Constellation Diagram (Iq) - Promax -27 Manual De Uso

NOTE:
Access to the function SCAN / SPECTRUM switches depending on the type of
tuning you are doing.
In case you are tuning a signal using frequency, it will be displayed the
SPECTRUM function first.
In case you are tuning a signal using the predefined channels from the channel
plan, it will be displayed the SCAN function first.
4.2.3.1

CONSTELLATION DIAGRAM (IQ)

To access the IQ (Constellation Diagram) function:
1.- Press key
2.- Press softkey MODEM [F1].
3.- Press softkey IQ [F2].
It is the graphic representation of the Constellation Diagram (Figure 10.-) for DVB-
QAM digital signal. For details see Appendix B "Principle of QAM Modulation. The
constellation Diagram".
Measurements displayed on the screen:
PWR:
ATT:
FR:
BW:
Page 24
[13].
E/DOCSIS ANALYSER
UPSTREAM
99 28
PWR ATT
dBuV dB
FR: 27.05 MHz/01
BW: 3.3 MHz
MOD: QAM64
SR: 1280 ksym/s
ALL
STARTING
IP NETWORK DOWN SPECTRUM
Figure 10.- Constellation Diagram.
Uplink level power.
Attenuation until CMTS.
Carrier frequency and UCI.
Signal bandwidth.
USER'S MANUAL. PROMAX-27
LOGGER
09/2010