How is the amplitude modulation of high-frequency electromagnetic oscillations carried out?

In the circuit of the transistor autogenerator of high-frequency oscillations, the transformer winding is connected in series with the oscillatory circuit, to the primary winding of which an ac voltage of the audio frequency is supplied. In the absence of a sound signal in the oscillatory circuit of the generator, harmonic oscillations of the high frequency voltage occur. When an audio frequency voltage is applied to the winding of a modulating transformer, an audio frequency voltage appears on the transformer winding.

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