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HDTV broadcasts—which must be sent over the air in bigger packages—limit broadcasters’ ability to multicast. See Are HDTV and multicasts competing technologies?

April 26, 2017ability air Bigger hdtv Multicast sent

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HDTV broadcasts—which must be sent over the air in bigger packages—limit broadcasters’ ability to multicast. See Are HDTV and multicasts competing technologies?

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(Also, multicast technology allows some stations to rent out unused portions of their FCC-licensed spectrum allotment to pay-TV providers, or to use them for other information services.) Many broadcasters already offer multicast channels today, which are available over the air to viewers who own newer TVs equipped with digital tuners. For example, channel 4 in your area may offer separate digital programming streams on channels 4.1, 4.2, and 4.3 in the digital band. A converter box will allow you to watch multicast channels on your old analog TV. Muticasting can also be called “multiplexing.