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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 i
ntermediate 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