Satellite HD Receiver

A satellite television is one in which there is a satellite dish and a box in order to receive the signals.  Through satellite television, many channels and services are received that may not be able to be provided by the providers of cable television.

The programmers of satellite TV get their programming from a total of two big sources.  They use international channels, including CNN, ESPN, and HBO, along with some local channels.  The majority of their international turnaround channels will give them the programming, so in many cases, these providers will include these special channels in order to attract customers.  Usually the broadcast center for the company will make use of big satellite dishes in order to get the digital signals and analog signals from different sources. 

The purpose of the broadcast center is to convert programming into a digital stream that is of high quality and that is not compressed.  The stream has much data for every channel.  In order for the signal to be transmitted, the broadcast center needs to compress the signal or it would not be able to be handled by the satellite.  The MPEG-2 video format which is compressed will be used in order to store movies from the DVDS.  This allows the stream to be compressed.  Without this, satellite HD would not be successful.  Using digital compression, around two hundred channels can be transmitted by a normal satellite.  Yet without this, only around thirty channels can be transmitted successfully. 

Once the video has been compressed, then the provider has to encrypt it so that other individuals who are not subscribers to the company can not access it without paying for it.  The process of encrypting it will involve scrambling this data so that it can only be decrypted in the case of the receiver having the right decoding satellite receiver with the decryption algorithm as well as the security keys that are necessary.  After the signal has been compressed and is encrypted, the broadcast center will send it directly to a satellite.  Then the satellite will pick up the signal, will amplify it, and will then send it back to Earth.  Here the subscribers will be able to obtain the signal and watch tv. 

The satellite dish is a certain type of antenna that has been created in order to support a certain source for broadcasting.  The typical dish will have surface that is shaped like a bow and a horn for central feed.  In order for a signal to be transmitted, a controller will send it on through this horn; then the dish will focus this signal into a really thin beam.  The dish that is on the end receiving the signal is not able to transmit any information.  It is only able to obtain the information.  This means it works in the opposing way to the transmitter.  Therefore, when the beam collides with the dish, the bowl shape will reflect the signal on inside to a certain point.  The dish then focuses the radio waves that are coming in onto the feed horn.  The feed horn is the point, and this passes the signal to the equipment receiving it.  The dish should be able to obtain a signal that is clear.  Yet in some of these systems, the dish will have to pick up the signals from at least two satellites at this same time.  These satellites can be close together so that a regular dish that has just one horn will be able to obtain the signals from both of them.  Yet this will also compromise the quality to a certain degree since the dish is not aimed at one of the satellites or more.  There is a new dish design that will make use of two horns or more in order to obtain different signals from satellites.  While the beams from the differing satellites will hit the dish that is curved, they will reflect at angles that are different in order for one beam to be able to hit one of the horns and for the other beam to hit the other horn.  The feed horn has a low noise block down converter, and this will amplify the signal that comes off the dish and will be responsible for filtering out the noise.  Then this converter will pass the signal that is filtered and amplified into the house of the consumer and to their satellite hd receiver.

The final part of the satellite tv system is the receiver part.  This receiver has several jobs.  First, it will descramble the signal that has been encrypted.  For it to be able to accomplish this, the receiver will have to have the appropriate decoder chip for that package of programming.  The satellite provider is able to communicate with this chip, using the satellite signal, in order to make the changes to the decoding programs.  This provider may also send some signals that will disrupt descramblers that are illegal.  It will use the MPEG-2 signal and then convert it to a format of analog that a standard television is able to recognize.  Because the receiver will put out just one channel at one time, you will not be able to tape a program while watching a different program.  You will also not be able to watch two different programs on two different tvs that are hooked to just one receiver.  Now this is able to be accomplished with standard digital cable providers, so in order to accomplish this with satellite tv, you will have to buy another receiver.  There are some other features too that some receivers have.  Some receivers have lock out options that parents can control, and some also have digital video recorders which will allow you to pause television that is live and to also record it onto a hard drive.  Digital satellite is still behind traditional cable in some of the basic features that are offered, but it is coming along.