Promax SATHUNTER, Manual

Page: 51 / 80

SATHUNTER USER’S MANUAL.
09/2008 Page 19
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Measure units of power can be configured by software. Available values are:
dB
µ
V, dBmV or dBm.
Once the antenna is well positioned, if you wish to measure the MER on other
transponders of the same satellite that are memorised in the instrument, you can
change the test point by pressing the key [3] until you select the right one. If you
wish to measure the MER for other satellites memorised in the instrument, before that
you have to orientate correctly the antenna and then, change satellite pressing the key.
[3]. The variation between satellites and transponders depends on how you set the
table of channels loaded into the SATHUNTER .
In addition, the SATHUNTER can measure the VBER for DVB-S and the LBER
for DVB-S2 (see figures 12 and 13). In order to do this, the SATHUNTER should be
configured using the PROMAX software.
3)ADJUST
TP75 FR: 1314.0MHz
POWER: 82.2dBuV
MER: 11.4dB
8.9E-4
<1.0E-8
CBER:
VBER:
0 15
S 18
Figure 12.- DVB-S measurements with VBER .
3)ADJUST
TP75 FR: 1314.0MHz
POWER: 82.2dBuV
MER: 8.5dB
<8.9E-4
<1.0E-7
CBER:
LBER:
0 15
S2 18
Figure 13.- DVB-S2 measurements with LBER.
As time goes by, the DVB-S and DVB-S2 demodulator circuit tends to measure
better, due to it includes an input signal tracking and an adaptation algorithm. Therefore, to
ensure a good quality at reading signal, you should wait for some additional
measurements.