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In the center of the reference picture, the accompanying image includes an AzEl installation rotator, so named for its controlling of both the azimuth and the elevation components of the direction of an antenna system or array. Such antenna configurations are used in, for example, amateur radio satellite or moon-bounce communications.
DirecTV-1R was launched on October 9, 1999, aboard a Sea Launch Zenit-3SL launch vehicle. It was the first satellite used to broadcast local channels for DirecTV in major DMAs , and was positioned at 101.2° W when it first entered service. [ 29 ]
In telecommunications and radar engineering, the antenna boresight is the axis of maximum gain (maximum radiated power) of a directional antenna.For most antennas the boresight is the axis of symmetry of the antenna.
In satellite broadcasting, a bearing is the combination of antenna azimuth and elevation required to point (aim) a satellite dish antenna in a given direction. The bearing for geostationary satellites is constant. The bearing for polar-orbiting satellites varies continuously.
The aim is either for the cell system to report the location of a cell phone placing an emergency call or to provide a service to tell the user of the cell phone where they are. Multiple receivers on a base station would calculate the AoA of the cell phone's signal, and this information would be combined to determine the phone's location.
DirecTV supplies BBCs with all 5-LNB K u /K a-band dish systems. The satellite signal from T10 is downconverted at the dish to the frequency range of 250-750 MHz, called "K a-lo". At the receiver when necessary, the BBC in response to a control signal from the receiver blocks any original "K a-hi" signals between 1650-2150 MHz. Then up-converts ...
The receiver uses different power supply voltages (13 / 18 V) to select vertical / horizontal antenna polarization, and an on/off pilot tone (22 kHz) to instruct the LNB to select one of the two frequency bands. In larger installations each band and polarization is given its own cable, so there are 4 cables from the LNB to a 'multiswitch ...
The signal transmitted from the satellite to the receiver crosses the ionospheric shell in the so-called ionospheric pierce point (IPP). The zenith angle at the IPP is z' and the signal arrives at the receiver with zenith angle z. Here R is the mean Earth radius, H is the mean height of the ionosphere shell.