TechniSat S1 Data compression/MPEG1/MPEG2, Frequency range, Co-axial cable, KHz modulation

Bed_anl_.qxd 20.02.04 16:29 Seite 63

Data compression/MPEG1/MPEG2:

The current television standard (625 lines and 50 Hz picture repeat frequency) provides a digital data volume of 216 MBit/s.

This would require bandwidths simply not available either ter- restrially or via satellite. The data volume is thus reduced by means of a data reduction system. For Europe, the internatio- nally determined standard for data compression is MPEG-2. MPEG-2 is an expanded version of MPEG-1

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 frequency 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

(Fig. 9-5)

(Fig. 9-6)

(Fig. 9-7)

(Fig. 9-8)

(Fig. 9-9)

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