Signal Guide

Service Description Selection DVB

Here you will find information about the selected service, along with measurement examples.

DVB Theory & Details
Broadcast
Typical Frequency Range:

10,7 – 12,75 GHz (DVB-S / DVB-S2),
342 – 470 MHz, 606 – 862 MHz (DVB-C),
UHF-Band IV (DVB-T)

General:

DVB (digital video broadcasting) was developed in the 1990s by a consortium of program providers, device manufacturers, network operators and authorities in order to offer more TV channels with better definition (HDTV) as well as other services. The following variants exist: DVB-S / DVB-S2 (satellite), DVB-C (cable), DVB-T (terrestrial) and DVB-H (handheld). DVB is standardized by ETSI.

Modulation: OFDM, QPSK, QAM

QPSK (DVB-S), 8-PSK or APSK (DVB-S2), 64-QAM or 256-QAM (DVB-C), COFDM with QPSK or 16-QAM or 64-QAM for individual carriers (DVB-T). COFDM systems use OFDM modulation with forward error correction.

DVB Measurement Examples
Spectrum
DVB-T extract from the UHF band shows moderate amplitude dips caused by reflections, which can be compensated for by error correction.
Spectrogram
HiRes Spectrogram Full
Overview measurement of a DVB-T channel over about 18 ms. The amplitude dips are constant and correspond to those seen in the Spectrum.
HiRes Spectrogram Zoom
The section from HiRes Spectrogram Full gives no additional information.
Persistence Spectrum
Light density display from the same data as HiRes Spectrogram Full. Can reveal irregularities in evenly distributed digital signals.
Magnitude
Scope
Shows no information because DVB-T is transmitted on UHF as a continuous signal.