Box Centers and Antenna Alignments Sample Clauses

Box Centers and Antenna Alignments. All geosynchronous spacecraft move about in latitude, longitude and altitude within their defined stationkeeping box. GE Americom maintains its C-band spacecraft within plus or minus 0.1(degree) (+/-45 miles) in latitude and longitude and the Ku-band spacecraft within plus or minus 0.05(degree). In practice, they are actually maintained much closer than this. Periodically, the spacecraft is exactly (+/-.005(degree)) in the center of the box. The dates and times of these box centers are announced on a recording: * Nationwide (000) 000-0000 These box center opportunities should be utilized to align non-tracking earth station antennas on a particular spacecraft in azimuth, elevation and polarization. A spectrum analyzer or other device responding to signal levels can be used to peak up the antenna. This assures optimum system performance no matter where the spacecraft is in the box. Once correctly adjusted and tightened down, the antenna should not have to be adjusted again in azimuth and elevation unless it is moved or damaged. Polarization may have to be optimized by the TOC when a carrier is first transmitted.
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