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A 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. Communications satellites are used for television, telephone, radio, internet, and military ...
All satellites broadcast at the same two frequencies, 1.57542 GHz (L1 signal) and 1.2276 GHz (L2 signal). The satellite network uses a CDMA spread-spectrum technique where the low-bitrate message data is encoded with a high-rate pseudo-random noise (PRN) sequence that is different for each satellite. The receiver must be aware of the PRN codes ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 January 2025. Objects intentionally placed into orbit This article is about human-made satellites. For moons, see Natural satellite. For other uses, see Satellite (disambiguation). Two CubeSats orbiting around Earth after being deployed from the ISS KibÅ module's Small Satellite Orbital Deployer A ...
Satellite television, like other communications relayed by satellite, starts with a transmitting antenna located at an uplink facility. [20] Uplink facilities transmit the signal to the satellite over a narrow beam of microwaves, typically in the C-band frequency range due to its resistance to rain fade. [20]
Satellite communications are affected by moisture and various forms of precipitation (such as rain or snow) in the signal path between end users or ground stations and the satellite being utilized. This interference with the signal is known as rain fade .
Vodafone said it had made the world's first video call via satellite using a standard smartphone from a remote location, and it plans to roll out the technology for its users across Europe later ...
The message recorded of Eisenhower.. SCORE (Signal Communications by Orbiting Relay Equipment) was the world's first purpose-built communications satellite.Launched aboard an American Atlas rocket on December 18, 1958, SCORE provided the second test of a communications relay system in space (the first having been provided by the USAF/NASA's Pioneer 1), [3] the first broadcast of a human voice ...
BEIJING (Reuters) -China on Wednesday launched a satellite that will act as a communications bridge between ground operations on Earth and an upcoming mission on the far side of the moon, marking ...