CPI and 1dBcP Compression Point Test
Setup Procedure
7-20
Ocean TRx™ 4500 Installation and Operations Manual
7.8
CPI and 1dBcP Compression Point Test
Perform Cross Polarization Isolation (CPI) test and 1dBcP compression point test with the
NOC and verify proper operation. If necessary, modify the system parameters according
to your satellite operator’s input, according to the procedure described in this section.
To perform the CPI and 1dBcP tests
1. Contact the satellite operator and set the modem for CW carrier transmit on
test frequency.
2. If needed the satellite operator will require adjusting the TX power level. Control the
modem to do that. If necessary change the BUC attenuation to adjust the gain of the
system.
3. The satellite operator should verify that the Cross polarization isolation (CPI) is above
the limit(typically >30db)
4. If the isolation is not sufficient:
From the
Config
menu, select
Operation Mode
and click
Manual
. The Manual
Mode configuration dialog appears.
Figure
7-22: Manual Operation Mode Dialog
Set the
Type
.
Change the
PolSkew
range the polls queue one step at a time (eg. 0.5 deg) until
the satellite operator verifies the correct signal level.
Note down the Poll Skew change.
5. Configure the axes parameters:
From the
Config
menu, select
Axes
parameters.
