How A Satellite Dish Works – Satellite Technology
Satellite dishes are a type of parabolic and microwave antenna. The dish picks up or sends out electromagnetic signals from a satellite. It can be used for data, radio or television. The size and design of a satellite dish vary depending on the use of it. The most common satellite dish used by individuals is the one for television programming.
The parabolic shape of a dish reflects the satellite signal from the focal point to the LNB. An LNB is a low-noise block converter. It converts the high frequencies (electromagnetic waves) received from the satellite to lower ones (electrical signals) that can be sent through coaxial cable. This signal is sent from the satellite dish to a special receiver and then to a television set. This allows the picture and sound quality to be reproduced at a higher level than if it was not converted.
The satellite dish consists of a metal reflector (antenna) and an LNB held in front of it by a support arm. These are placed on a pole (mast) and mount. The satellite dish can be set to pick up specific satellite signals. Changing the elevation of it does this. This is an adjustment of precise degrees needed for UK TV satellites.
For satellite dishes to work there has to be a direct line of signal from the dish to the satellite in the sky to work. This means there can be no obstructions of any kind between the satellite and dish. The dish must be located in an area clear of trees, bushes, buildings or any other objects. It has to be mounted securely and completely level to function correctly. It must be set to the precise elevation degree needed. A coaxial cable is connected to the LNB, grounded through a grounding block and then run into the house. This cable is attached to a satellite receiver and then to a television.