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Two experimental FM stations, located 15 miles (24 km) apart in Albany and Schenectady, New York, were configured to transmit on the same frequency, in order to study how this would affect reception. It was determined that, for most of the path between the two stations, only one of the signals could be heard, with the complete elimination of ...
Despite testing in Sydney and Melbourne from as early as 1999, the first genuine plan for digital broadcast radio was released in October 2005, as Helen Coonan, the then Australian Minister for Communications, Information Technology and the Arts, announced that Australia would adopt the Eureka 147 system.
Mobile phone towers also often take advantage of diversity - each face (sector) of a tower will often have two antennas; one is transmitting and receiving, while the other is a receive only antenna. Two receivers are used to perform diversity reception. Cell antennas on an electricity pylon showing two antennas per sector. The use of multiple ...
The antenna was a 4-wire cage inverted "L" type, erected on two steel tube masts 90 ft. high, and 160 ft. apart. The masts were 6in. in diameter at the bottom, tapering to 4in. at the top. The spreader hoops in the antenna were of copper and approximately 70in. in diameter. The lead-in was also of the cage type on one foot ring spreaders.
Dedicated short-range communications (DSRC) is a technology for direct wireless exchange of vehicle-to-everything (V2X) and other intelligent transportation systems (ITS) data between vehicles, other road users (pedestrians, cyclists, etc.), and roadside infrastructure (traffic signals, electronic message signs, etc.). [1]
Two additional common age-related eye conditions that can interfere with night driving include age-related macular degeneration (AMD, a disease of the macula part of the retina, the light ...
Multiple-input, multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) is the dominant air interface for 4G and 5G broadband wireless communications. It combines multiple-input, multiple-output technology, which multiplies capacity by transmitting different signals over multiple antennas, and orthogonal frequency-division multiplexing (OFDM), which divides a radio channel into ...
Two element dipole array in front of a one wavelength square reflector used as gain standard. The gain of practical array antennas is limited to about 25–30 dB. Two half wave elements spaced a half wave apart and a quarter wave from a reflecting screen have been used as a standard gain antenna with about 9.8 dBi at its design frequency. [4]