Electronics Engineering
Software Engineering

How does a transmitter work?

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September 22, 2009 10:56AM

There are many types of transmitters. Thesimplest is the

Amplitude Modulated (AM) transmitter. This is an oscillator that

cycles at a predetermined frequency. This oscillator puts out a

level of energy that is varied by the sounds that you desire to

transmit. This variance is done from 100% of the signal to 0%. The

output then is two frequencies combined one at the stations

frequency and one at the frequency of the sound transmitted. The

receiver throws away the transmission frequency and amplifies the

frequency of the sound.


Bottom line is you only hear the sound stuck into the

transmitter.


F.M. is the same as AM but instead of varying power, we vary the

frequency with the desire sounds we want to hear. The receiver sees

that variance and converts that to sound.


Phase shift, DSB, SSB and the others are merely more complex

variances to these basics.


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