DirecTV-11
| DirecTV-11 | |
|---|---|
| Start date | March 19, 2008 |
| Launcher | Zenit-3SL |
| Launch site | Sea Launch Odyssey ( Pacific ) |
| Takeoff mass | 6060 kg |
| Mass in orbit | 3700 kg |
| Dimensions | 3.7 x 3.3 x 8.0 |
| Span in orbit | 48.1 m |
| Manufacturer | Boeing Satellite Systems |
| Satellite bus | BSS-702 |
| lifespan | 15 years (planned) |
| operator | DirecTV |
| Playback information | |
| Transponder | 32 (+12) Ka-Band 55 (+15) Spot-Ka-Band |
| Others | |
| Electrical power | 18 kW (BOL), 16 kW (EOL) |
| Power storage | 59 NiH cells with 328 Ah capacity |
| position | |
| Actual position | 99.2 ° West |
| drive | 445 N + four 25 cm XIPS |
| List of geostationary satellites | |
DirecTV-11 is a Satellite which HDTV -Television for DirecTV Users in North America offers. It was launched on March 19, 2008 by Sea Launch in the Pacific with a Zenit-3SL . After the test operation, the satellite was brought into its final position at position 99.2 ° West.
It is the second of three identical DirecTV satellites (DirecTV 10, 11 and 12) which were built on the basis of the Boeing 702 satellite bus . The contract with Boeing was signed in 2004. DirecTV-10 was launched on July 7, 2007 by International Launch Services from the Baikonur spaceport with a Proton-M / Bris -M and brought to position 102.775 ° West. DirecTV-12 was originally intended to remain on the ground as a reserve satellite, but was then brought into geostationary transfer orbit on December 29, 2009 from Baikonur with a Proton-M / Bris-M.
technology
DirecTV-11 transmits mostly MPEG-4 coded signals, which allows a more effective transmission compared to the standard channels coded in MPEG-2 and thus a larger number of channels.
DirecTV-10 and 11 are to be brought in close proximity to the satellites Spaceway -1 and Spaceway-2. These were actually developed to transmit simple broadcast and two-way Internet data on a 500 MHz wide channel. At DirecTV's request, Boeing switched off this option in order to transmit additional HDTV channels.
DirecTV-11 has 32 active and 12 reserve Ka-band transmitters for the large-scale transmission of national programs as well as 55 active and 15 reserve spot transmitters for local television channels. As stations are traveling wave tubes used which UTJ- of gallium arsenide - solar panels are powered m with a span of 48.1 and 18 kW (BOL) with energy. The signals are transmitted via two Ka-band antennas, each 2.8 meters in diameter, and nine other Ka-band antennas.
Individual evidence
- ↑ Boeing: Data sheet for DirecTV 10, 11, 12 ( Memento from May 24, 2011 in the Internet Archive ) (PDF; 196 kB)