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Chapter 7 • Pointing the antenna
1037312-0001 Revision A
67
Isolating the transmit
signal
To prevent signal cross talk, you use a procedure known as
Automated Cross Polarization (ACP) to isolate the transmit signal
from the receive signal. ACP test functions are included in the
installation software.
The ACP software operates in two different modes—manual or
automatic. Manual mode gives real-time feedback of cross
polarization isolation measurements while you adjust the antenna.
Automatic mode takes a snapshot of the cross polarization
isolation measurement.
ACP fine pointing consists of testing using both the manual and
automatic modes and adjusting the antenna by small increments
(if necessary) until it passes both the manual and automatic ACP
tests.
Follow the general instructions below for the ACP tests. Use the
installation software screens to initiate tests and see the test
results.
Manual ACP test
First run a manual ACP test:
1. Lock down all antenna adjustment nuts and bolts.
2. Initiate the manual ACP test by selecting the manual cross
polarization test type.
If the manual ACP test passes, stop the test and proceed to
Automatic ACP test on page 68.
If the manual ACP test fails, let the test continue and follow these
steps:
1. Make small, 1 ° or less changes in polarization while
observing the transmitter isolation.
2. Peak the polarization to the highest possible transmitter
isolation.
3. Tighten the polarization lockdown nuts.
4. Check the signal strength.
When the manual ACP test passes, stop the test and proceed to
Automatic ACP test.