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In the 1980s, Channel Master was the only second source for General Instrument (GI)'s Videocipher II module, a building block for satellite television receivers, under a licensing agreement for which Avnet paid GI a million dollars. The Channel Master 4251, a high-performance parabolic UHF television antenna, stood about seven feet in diameter ...
He also helped found Channel Master, which became a leading producer of television antennas after Resnick invented an antenna which was inexpensive, easy to assemble and install, and did not require the expertise of a specially trained technician.
A long-range seismic sensor network was used during the Andean Seismic Project in Peru. A multi-hop span with a total length of 320 kilometres (200 miles) was crossed with some segments around 30 to 50 kilometers (19 to 31 miles). The goal was to connect to outlying stations to UCLA in order to receive seismic data in real time. [2]
After 10 years in their Chicago facility, Andrew Corporation moved operations to Orland Park, Illinois, a suburb about 15 miles south of the 75th Street location. Andrew purchased the 430 acre vacant, unincorporated lot for $200 per acre. [ 19 ]
The F2 layer is found about 200 miles (320 km) above the Earth's surface and can reflect radio waves back toward the Earth. When the layer is particularly strong during periods of high sunspot activity, FM and TV reception can take place over 2000 miles (3000 km) or more, as the signal effectively "bounces" off the high atmospheric layer.
All studies agree the stability and quality of the link is highly dependent on atmospheric factors such as rain, fog, dust and heat. Relays may be employed to extend the range for FSO communications. [10] [11] TMEX USA ran two eight-mile links between Laredo, Texas and Nuevo Laredo, Mexico from 1998 [12] to 2002. The links operated at 155 Mbit ...