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In the 1950s, a broadband network of AT&T L-carrier and microwave relays known as Long Lines was constructed. These circuits could be (and were) used for normal telephone traffic, but were also used to relay the video signals of the three US commercial television networks (ABC, CBS, and NBC) to their various affiliated stations around the country.
The tower appears to be in use for other purposes; the vertical antennas at the top and the round dark grey dish are not part of the original system. TD-2 was a microwave relay system developed by Bell Labs and used by AT&T to build a cross-country network of repeaters for telephone and television transmission.
The wavelength of 54 MHz (Channel 2) is 5.5 m (18 feet) (λ × f = c) so the antennas must be a minimum of 2.25 m (90 inches) apart. It is also important that the cables connecting the antennas to the signal splitter/merger be precisely the same length to prevent phasing issues, which cause ghosting with analog reception. That is, the antennas ...
Steel poles should meet industry specifications such as: TIA/EIA-222-G, Structural Standard for Antenna Supporting Structures and Antennas (current); TIA/EIA-222; Structural Standards for Steel; and TIA/EIA-RS-222, or an equivalent requirement set to help ensure a robust and good quality pole is being used. Fiber-reinforced composite (FRC) poles
A sixth station in Pittsburgh was proposed, but its originating radio station failed to gain a TV license. When General Teleradio de facto became the owner of MBS in 1951 by acquiring all but one of the network's largest affiliates, [ 10 ] General Tire president Thomas F. O'Neil started putting a potential MBS all-movie network together.
Early television evolved from the network organization of radio in the early 1940s. Three of the four networks that rose to dominance, NBC, CBS, and ABC, were corporations that were based in the business center of New York City; the fourth was the Mutual Broadcasting System, a cooperative of radio stations that, though its member stations entered television individually, never had a ...