local oscillator

local oscillator

An FM receiver is double conversion with a first IF of 10.7 MHz and a second IF of 455 kHz. High-side injection is used in both mixers. The first local oscillator is a VFO, while the second is crystal-controlled. There is one RF stage, one stage of IF amplification at the first IF, and three stages of combined IF amplification and limiting at the second IF. A quadrature detector is used as the demodulator. The receiver is tuned to a signal with a carrier frequency of 160 MHz. Draw a block diagram for this receiver.

local oscillator