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Satellite TV dish antenna

For the reception of Direct Broadcast Satellite (DBS) home service, you need a small satellite TV dish antenna. Here, as "small" is considered anything bellow 40" in diameter. Dish antenna mounted at the subscriber's residence receives the signal emitted by a TV satellite.  From the dish, the signal is transferred to the satellite TV receiver and, finally, to the TV set.

DBS dish antenna is of so called "center feed" type, with a paraboloidal dish surface focusing radio waves from TV satellite onto the actual small antenna ( or feed) centered in front it. The assembly containing the feed is called feedhorn. Signal generated by the antenna is fed to the LNB unit.

      The LNB...

LNB stands for "low-noise block down-converter". It converts very high satellite signal frequency from the GHz (Giga-Hertz, billions cycles per second) range, or block, into MHz (Mega-Hertz, millions cycles per second) range. Sometimes the LNBF designation is used, which is merely a feedhorn with integrated LNB unit. The LNB also amplifies very weak satellite signal before it makes it to the satellite TV receiver. It is very important that the LNB unit contributes as little as possible of its own "noise" to the signal it amplifies.

    The noise produced by LNB is due to its operational temperature, creating thermal radiation effectively lowering the strength of received signal. LNB units have gone long way since the early days: today's LNB noise level standard is around 1dB (decibel), or less. The lower LNB noise level, the lower signal loss due to thermal waves interference, and the better signal quality.

Originally, DBS satellite dishes had a single LNB unit, thus limited to handling a single satellite input. Nowadays, they come with up to 5 LNB units mounted on so called "multi-satellite" dishes. A dual-feed LNB unit has its potential channel capacity doubled, due to being handling both polarization modes (polarization is splitting one same frequency in two modes, so that each mode can be independently used for transmission). It is not to be confused with "dual band" LNB, capable of transmitting two different frequency ranges.

In general, the more LNB units, the more satellites covered, and the more receiver outputs. It all translates into more programming per single or multiple TV sets available. Satellite mini-dish properties vary somewhat between the two providers, DirecTV and Dish Network in both, standard and specialized dish forms. Free installation normally covers the standard mini-dish type. 

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Direct Broadcast Satellite  Direct Broadcast Satellite (DBS) TV service is a high-powered broadcast service to homes using satellites as the primary form of signal transmission. Its high transmission power makes possible use of relatively small dish antennas for efficient signal reception and utilization. Commercial satellite TV, as we know it, is a DBS service...

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DirecTV  DirecTV is a direct broadcast satellite (DBS) service provider, based in Las Vegas, Nevada. Launched in 1994 by Hughes Electronics Corporation, it was the very first high-powered (mini-dish) DBS service in the world...

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Satellite Radio  If you like listening to radio programming, satellite radio has some goodies to offer. Great variety of channels, most of them commercial-free, high quality sound when it is needed, possibility to listen to your favored programming wherever you are...

 News Wire  The latest in the satellite/cable industry...

 

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