11 Technical terms
Antenna cable:
Cable connection between the modulator of the satellite receiver and the antenna input of the television set. Used as an alternative where no SCART socket is available
External unit or installation:
Description used for the entire system of components located outdoors, consisting of the parabolic/offset dish as well as one or more LNBs used to receive signals from one or seve- ral satellites
AV: see SCART
Data compression/MPEG1/MPEG2:
To transmit the current television standard (625 lines and 50 Hz image refreshing frequency), one arrives at a digital data volume of 216 MBit/s.
This would require bandwidth that is not available for either terrestrial or satellite transmission. Therefore, the data is reduced to decrease the volume of data. For Europe, MPEG- 2 has been determined as the international standard for data compression. MPEG2 is an expansion of MPEG1
DiSEqC:
Digital Satellite Equipment Control: a digital controlling/swit- ching signal for controlling
DVB:
Digital Video Broadcasting: a universal digital broadcasting technology suitable for pictures, graphics, sound and text, thus for data in any shape or form, and in all possible levels of quality, always appropriate for the content.
Frequency:
Physical measurement, indicates the number of oscillations per second. The unit of measurement is the Hertz (Hz)
Unit | Description | 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 |
Frequency range: a) Satellite resp. LNB:
11 GHz range from 10,70 GHz - 11,70 GHz, 12 GHz range fromn 11,70 GHz - 12,75 GHz
b)Receiver: Intermediate frequency, or 1. IF 950 to 2150 MHz
Co-axial cable:
Connection cable between LNB and satellite receiver, to transmit the signals received, and to provide electrical current to the LNBs.
Example:
A | B | A | B |
Position | Position | ||
output | output | ||
AB
Option
output
(Fig.
99