Communications satellites are nothing but radio transmitter/receivers ('transceivers').
Whether it's a direct-to-home TV satellite, an orbiting satellite carrying amateur radio (OSCAR),
or a Hubble Space Telescope, people on the ground transmit radio to it, and the satellite either
repeats the same information back down to other people, or performs some operations of its own
and then reports its results by radio to the people down below waiting for the report.
An elliptical satellite is a type of satellite that orbits Earth in an elliptical path, meaning its distance from Earth varies throughout its orbit. This results in the satellite moving closer to and farther from Earth as it completes its orbit. Elliptical satellites are commonly used for applications like communication and remote sensing.
The downlink frequency to Earth, in the context of communication satellites or spacecraft, refers to the frequency at which data is transmitted from the satellite to Earth. The specific frequency used can vary depending on the satellite system and the communication protocol being employed. Generally, downlink frequencies for satellite communication are in the microwave frequency range, typically between 1 to 50 GHz. The choice of downlink frequency is influenced by factors such as transmission range, atmospheric absorption, and regulatory requirements.
IN COMMUNICATIONS: Satellite uses satellite (orbiting) relay-stations in Space but Terrestrial uses cable or antenna-to-antenna signals based entirely on Earth to broadcast your television, radio or cell-phone :) ++++ IN ASTRONOMY: Terrestrial means Earth- (or planet-) bound; a Satellite is any natural or man-made object that orbits a planet. The Moon is a satellite of the Earth.
Meteroligical satellite
Radio waves are amongst the shortest. Gamma and X rays are shorter. The long wave lengths are at the other end of the electromagnetic spectrum. These are called 'infra red,
Gamma rays
Satellite TV uses microwaves, which are a type of electromagnetic wave. These microwaves travel between the satellite in space and a receiver on the ground to transmit television signals.
parabolic
Electromagnetic energy
Electromagnetic waves used for communication include radio waves, microwaves, and light waves (in the form of lasers). These waves are commonly used in technologies such as radio communication, satellite communication, Wi-Fi, and fiber optic communication.
Radio waves are most commonly used in communication due to their ability to travel long distances and penetrate obstacles easily. They are used for various purposes such as radio broadcasting, cell phone signals, Wi-Fi networks, and satellite communication.
Microwaves. These poke through the ionosphere to reach the satellite
It is communication with a satellite orbiting the planet using microwaves, a type of electromagnetic wave of lower frequency than light but higher frequency than radio waves. Microwaves are often used in this way as they can penetrate the earth's atmosphere, but can travel a long enough distance to reach the satellites, unlike x ray waves.
Radio waves are a type of electromagnetic radiation that can carry signals over long distances. In communication, radio waves are used to transmit information through radio and television broadcasts, cell phone calls, and Wi-Fi connections. They are also used in radar systems for navigation and in satellite communication for broadcasting and data transmission.
There are several uses of satellites which depends on the particular type. In most cases, they are used for space exploration, communication of signals, navigation and astronomical ventures among others.
radio waves (part of the electromagnetic spectrum)
Communication Satellite, launch and used by Philiipines