A television transmitter is an electronic device that radiates radio waves carrying a video signal and a synchronized audio channel, which is received by television receivers and displayed on a screen
. Television transmitters can be found in terrestrial (over-the-air) television systems and are part of a television station, which includes a broadcast studio that originates the content
. There are two main technologies used in television transmitters:
- Analog : In this technology, the picture and sound are transmitted by analog signals modulated onto the radio carrier
. The modulation mode of audio is FM, and that of video is AM
- Digital : In this technology, the picture and sound are transmitted by digital signals
. Digital TV transmitters can transmit signals over long distances without signal distortion, ensuring digital and sound quality, and support the transmission of edited pictures, such as changing the resolution of the picture or adding additional text and animation
Television transmitters must be licensed by governments and are restricted to specific frequency channels and power levels
. They transmit on frequency channels in the VHF and UHF bands, with radio waves traveling by line of sight, limiting reception distances to 40-60 miles, depending on the height of the transmitter
