and the mixer to avoid oscillator radiation?(a) LNA(b) Attenuator(c) Duplexer(d) Power amplifierThis question was addressed to me in class test.My question comes from Communication Receivers topic in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

What is connected between the antenna and the mixer to avoid oscillato

1.	What is connected between the antenna and the mixer to avoid oscillator radiation?(a) LNA(b) Attenuator(c) Duplexer(d) Power amplifierThis question was addressed to me in class test.My question comes from Communication Receivers topic in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics
Answer» The correct choice is (a) LNA Easiest explanation: LNA or low noise amplifier is placed in between the ANTENNA and the mixer. The oscillator SIGNAL is relatively strong and some of it can leak through and appear at the INPUT of the mixer. The RF amplifier between the mixer and the antenna isolates the TWO, SIGNIFICANTLY reducing any local oscillator radiation.

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