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Detecting the high def TV for the Google Lunar X Prize.
On Jun 16, 8:06*pm, tom wrote:
Jim Lux wrote: Don't forget that DirecTV radiates a LOT more power than a typical deep space probe. AND they often have a higher gain antenna. A geosync relay satellite might have 96 TWTAs, each several hundred watts, on it, feeding a very clever multiple feed dish which is many meters in diameter (look at Thuraya, for instance). Wow. *96 TWTs with several hundred watts each. *From a satellite. *And what's the efficiency? So these are powered by what? *Small nuclear reactors? Certainly not solar panels. tom K0TAR Not all will necessarily be on at the same time. Typical narrow band coupled cavity TWTAs can get over 50% efficiency (DC in to RF out) Yes Solar Panels..10kW would not be unusual. See, e.g., http://en.wikipedia.org/wiki/ASTRIUM_E3000 ... 14 kW of power from 45 m^2 of solar panels and 4500kg of satellite.. This is so far beyond what is used in the scientific space program it's mind boggling. But, hey, out of the $1-2B cost, the TWTAs are probably only 5-10% of the total, and there are definitely quantity discounts. |
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