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DVB-S Theory

DVB stands for Digital Video Broadcast - Satellite. At its core, DVB-S is a simple mechanism. Digital transmitters beam sets of channels to an area, and they are received by antennas aimed at the transmitter. The scope of this article is to provide basic understanding of DVB-S technology, dish pointing and peaking, and setup in MythTV. In keeping with the philosophy of the (largely US based) MythTV development and user community, no discussion of prohibited activities (civil or criminal) is welcome at any time. If some activity utilizing DVB-S is legal in your locale, bear in mind that it is likely *not* so in the United States (under whose laws MythTV must exist) and is therefore *still* unwelcome in all official MythTV support channels.

DVB-S and DVB-T (Digital Video Broadcast - Terrestrial) share in common many characteristics. They both share in common a remote transmitter broadcasting a signal through the air to an antenna, with bundles of channels (multiplexes) being transmitted by one or more transponders. In the case of terrestrial broadcasts, the need for precise aiming is less critical as the transmitters are largely omnidirectional and within short distances. In the case of satellite broadcasts, however, the antenna (dish) must be aimed at an object the size of a schoolbus traveling at 11,000 kilometers per hour at a distance of 35,000 kilometers. Precise aiming is, to say the least, critically important.

Equipment Needed

Equipment Setup

Dish Aiming

Dish Peaking

MythTV Setup