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DVB-T
Abbreviation for Digital Video Broadcasting Terrestrial = terrestrial digital television. TV
reception is only possible in DVB-T transmission zones.
UHF-Channel
Number given to a frequency band. In UHF, the channels are numbered from 21 to 69.
Transmitter
Pylon crammed with antennas which retransmits channels (digital or analogue) and to
which the directional antenna should be directed.
Note:
a transmitter does not necessarily have to transmit all available channels.
EPG
Electronic programme guide, offering brief content and information concerning receivable
TV programmes incl. details such as name as well as starting and finishing time of given
programme.
Multiplex
Programmes and other services (e.g. data services) transmitted simultaneously and com-
bined to form a multiplex.
Digital
Nature of signals utilised in modern transmissions. Compared to analogue, digital clutters
the spectrum less (all available frequencies). With constant bandwidth, digital broadcasts
more channels than analogue. Digital channels have been in existence for several years on
cable and satellite.
In time they will replace analogue channels in ground transmission.
Note:
: the same channel can be transmitted in both analogue and digital form.
Polarisation
Orientation of the wave transmitted by the transmitter. The majority of UHF emissions are
horizontal. The legs of your directional antenna must therefore be horizontal.
Guard Interval
In order to use all same channel signals and reflections not arriving at the receiver simul-
taneously, the first part of the transmitted signal is not used for data transmission. This
part is called the guard interval and can be set to various lengths such as 1/4, 1/8, 1/16
or 1/32.
QAM (Quadrature Amplitude Modulation)
– modulation standard for cable reception.
QPSK (Quadrature Phase Shift Keying)
– modulation standard for satellite transmission.
Plawa_06_004_Bedinungsanleitung_4_engl2 10.05.2006 10:09 Uhr Seite 21
