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Intermediate Frequency (IF):
The frequency range broadcast by a satellite cannot be transmitted via a cable connection.
The LNB thus converts the signal to an interim frequency range of 950 to 2050 MHz, which
enables the signal to be received and processed by the receiver.
1. IF = Interim Frequency,
LNB/LNC (Low Noise Block converter):
The receiving unit at the focal point of the parabolic dish antenna, it converts signals from
the frequency range of the satellite into the intermediate frequency of the receiver
LOF:
Local oscillator frequency, stated in terms of MHz or GHz, varies according to LNB as well as
according to the frequency range received.
Reception frequency of the receiver = Broadcast frequency of the satellite - LOF
Modulation at 22 KHz
This, in addition to 14/18 Volt switching, serves to switch between two LNBs. In Universal
LNBs it serves to switch to high band
Modulator
Switching mechanism in a satellite receiver or video recorder, serves to facilitate connection
via antenna cable
Mode:
determines whether a mono or stereo programme is received
Multyfeed:
External unit, consisting of one parabolic dish and several LNBs, used to receive signals
from several satellites
Parabolic dish antenna:
Dish formed in parabolic shape, made of metal or coated synthetic material, focuses the
electromagnetic waves received from a satellite in a focal point (where the LNB is mounted)
Polarisation plane:
In order to better utilize the frequency range, satellites broadcast neighbouring programmes
with opposite polarization (horizontal and vertical, or dextro-rotatory and laevo-rotatory). In
order to receive both polarisation planes one needs either two single LNBs or one V/H-LNB.
Receiver: see Satellite receiver
Satellite:
Description of satellite, usually a name in conjunction with the orbital position,
ASTRA 19° East
EUTELSAT 13° East
Satellite receiver:
The signals received and converted by the LNB cannot be processed by the TV set. The
satellite receiver modulates and processes them in such a way that audio and video signals
(AV) are created at its outputs, which are fed on to the TV set.
SCART:
Connector plug/socket found on TV sets, video recorders, satellite receivers and other home
electronic equipment, used to transmit audio (sound) and video (picture) signals (AV).
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