|
|
|
I Challenge the 'experts'
GREAT WHITE BROTHERHOOD OF MASTER CRAFTSMEN: What the nature of 'mystery schools' was before Tuthmosis re-organized them (25) is hard to say. The claims of people within the Masons are challenged by many scholars. In reading the work of Conor...
Mobile SMS Basics
Man is a social animal. This feature instigates him to develop sundry ways to communicate with his fellow beings. From pigeons to postmen, from small messages on bits of paper to lengthy love letters and telegrams...we have now have a smart and...
Start here...first principles (D)
Start here…first principles (D) Terry Dashner……………Faith Fellowship Church, PO Box 1586 Broken Arrow, OK 74013 What’s the foremost law of science? Norman Geisler and Peter Bocchino raise this question in their book entitled, Unshakable Foundations...
Taking Back Your Power in Health Care
Taking Back Your Power in Health Care I was dismayed recently to see an article on the front page of the USA Today on the crisis in the cost in health care. Basically, the article was asking, “Who is to blame for the continual upward spiral in...
The Myth of Mental Illness - Part I
"You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird… So let's look at the bird and see what it's doing – that's what counts. I learned very early the...
|
|
| |
|
|
|
|
|
|
The Science Behind Satellites
The Science Behind Satellites
By Kate Ivy and Gary Davis
Dish-Network-Satellite-TV.ws
Webmasters: You may reprint this article in its entirety, providing you leave the Byline and About the Author sections intact, including the links to Dish Network Satellite TV.
The Science Behind Your Satellite Dish
Ever wonder how your satellite system works? There’s actually quite a bit of science going on behind the scenes, with several components working together to bring you that digital-quality signal. Here’s a quick look at the pieces that form your satellite puzzle.
Your channel selection begins with the programming sources themselves. Companies like Showtime, HBO and Starz! all create their respective programming. Channel providers then purchase rights to this programming so that they can broadcast the shows via satellite. Once a provider has their programming in place, they turn their attention to the broadcast center to compress and convert the programming for satellite broadcast.
Your programming original arrives as a digital stream of video, which is then compressed and converted through an encoder, typically using the MPEG 2 format. This format reduces the overall size of the video, making it possible for a satellite to broadcast hundreds of channels at the same time.
Once encoded, the video is then encrypted so that the broadcast can only be viewed by paying subscribers. This encryption “scrambles” the signal so that those without the proper receiver pick up distorted and unintelligible video. After the video has been encrypted, it is sent to the provider’s satellite, strategically positioned in the sky.
The satellite itself uses a dish similar to
your own satellite dish, to receive the video and send it back down to Earth to the provider’s subscribers. The satellite contains numerous transponders, components that allow the satellite to pick up the broadcast signal, amplify it and resend at a specific frequency. In addition to the transponders, satellites typically have several other onboard components, including a power source such as solar panels or rechargeable batteries and a computer system to monitor the satellite’s various functions and conditions.
When the satellite sends the signal back down to Earth, it is picked up by your dish, a small round antennae that receives the satellite’s broadcast and send the video on to your satellite TV receiver.
The receiver is that little black box that sits inside your home and allows you to choose which channel you want to watch. The receiver actually performs several crucial functions in the satellite viewing process, including the decryption of the signal itself. If you’ll remember, the satellite signal was scrambled by the provider to protect it from un-paying consumers. Your receiver “de-scrambles” that signal and converts the signal into a format that your television can handle, such as analog or more recently, HDTV.
Together these amazing components create a vividly clear digital picture for over 200 satellite channels. How’s that for programming genius?
About the Author
About the Authors: Gary Davis is owner of Dish Network Satellite TV and has written numerous articles on the satellite television industry. Kate Ivy has written for a variety of publications and websites and is the owner of
Ivygirl Media & Design.
|
|
|
|
|
| Science/AAAS | Scientific research, news and career information |
| International weekly science journal, published by the American Association for the Advancement of Science (AAAS). |
| www.sciencemag.org |
|
| Science/AAAS | Table of Contents: 1 December 2006; 314 (5804) |
| This Week in Science: Editor summaries of this week's papers. Science 1 December 2006: 1349. ... 2006 American Association for the Advancement of Science. ... |
| www.sciencemag.org |
|
| Science.gov : FirstGov for Science - Government Science Portal |
| Science.gov is a gateway to government science information provided by US Government science agencies, including research and development results. |
| www.science.gov |
|
| ScienceDaily: Your source for the latest research news and science ... |
| ScienceDaily -- the Internet's premier online science magazine and science news web site -- brings you the latest discoveries in science, health & medicine, ... |
| www.sciencedaily.com |
|
| Science News - New York Times |
| Find breaking news, science news & multimedia on biology, space, the environment, health, NASA, weather, drugs, heart disease, cancer, AIDS, mental health ... |
| www.nytimes.com |
|
| Science News Online |
| Weekly magazine offers featured articles from the current issue along with special online-only features. Includes photo collection, archives, ... |
| www.sciencenews.org |
|
| Science in the Yahoo! Directory |
| Explore the fields of astronomy, biology, geology, mathematics, and physics and all of their related disciplines with resources designed for professionals, ... |
| dir.yahoo.com |
|
| Open Directory - Science |
| Agriculture (2454); Anomalies and Alternative Science (525); Astronomy (4208); Biology (20593); Chemistry (4852); Computer Science@ (2358) ... |
| dmoz.org |
|
| BBC - Science & Nature |
| The best of BBC Science and Nature, from TV and radio, to the web and beyond. Take a tour from the smallest atoms, to the largest whales and the most ... |
| www.bbc.co.uk |
|
| Science - Wikipedia, the free encyclopedia |
| Sciences versus Science: the plural of the term is often used but is difficult to ... Science education is also a very vibrant field of study and research. ... |
| en.wikipedia.org |
|
| Popular Science |
| Monthly magazine about current science and technology. |
| www.popsci.com |
|
| Science/AAAS | ScienceNOW: The Latest News Headlines from the ... |
| AAAS web magazine. Some free sample stories, subscription required for full text. |
| sciencenow.sciencemag.org |
|
| ScienceCareers.org | Science Jobs, Funding, Meetings, and Advice ... |
| Searchable database of jobs, sorted by field specialty. Can post resume and curriculum vitae. Includes tips for improving the workplace for employers and ... |
| sciencecareers.sciencemag.org |
|
| American Association for the Advancement of Science |
| Research news, issue papers. Educational programs, science policy (US and international). |
| www.aaas.org |
|
| NASA - Science@NASA |
| News and features about NASA research, aimed at the general public. Includes sections on astronomy, space science, beyond rocketry, living in space, ... |
| science.nasa.gov |
|
| Science NetLinks: Resources for Teaching Science |
| Resources for K-12 science educators. |
| www.sciencenetlinks.com |
|
| Cool Science for Curious Kids |
| Fun and interactive site to help kids appreciate science. Why are snakes like lizards, and monkeys like moose? Find out here. |
| www.hhmi.org |
|
| Welcome to the Science Museum |
| London museum and library of science. Exhibitions cover all areas of science and technology. Includes online exhibits and a learning area. |
| www.sciencemuseum.org.uk |
|
| New Scientist - International News, Ideas, Innovation |
| Weekly science and technology news magazine, considered by some to be the world's best, with diverse subject matter. Articles from current issue and ... |
| www.newscientist.com |
|
| CNN.com - Science and Space |
| Offers news stories related environmental issues, archeology, astronomy, technology, geology and other science topics. |
| www.cnn.com |
|
|