What is super heterodyne receiver?

Answer 1

A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.

Answer 2

The original heterodyne detector was pioneered by Canadian inventor Reginald Fessenden

in 1905, but it was not pursued far. The vacuum tube electronic oscillator would not arrive

until 1912. The autodyne receiver, which has one stage function as both a local oscillator

and a heterodyne mixer, had several inventors around 1912 to 1913. The superheterodyne

principle was revisited in 1918 by U.S. Army Major Edwin Armstrong in France during

World War I.