Electronics Handbook/Electronic Machines/Audio Machines/Radio

Radio

Configurations

Basic Configuration

Basic Configuration requires two components Microphone connect with Speaker in a closed loop

Microphone + Speaker

Enhanced Configuaration

Microphone + Amplifier + Volume Control + Speaker

Radio Band Broadcasting

AM

Sound wave is tured into Standing Wave then mixed with Carrier wave to produce broadcasting wave called AM . This method requires the amplitude of the Carrier wave varies with the amplitude of the Sound wave's Enevelop

FM

Sound wave is mixed with Carrier wave to produce broadcasting wave called FM . In this method the amplitude of Sound wave and Carrier wave is unchanged only the frequency is changed

PM

Sound wave is shifted and mixed with Carrier wave to produce broadcasting wave called PM . In this method the amplitude of Sound wave and Carrier wave is unchanged only the Phase is changed