This link has been bookmarked by 1 people . It was first bookmarked on 29 Jun 2008, by zhao zhixin.
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14 Jul 08
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nine are currently active (five primary and four reserve), and five are in inventory
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above the equator to provide coverage between 75 o north latitude and 75 o south latitude.
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East Pacific (EPAC), West Atlantic (WLANT), East Atlantic (ELANT), Indian Ocean (IO), and West Pacific (WPAC).
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The A-series
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There are two series of DSCS III satellites: A-series and B-series.
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The B-series
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uplink services in the 7900-8400 MHz
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X-band region
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downlink services in the 7250-7750 MHz band.
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by the use of six limited-bandwidth transponders
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which are switchable between antennas by DSCS ground control.
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spectrum is divided into six bands
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Earth coverage (EC),
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area coverage (AC),
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spot coverage,
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two transmit 19-beam MBAs
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a receive 61-beam
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multibeam antenna
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Earth coverage horns (ECH
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a transmit-only gimballed dish antenna (GDA
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two receive and two transmit
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in the SHF band to relay telephone, data, wideband imagery, and secure digital signals
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Channel 3 has an 85-MHz bandwidth
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Four of the six RF channels have 60-MHz bandwidth
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channel 6 has a 50-MHz bandwidth
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Each uplink channel frequency is translated down by 725 MHz on the downlink with the exception of channel 6
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modified: 27-04-2005 23:10:02 Zulu
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