Digital TV frequency is the specific location on the radio spectrum on which digital TV channels are transmitted. Ordinary analog television channels are received by an antenna searching on a single frequency within the ultra high frequency (UHF) range. The difference between analog TV frequency and digital TV frequency is that the digital signals are compressed into “multiplexes.” These multiplexes each contain numerous television channels — ordinarily around eight — all found on one single frequency. This is why digital frequency requires a special decoder for a television to reproduce the images and audio from the original signal.
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Television is transmitted through radio waves, which are collected by antennae and then sent to a television set, which reproduces the signal received as an audio and visual display. Radio waves are basically made up of fluctuations within the electromagnetic field. The specific properties of each fluctuation encode different pieces of information. Static occurs on a television because the leftover radiation from the big bang is all around us, and when not pointed to a particular frequency, the big bang radiation is picked up by antennae. Televisions try to display this like a TV channel, but incomprehensible static is all it produces.