Superheterodyne Receiver Part 1. How to Decide Single / Dual Conversion Superheterodyne Receiver.

Superheterodyne Receiver
   • Superheterodyne Receiver Part 1. How ...  

Superheterodyne Receiver Part 2
Block Diagram of Superheterodyne Radio Receiver.
   • Superheterodyne Receiver Part 2. How ...  

Superheterodyne Receiver Part 3
Superheterodyne Radio Receiver. What is Low-side & High-side Injection Mixer (Frequency Modulation)
   • Superheterodyne Receiver Part 3. How ...  

Superheterodyne Receiver Part 4
What is Image Freq. How we Reject Image Frequency. Why we need a dual Superheterodyne Receiver
   • Superheterodyne Receiver Part 4. How ...  

Compare the Performance of Single & Dual / Double Conversion Superheterodyne Receiver for AM & FM.

The SuperHeterodyne receiver is developed in the 1930 and can be used for both the AM and FM receiver.

A SuperHeterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. It was long believed to have been invented by US engineer Edwin Armstrong.

The diagram below shows the block diagram of a typical single-conversion superheterodyne receiver. (convert a received signal to a fixed intermediate frequency (IF) 1 time )

Block diagram of a typical superheterodyne receiver. Red parts are those that handle the incoming radio frequency (RF) signal; green are parts that operate at the intermediate frequency (IF), while blue parts operate at the modulating (audio) frequency. The dotted line indicates that the local oscillator and RF filter must be tuned in tandem.

If this is done with a single IF there is a tradeoff between low image response and selectivity. 

To overcome image response, some receivers use multiple successive stages of frequency conversion and multiple IFs of different values. A receiver with two frequency conversions and IFs is called a dual conversion superheterodyne, and one with three IFs is called a triple conversion superheterodyne.