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Satellite Communications

Satellite Communications. DirecTV and Satellite Radio. Overview. Direct Broadcast Satellite DirecTV Satellite Radio Background Common Technology Competitors XM SIRIUS WorldSpace. Direct Broadcast Satellite (DBS). Direct Broadcast Satellite Refers to either Television Service

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Satellite Communications

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  1. Satellite Communications DirecTV and Satellite Radio

  2. Overview • Direct Broadcast Satellite • DirecTV • Satellite Radio • Background • Common Technology • Competitors • XM • SIRIUS • WorldSpace

  3. Direct Broadcast Satellite (DBS) • Direct Broadcast Satellite • Refers to either • Television Service • Satellites which deliver service • Mini-dish systems • Parabolic Surface • Focuses incoming signals into Feed Horn • Reflects outgoing signals into narrow beam • Main part Consists of Low Noise Blockdown Converter (LNB)

  4. Direct Broadcast Satellite (DBS) • Typical System • Operates in upper Ku Band (12 GHz to 14 GHz) • Legislation • C Band • Proprietary equipment needed • Encryption • Smart Card • Fixed Satellite Service (FSS) • Operates in C-Band (3.4 GHz to 7 GHz)

  5. DirecTVGood TV, Better TV, DirecTV • Technology • Satellites • Three geostationary satellites • Two more to be launched • 18 x 20 in elliptical dish • 5 LNB’s • High Definition • Access Cards • D2/P12 – Current Issue • Law suits • ISO-7186 Smart Card Device • MPEG-II Compression • 270 Mbps down to 10 Mbps

  6. Satellite Fleet

  7. Satellite Radio • Background • Digital Audio Radio Service (DARS) • Established in 1992 • Operates in S-Band (2.3 GHz) • 4 Second Delay • Main Competitors • North America • XM and Sirius • Europe, Middle East, Africa • WorldSpace • Terrestrial Repeaters (Cell Towers)

  8. XM Radio • Technology • Satellites • Two geostationary satellites • XM Rhythm at 115° west • XM Blues at 85° west • Replaced previous XM Rock and XM Roll • Third as a spare • Uses 12.5 MHz of S band: 2332.5 to 2345.0 MHz • GM, Honda

  9. XM Ground Repeaters

  10. SIRIUS Radio • Technology • Satellites • Three Medium Earth Orbit • Extremely Elliptical Path • At least one satellite for 14 hours per day. • Positions • Radiosat 1, Radiosat 2, Radiosat 3 • Fourth as a spare • BMW, Daimler-Benz, VAG

  11. SIRIUS

  12. WorldSpace • Technology • Operates in L-Band (1.467 GHz to 1.492 GHz) • Satellites • AfriStar, AsiaStar, AmeriStar

  13. Summary • Direct Broadcast Satellite • DirecTV • Satellite Radio • XM, SIRIUS, WorldSpace • Background • Technology • Satellites

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