-
Cathode-Ray tube television
Vladimir Zworykin files a patent for a TV system that uses cathode-ray tubes in both the transmitter and receiver. This type of TV has an antenna that picks up radio wave signals from the transmitter, and it also has an antenna socket. Electron beams pass through a mask so that they can hit the perfect place on the TV screen. -
colored television
Farnsworth created the first electronic television. He originally created it at age 14 in his head. He visualized it by the way he plowed a potato field and realized that electrons could scan images on a screen one line at a time. Television is a mix of all the colored dots put on one screen and your brain will recognize the shape and understand what the picture is. This television was made but never used. -
black and white TV's
Black and white TV's were used from about 1936 to 1967. The screens were coated with a white phosphor and the electron beam "paints" the image, using a magnetic coil, onto the screen while the electron moves across and down the screen one line at a time. As the beam is painting the image, it intensifies to create a different shade of black, white, or grey. -
Use of satellite television
July 12, 1962, was the first live, public broadcast of an image through a satallite. This satellite was called Telstar. The devices on the Telstar were powered by solar arrays, and it had a nickel cadmuim battery for backup. The signals from the satallite were received and amplified by a low-noise "maser." Tracking occured in Maine and France by large microwave antennas. Scientists had to constantly study how the radiation of the environment that the Telstar was in affected it. -
Modern-day TV technology
Our modern-day TV's have 3 main parts: the TV camera that turns the pictures and sounds into signals, the TV transmitter that shoots the signal from the camera into the air, and the TV receiver that takes the signal and turns it back into the pictures and sounds.