User Manual:Setting up DVB-T (terrestrial)

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DVB-T Theory

DVB-T stands for Digital Video Broadcasting - Terrestrial. The scope of this article is to provide basic understanding of DVB-T and how to setup in Mythtv. DVB-T signals are typically broadcasted by TV towers (like TV towers for analogue reception) on VHF and UHF frequencies over the air. DVB-T signals can be part of the VHF or UHF spectrum, co-existing next to analogue signals. However, many countries are switching these days to digital broadcasting and fully abandoning analogue TV broadcasting. Reasons for switching to digital broadcasting are better picture quality, lower transmitting power needed and the possiblities for Conditional Access (Pay-TV or legal rights) and HDTV.

DVB-T and DVB-S (Satellite) share in common many characteristics. They both share a common a transmitter broadcasting a signal through the air to an antenna/aerial, with bundles of channels (multiplexes) being transmittted by on or more transponders (a frequency on which can be tuned). So, if tuned to a specific frequency , it is possible to receive more than 1 channel on this specific frequency. In contrary to satellite reception, it is not needed to precisely aim to a transmitter. DVB-T signals are all around and can be received using a simple indoor antenna (i.e. a vertical rod) when the transmitter is nearby, or a more sophisticated outdoor antenna in case the transmitter is remote. It is possible to receive DVB-T from a transmitter over a distance of 100 kilometer without problems.