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AM Operation AM Transmitters The process of AM radio signal transmission requires low frequency audio signals to be radiated long distances. This is done by superimposing the low frequency audio signal on a high frequency carrier wave by the process of modulation. This section will describe what each section of the AM transmitter is and the function of it.. The microphone converts sound waves into electrical signals at a very low level (the audio frequency …

…it's a microphone, in television engineering an image analysis cathode ray tube (CRT) etc. Then, with this "electrical image" of information, the modulation is being done. The modulated HF signal is being transferred into antenna and transmitted. On the reception place, the modulated signal from the reception antenna is being amplified and detected and then, again with the appropriate converter (pen recorder, loudspeaker, TV CRT etc.), the information is transformed back into its original form.