With some amazing similarities, satellite TV decoders are different from Ralphie's Little Orphan Annie decoder ring, otherwise they would probably tell the viewer to watch more satellite TV. To protect their proprietary programming, and insure all satellite users pay for the programming they receive, the satellite TV decoders not only unscramble the programs to which the users are subscribed, they also work in tandem with the unit's channel selector.
Satellite set top units all require the use of a programming card that is unique to the company as well as to the unit into which they are plugged. The card can be placed in any number of units, but each time it is installed in a different unit, the satellite provider will need to program it to the serial number of the unit. Satellite TV decoders are not intended to be used in more than one unit at a time and without the right one in the corresponding unit, the signal will not be processed.
Every satellite set top receiver is capable of receiving every channel being broadcast by any satellite provider. Similar to cable television, the signal are scrambled to protect their original source and to prevent hijacking of the signal by unauthorized users. The satellite TV decoders, programmed by the providers will only alloy signals for the subscribed programs to be passed on to the television.
Channel Selector Tells Card Which Signal To Send
Consider satellite TV decoders and the set top's tuner as being a large circle with a funnel effect at the bottom. The signals all enter the funnel but if they were all capable of coming out at the same time, the result would be a total mix up of the combined signals. The satellite TV decoders align the incoming signals and based on the channel selected by the viewer only allows that signal to pass through.
The set top box displays the channel number based on the position of the channel as it corresponds to the satellite provider's guide. If the box displayed the satellite TV decoders' interpretation of the signal, it would be a series of numbers unintelligible to human viewers. Working together with the tuner satellite TV decoders help the viewer select what they want to see.
There is a huge illegal market for satellite TV decoders that work in different units without needing programming from the provider, but these units are illegal and can be instantly rendered useless with the satellite company sending out a reprogramming signal that only affects the illegal cards.
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