Communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth.
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The Communications satellite was not placed in orbit for the purpose of sending data from one point on earth to another; the radio transmitter was meant to study the properties of radio wave distribution throughout the ionosphere.
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Since the Communications satellite is so far above Earth, the radio signal is attenuated due to free-space path loss, so the signal received on Earth is very, very weak.
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The Communications satellite executed several realtime transmissions before the non-rechargeable batteries failed on 30 December 1958 after eight hours of actual operation.
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Echo 1 was an aluminized balloon Communications satellite acting as a passive reflector of microwave signals.
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Telstar was the first active, direct relay communications commercial satellite and marked the first transatlantic transmission of television signals.
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The LES-1 active communications satellite was launched on 11 February 1965 to explore the feasibility of active solid-state X band long-range military communications.
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Molniya orbit is designed so that the Communications satellite spends the great majority of its time over the far northern latitudes, during which its ground footprint moves only slightly.
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Bandwidth available from a Communications satellite depends upon the number of transponders provided by the Communications satellite.
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Allocating frequencies to Communications satellite services is a complicated process which requires international coordination and planning.
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Two Communications satellite types are used for North American television and radio: Direct broadcast Communications satellite, and Fixed Service Satellite .
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Direct broadcast satellite is a communications satellite that transmits to small DBS satellite dishes .
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FSS Communications satellite technology was originally used for DTH Communications satellite TV from the late 1970s to the early 1990s in the United States in the form of TVRO receivers and dishes.
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