Digital Satellite TV
It is a point of fact that digital satellite TV services are powered by those elusive balls of technology, satellites. The Digital Satellite TV System transmits signal with the help of the communications satellite and either the terrestrial satellite dishes receive these signals or the set-top box installed with the television set. The Digital Satellite Cable TV runs on the same technology but there is only one terrestrial satellite dish serving several customers. Similar to the digital satellite TV, the signals are received by a satellite dish which is managed by a multiple service operator (MSO). The signals are then sent to the individual customers via cables. The Digital Satellite TV Dish has become popular in those areas where there is no service available pertaining to the satellite cable TV.
The satellites used for transmitting television signals are of two types, the highly elliptical orbit inclined at +/- 63.4 degrees with an orbital period of around 12 hours and geostationary orbit positioned around 37,000 km above the earth’s equator. Said satellites have around 32 transponders specifically for Ku-band and nearly 24 transponders for a C-band. Hybrid satellite can have more than 32 transponders.
A typical transponder has a bandwidth range of 27 MHz and 50 MHz. Each of the geo-stationary C-band satellite is to be spaced 2 degrees apart in order to avoid any kind of interference between them. This bandwidth is also vulnerable to terrestrial interference. For the Ku band they can be placed a degree apart. This particular band of transmission is highly affected by rain. Water absorbs microwaves of this particular frequency very well.
For satellite television the digital satellite TV receiver acts as an receiving antenna. The systems begin operation with the help of a transmitting antenna installed at a particular unlinking facility. The signals are directed towards the satellite and it is sent back in the direction of the receiving dish. The receiving dish or antenna is parabolic is shape. The downlink signals coming from the satellite are very weak so the parabola helps the signals to intensify at a focal point. A device called the feed horn collects the signals.
Digital Satellite TV Services and More
Most of the satellite TV service consumers get access to the TV programs through the direct broadcast satellite service provider, such as direct to home (DTH) platform or dish TV. The service providers decide on programs to be broadcasted to the subscribers as a basic package. Generally the service providers aim at bringing in as many channels to the customers to remain in the competition with the cable TV providers. This would require a fixed monthly or annual subscription charge to be given to the service providers also known as Free Digital Satellite TV. You can get even more channels and packages with the help of Digital Satellite TV Card. This is a system of payment, which enables you to buy a card containing the monthly subscription for a particular set of channels, and the price depends on which set you choose to buy. The transmission is completely digital, so the quality of image and sound are very high.