AM TRANSMITTERS & RECEIVERS

May 14th, 2015
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Amplitude modulation is when the modulating audio is combined with a radio frequency carrier is such a way that the total wave power is made to vary in accordance with the modulating audio.The normal type of AM is double sideband or, to be more specific, double sideband full carrier.

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AM transmitter and receiverReading 30Ron Bertrand VK2DQhttp://www.radioelectronicschool.comAM TRANSMITTERS & RECEIVERSRevision: our definition of amplitude modulation.Amplitude modulation is when the modulating audio is combined with a radio frequency carrier is such a way that the total wave power is made to vary in accordance with the modulating audio.The normal type of AM is double sideband or, to be more specific, double sideband full carrier.Recall that the carrier does not convey any intelligence to the receiver. The information is in the sidebands. Either sideband contains all of the information. The advantage of double sideband full carrier is simplicity in reception. The disadvantages are that it is not very efficient power wise, and the bandwidth is greater than is necessary for other modes, particularly voice communications.The carrier is used in the transmitter to heterodyne (mix) with the audio to convert the audio to radio frequencies (the sidebands), so that they can be radiated from an antenna. The carrier is transmitted along with the sidebands. The advantage of this is that the carrier is available to the receiver to once again heterodyne with the sidebands, this time to convert the sidebands back to the original audio frequencies, which can then be heard. If the carrier was not transmitted (SSB), then the receiver would have to generate its own carrier.Mixing or heterodyning in a transmitter is called modulating, whereas in a receiver it i

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