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DiSEqC:
Digital Satellite Equipment Control: a digital control signal
used to control and switch DiSEqC compatible components of
the external installation via the antenna cable. An example of
how an installation consisting of DiSEqC components can be
configured is shown in (Fig. 10-1).
DVB:
Digital Video Broadcasting: A universal digital transmission
technology used to transmit pictures, graphics, sound and
text, as well as for data in every conceivable form and in
every possible, appropriate quality.
Frequency:
A physical unit of measurement, indicates the number of
oscillations per second, the unit of measurement is Hertz
(Hz)
Frequency range:
a) Satellite respectively LNC:
11 GHz range from 10,70 GHz - 11,70 GHz, 12 GHz range
from 11,70 GHz - 12,75 GHz
b) Receiver: interim frequency or 1.IF 950 tp 2150 MHz
Unit Name Oscillations per second
1 Hz 1 Hertz 1
1 kHz 1 Kilohertz 1.000
1 MHz 1 Megahertz 1.000.000
1 GHz 1 Gigahertz 1.000.000.000
Co-axial cable:
Connection cable between LNC and satellite receiver, used to
transmit the signals received and to supply power to the LNC.
LNB/LNC (Low Noise block converter):
Reception unit located at the focal point of the parabolic dish
antenna. Converts the frequency range of the satellite to that
of the interim frequency of the digital receiver.
LOF:
Local oscillator frequency; stated in MHz or GHz; varies
depending on the LNC and the frequency range
Reception frequency of the digital receiver = Broadcasting fre-
quency of the satellite - LOF
22 KHz modulation:
This can be used to switch between 2 LNCs, in addition to
14/28 Volt switching. In Universal LNCs it serves to switch to
the High range
Modulator:
Switch in the satellite receiver or video recorder used to con-
nect the television set via antenna cable
Parabolic dish:
Dish, made of metal or coated synthetics, with parabolic
shape, used to focus the electro-magnetic waves transmitted
by the satellite at a focal point.
Polarisation plane:
To better utilise the available frequency range, satellites trans-
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