AM Radio Communication Systems

A detailed Summary of AM Radio Communication Systems


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 range of 20 Hz to 20 kHz). These signals are amplified by the modulator. The modulator is just an audio frequency amplifier that increases the output of the microphone to a useable level. This increased audio frequency is input into a modulation amplifier (This is some type of non linear device), along with the carrier frequency. The carrier frequency is generated by the RF (radio frequency) oscillator. This oscillator is required to be extremely stable regardless of age or temperature. The audio is superimposed onto the carrier by the modulation amplifier. The low power modulated carrier is boosted in amplitude by one or more the radio frequency power amplifier. The antenna produces an electromagnetic wave which is radiated into space. This signal will be received by


This circuit recovers the audio signal and discards the r.f. carrier.

This makes the design and operation of the amplifier much simpler.



Some common words found in the essay are:
Linking RF, GAIN CONTROL, Operation Transmitters, Superheterodyne Receiver, FREQUENCY CHANGER, TV CRT, lf signal, superheterodyne receiver, input signal, low frequency, local oscillator, intermediate frequency, rf filter, audio signal, block diagram, radio station, automatic gain control, effect lf signal, transmitter effect lf, block diagram pic21, low frequency audio,

Approximate Word count = 1544
Approximate Pages = 6 (250 words per page double spaced)

Category: Technology

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