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Subsequently, communication systems using a number of low-altitude satellites
were seriously considered, because the time required for a signal to reach a low-
altitude satellite and return to Earth is less than that using a synchronous satellite
The lower frequency is chosen for the space-to-Earth path to favour the low-
power satellite transmitter in case of rain in the signal path. Some 500 megahertz
of bandwidth might be available around 12 gigahertz. Much larger bandwidth ...
lite and 7.8 gigahertz satellite-to-Earth. The power output of each is 3.3 watts.
With 40-foot ground antennas, a single satellite provides two two-way voice
channels. Multiple launches from a single booster placed seven of these
satellites in ...
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review