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Coax cable:
Cable connection between the LNB and satellite receiver which is used to transfer the received signals and for the
power supply of the LNB.
LNB (Low Noise Block Converter):
Receiving unit centred in the focus of the paraboloidal reflector.It converts the frequency range of the satellite into
the intermediate frequency of the receiver.
LOF:
Local Oscillator Frequency; specified in MHz or GHz,depending on the LNB and the received frequency range.
Receive frequency of the receiver = Broadcast frequency of satellite - LOF
Correlation between frequency range and LOF:
11 GHz range LOF 9.75 or 10 GHz
DBS range LOF 10.75 GHz
12.5 GHz range LOF 10.75 or 11.475 GHz
Modulation at 22 kHz:
Additional control signal,e.g.for an external switching device used to toggle between two LNBs.
Modulator
Electronic circuit in the satellite receiver or video recorder which is used to connect to a television via antenna cable.
Mode:
determines if a channel is received in mono or stereo quality.
Multyfeed:
Outdoor unit consisting of a paraboloidal reflector and multiple LNBs for the reception of multiple satellites.
OSD:
„On-Screen Display“; alphanumeric representation of information on the TV scree
Offset reflector
Special type of paraboloidal reflector which is primarily used for small to medium-sized reflectors.
Paraboloidal reflector:
Reflector of paraboloidal shape made of metal or plastic-coated which is used to focus the electromagnetic waves
which are broadcast by a satellite.
Polarisation level:
For an efficient use of the available frequency range satellites broadcast adjacent channels with opposite polarities
(alternately horizontal and vertical,or left-moving and right-moving).The reception of both polarisation levels requires
two single LNBs or a V/H LNB.
Polarizer
An equipment which is used to switch the polarisation levels by means of an actuator motor drive (mechanical) or
through a direct current (ferrite or magnetic).This allows the reception of both polarisation levels over a single LNB.
Radio channels:
Apart from the television channels,satellites also broadcast radio channels which are transported on subcarriers.In
addition to the subcarrier’s frequency further parameters have to be set:
Audio bandwidth, Deemphasis,and Mode.
Receiver:
See satellite receiver.
Satellite:
Name and position of the satellite relative to the orbit,e.g.:
Name: Eutelsat Position: 13° East or -13°
Telecom 2B 5° West or +5°
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*M-Focus 2.6.95 14.12.1999 10:39 Uhr Seite 44