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HD RANGER 2

HD RANGER 2 Constellation diagram

COFDM constellation

Detecting signal impairments at a glance

The constellation diagram is a graphic representation of the digital symbols received over a period

of time. There are different types of constellation diagrams for the different modulation modes.

DVB-T/T2, DVB-C/C2 and DVB-S/S2 constellations are available on the HD RANGER 2.

8PSK and QPSK constellation

Looking at the satellite case

In the case of an ideal transmission channel, free of noise

and interferences, all symbols are recognised by

the demodulator without mistakes. In this case, they are

represented in the constellation diagram as well defined

points hitting in the same area and forming a clear dot).

16, 32, 64, 128, 256 QAM constellation

Using the Cable TV modes

Every modulation type is represented differently. A DVB-C

16QAM signal is represented on the screen by a total of

16 different zones, and a DVB-C 64QAM is represented

on the screen by a total of 64 different zones and so on.

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Promax HD Ranger + Manual do Utilizador Página 12