ABSTRACT
A single coaxial cable has an enormous channel capacity. When we are talking about a channel, we are referring to a 6-MHz video channel capable of carrying video, stereo-audio and chroma carrier.
The transmission of an NTSC video channel, usually and until now, consists of an analog signal stream that can be modulated to any frequency assignment on the cable. Cable modulators are fairly inexpensive and can be used to stack one channel on top of another. The TV-set at the receiving location utilizes an inexpensive demodulator or tuner to remove the carrier frequency and to separate video and audio for display on the screen. Cable-ready TV-sets incorporate tuners capable of selecting 100 or more channel assignments.
