Hughes AN6-098P User Manual download pdf (Page 85)

Chapter 7 • Pointing the antenna

1037312-0001 Revision A

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.

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Hughes AN6-098P User Manual Page 85