Cofdm Constellation Diagram - Promax PROLINK-4/4C Premium Manual De Instrucciones

4.9.1.5.6 COFDM Constellation Diagram

To select the COFDM Constellation Diagram mode:
1) Select the TV operating mode. If present operating mode is the spectrum analyser
mode press key
2) Select the terrestrial band for the measurement of COFDM modulated signals.
Available frequency ranges are:
COFDM signals
3) Select the DIGITAL operating mode by means of the key
4) Select the BER (COFDM) measurement mode: to do this press key
and turn the rotary selector [4] to select the BER (COFDM) measuring mode,
next, to activate it press the rotary selector [4] or key
Before visualizing the representation of the Constellation Diagram is necessary to
define some parameters concerning the digital signal (see section '4.9.1.5.2 Measuring
BER of COFDM Digital Channels (COFDM)' ).
5) Press the rotary selector [4] to access the functions menu in digital mode, and
select the Constellation option to access the Constellation Diagram screen. Turn
the rotary selector [4] to select the carrier and by means of key
turning the rotary selector [4] to tune the DVB-T (COFDM) digital signal to be
graphically shown.
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QAM
64 QAM
6875 kSymb
400.00 Mhz
MER= 19.7
BER= 1.0E-2
Figure 29.- QAM -Constellation Zoom function.
[21].
40 MHz to 862 MHz
USER'S MANUAL. PROLINK-4/4C
[22].
Premium
[20].
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and
06/2005