high-definition television hdtv dtv atsc

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HDTV
NTSC terrestrial broadcast channels are essentially 6 MHz wide. Service in a given area (roughly a 50 mile circle around the broadcast station) is typically offered on every other channel in order to avoid interference effects. A relatively small range of channels are available (channels 2-69, 55-88, 174-216, 470-806 MHz).

HDTV
In 1987, the FCC issued a ruling indicating that the HDTV standards to be issued would be compatible with existing NTSC service, and would be confined to the existing VHF and UHF frequency bands.

In 1990, the FCC announced that HD would be simultaneously broadcast (rather than augmented) and that its preference would be for a full HD standard (rather than the reduced resolution EDTV).

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