News How Do Big Satellite TV Dishes Work?

How Do Big Satellite TV Dishes Work?


Big Satellite TV Dishes

A big satellite TV dish generally uses a metallic reflector which forms a portion of a paraboloid of rotation. It transforms the spherical waves emitted by the radiating element, located in paraboloid focus, into plane waves, producing a radiation characteristic with a pronounced directivity along the axis of the paraboloid.

The narrow beam of electromagnetic waves received by the parabolic antenna is reflected and concentrated in the center.

Big satellite TV dishes have a very wide frequency band because the geometric features of the reflecting surfaces do not depend on frequency (reflector sizes are considered large in comparison with wavelength). The satellite antenna is connected to a radio transmitter device through a coaxial cable or a metallic waveguide in the form of an empty tube.

Huge amounts of Information are received on the Earths surface with the help of such satellite dishes, although in recent years smaller, more compact dishes have become more prevalent. These smaller dishes work on slightly different principles than do their larger counterparts.

Satellite Dish Diameters

The diameter of large satellite dishes varies depending on the characteristics of waves received or transmitted. Satellite television uses satellites located on elliptical orbits with a complete orbit time of about 12 hours or geostationary orbits, equipped with large parabolic antennas with diameters of between 9-12 meters, for a cleaner signal.

Satellite TV Frequencies

Satellite TV channel frequencies transmitted via satellite are received by a number of ground stations and distributed by transmitters and translators to cover a certain area or are received directly by individual viewers using home antennas. Ground stations use transmitters with output of about 5-10 kW, parabolic antennas of about 20-25 m and are equipped with the necessary equipment for tracking the location of satellites.Usually, the uplink and the downlink are set to different frequency bands (C or Ku), to avoid interference.

Using C-band satellites have about 24 channels of receive-issue with a bandwidth of 36-50 Mbits and Ku band satellites have up to 32 channels of reception-issue. To avoid interference, geostationary satellites should have a distance between them of 2 degrees or a degree, for those with C-band and Ku band respectively.

How Do Big Satellite TV Dishes Work?
General Contributor
Janice is a writer from Chicago, IL. She created the "simple living as told by me" newsletter with more than 12,000 subscribers about Living Better and is a founder of Seekyt.

Latest news

Japanese Owl Meaning and Symbolism

If you're wondering about the Japanese owl meaning and symbolism in Asian cultures, the Owl, along with Maneki Neko...

What Are the Signs of Depression in Women

Gender and depression have long been the scope of research in the field of emotional disorders; most authors believe...

Top 7 Superfoods for Men to Stay Young

Superfoods are generally regarded as targeted foods that provide the maximum nutritional benefit - thus these foods are nutritionally-dense...

Best Brain foods for Kids – Boost Brain Power and Keep Sharp

A child's brain is developing rapidly and if you want them to improve their performance in school and their...

7 of the Best Brain Foods for Studying

The foods that you eat can improve the functioning of your brain. Just like drugs, foods have amino acids,...

B12 Shots for Dogs – 10 Key Benefits

The end of 2010, my little dog -- a 7-pound Papillon -- became very stressed after a flood in...

Must read

Cheap Dirt Bikes for Kids

You'll be pleased to know that are a lot...

Dessert Recipes: Grannys Coconut Meringue Pie Recipe

Now I’m going to tell you this is...
- Advertisement -

You might also likeRELATED
Recommended to you