Transmitter

A television transmitter takes video and audio signals, modulates and amplifies them, and sends them out over the airwaves to television sets where viewers can turn them back into video and audio. Before any of this can happen, someone somewhere decides what channel, or frequency, will be used to deliver the signals to viewers in a specific community, as well as how strong that signal should be and how it should be dispersed. Once that is decided the appropriate equipment can be put in place. As you might expect, the transmitter has two main parts; a modulator and an amplifier. The modulator’s job is to mix the audio and video and produce a low-level television signal on the assigned channel. The amplifier then boosts the strength of the modulated signal and prepares it for transmission.