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Originally posted by Pilgrum
I'd go for it being electrical interference caused by the fault currents in WTC2 until fuses or circuit breakers cut those circuits but I would have expected some interference in the video as well like 'snow' at the same time.
The 110th Floor of 1 WTC (North Tower) housed commercial and public service radio & television transmission equipment. The roof of 1 WTC contained a vast array of transmission antennas, including the 360 ft (approx 110m) center antenna mast, which was rebuilt in 1999 by Dielectric Inc. to accommodate DTV.
The center mast contained the television signals for almost all NYC television broadcasters: WCBS-TV 2, WNBC-TV 4, WNYW 5, WABC-TV 7, WWOR-TV 9 Secaucus, WPIX 11, WNET 13 Newark, WPXN-TV 31, and WNJU 47. It also had four NYC FM broadcasters on it as well: WPAT-FM 93.1, WNYC 93.9, WKCR 89.9, and WKTU 103.5
DIELECTRIC COMMUNICATIONS AWARDED
WORLD TRADE CENTER (NYC) DESIGN CONTRACT
FOR HDTV/NTSC ANTENNAS
RAYMOND, MAINE - January 5, 1996 - New York City's Television Broadcasters have awarded Dielectric Communications a contract for two antenna system designs to be installed on the World Trade Center involving nine stations.
One design involving World Trade Center 2 (WTC2) consists of a new mast specifically for HDTV broadcasting. A second design will interweave new HDTV antennas with existing NTSC stations on the World Trade Center 1 (WTC1) Building.
When the Twin Towers collapsed on Sept. 11, New York lost what was arguably the best antenna sites in North America.
At 1,368 feet above street level, 1 WTC (the North Tower) was the tallest building on the eastern seaboard. This is why its 207-square-foot rooftop was dotted with antennas at five-foot intervals. At 1,362 feet, 2 WTC's rooftop was also home to several antenna sites, including the New York State Police's primary transmitter site for its Metro-21 800MHz EDACS trunking system. So the loss of the Twin Towers was a serious blow to public safety operators.
As for non-broadcast applications, the rooftops of 1 WTC and its twin, 2 WTC, were home to a veritable forest of antennas—98 in all. These served a wide range of networks, including the Port Authority’s 800MHz Ericsson EDACS trunking system, which was lost in the fire and building collapse. One of the federal government’s 400MHz Motorola Smartnet trunking systems was destroyed as well, said Larry Van Horn, an editor with Monitoring Times, a magazine for scanner enthusiasts.