Amplifier-Modulator

An amplifier-modulator, also known as an AM modulator, is a device used in communication systems to modulate an analog signal onto a carrier wave. It combines the functions of an amplifier and a modulator into a single unit.

The amplifier part of the device amplifies the low-level audio or video signal to a higher power level. This is necessary to ensure that the modulated signal has sufficient strength to be transmitted over long distances without significant loss or degradation.

The modulator part of the device takes the amplified signal and modulates it onto a carrier wave. In amplitude modulation (AM), the amplitude of the carrier wave is varied in proportion to the instantaneous amplitude of the input signal. This modulation process allows the original signal to be transmitted over a radio frequency carrier wave.

Amplifier-modulators are commonly used in radio broadcasting, where they are used to modulate the audio signal onto a carrier wave for transmission. They can also be found in other communication systems, such as television broadcasting and two-way radio systems.

Overall, amplifier-modulators play a crucial role in the transmission of analog signals over long distances, allowing for efficient and reliable communication.