How does satellite television work?

Answer 1

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Answer 2

This is possible because of Satellite Television technology. It uses man-made or artificial satellites to send your favourite serial to your television set. But why do we need satellites for this purpose? The earth is round To understand this, we have to first take a look at the shape of our earth. Indeed, the earth is a sphere. This means if I were to send signals from one place to another on the earth's surface, the signals would sooner or later get lost on the curved surface. This is the reason why radio and television towers are very tall. The taller the tower, the farther the signals go. Each tower gathers signals and beams them to the television sets which capture them using their antennas. However, making and maintaining these towers can be very expensive. Also, the area to which a television tower can send signals is small. This is why we need a satellite. It is used to send signals to television sets all over the world. A geo-stationary satellite A geo-stationary satellite is one which remains fixed over a particular area on the earth's surface. Actually, it rotates at the same speed as the earth. Hence, it appears to be fixed. These satellites are quite useful things. They can be used to beam a signal to any part of the earth's surface. When you send a signal to it, it can reflect it back to the earth or transmit it to another satellite. This way, it can reach anywhere on earth. Television broadcasting companies convert television programmes into signals. These are then beamed to satellites, which, in turn, reflect it back to the earth, where they are gathered by dish antennas, installed by the cable operators. The cable operator then transmits these signals through the local cable network to your television. In this entire broadcasting process, satellites behave only as reflectors in the sky that gather and re-transmit television signals.

Answer 3

Satellites orbit celestial bodies because the force of gravity (always attractive) is balanced with the satellites forward momentum. Think of it as constantly falling over the edge of the Earth. In other words, if you could hit a Golf ball far and fast enough, it would fall over the edge of Earth and keep going. If you remove gravity, it would shoot off into space in a straight line. If you remove forward momentum, it will fall to the ground.

Answer 4

when you activate your GPS device, it locks on to multiple satellites to give it its position. First, one satellite makes 'a circle' around your approx. position. The second makes another, making sure you are somewhere in where the 'circles' over-lap. The third locator then pin-points your location. Multiple satellites can do this to increase accuracy, too.

Answer 5

The idea behind this technical marvel is actually pretty simple. Let's bounce around a bit and throw some terms at you to get you a feel for how things work. Ready? Let's jump. We put a bird (satellite) in a high (stationary or geosynchronous) orbit. The bird is so far from the earth that its orbital speed matches the rotational speed of the earth. It's moving, and make no mistake about that, but at the same speed the earth turns. We point a microwave antenna (a "dish") at it here on earth, and take whatever information (TV signals, voice and data information, top hush military stuff) and transmit it up on our uplink. We're in business. Up in space, the receiving antenna system captures the incoming signals and routes them through an amplifier network. It then retransmits those signals at whatever frequency is appropriate for what is needed to get the signal to the targeted receivers. It might be a very narrow spectrum of microwave frequencies with a number of "channels" like is used to transmit programming to cable television company receiving stations. These downlink receivers are usually at the "head end" of cable distribution system so the signals can be "separated" and put down the cable as different channels. Or it might be a high power transmitter like DISH TV or DirecTV where each channel on the system is rebroadcast and a dish anywhere in the coverage area can "hear" all the signals. (We just need to pick a channel.) In the case of telecommunications, a band of frequencies is set aside, and the voice and data (in digital form) are uplinked and then downlinked to appropriate receivers. If you're talking on the phone or using the internet, some of your data packets could be routed through a satellite, depending on who you're talking to and what you're doing on the world wide web. Voice and data communications and the web are "merging" in some ways through the use of satellite communications. They're all just data streams anymore, and the current systems just handle digital signals; they don't care whether the data stream "came from" analog voice or sound signals, image or video signals, or anything else. The satellite could be looked at in some ways as a sophisticated "reflector" of ground-based signals. We beam 'em up, and then the bird sends them back at us. Certainly there is a lot of high tech stuff at work here, and more specific information can be gathered by doing a quick search of WikiAnswers. Or you could ask another question. A link is provided below for more detail. It's to the Wikipedia article on the satellite itself, and by reading this, you'll be able to "see through" the system to understand how it works.

Answer 6

The satellite collects energy from the sun in a similar fashion to terrestrial solar panels, after which it beams it down to a rectanna on earth through a microwave

Answer 7

Satellite transmission works uses a repeater station that is placed in orbit usually with the region it serves