9797A-27 C-Band TXRX
Setup
5-1
5. Setup
Below are basic steps to guide you in setting up the ACU for your specific antenna pedestal. Assure that the
Antenna Pedestal (ADE) has been properly installed before proceeding. Refer to the Setup section of you ACU
manual for additional parameter setting details.
5.1. Operator
Settings
Refer to the Operation chapter of this manual to set the Ship information. Latitude and Longitude should
automatically update when the GPS engine mounted above decks triangulates an accurate location, but you
may enter this information manually to begin. You will have to enter Heading of the current heading of the
ship, the Gyro Compass will then keep the ACU updated.
Set the Satellite information, for the satellite you will be using. The receiver settings are especially important.
At this point you should be able to target the desired satellite. Continue with the setup steps below to
optimize the parameters for your installation.
5.2. Optimizing
Targeting
The easiest method to determine what amount of trim you need is to assure all your Ship & Satellite settings
are correct. Target the desired satellite, immediately turn Tracking OFF and record the Antenna Azimuth and
Elevation positions (Calculated Position). Turn Tracking ON, allow the antenna to “Search” for the targeted
satellite and assure that it has acquired (and peaks up on) the satellite that you targeted. Now, record the
Antenna Azimuth and Elevation positions while peaked on satellite (Peak Position). Subtract the Peak
Positions from the Calculated Positions to determine the amount of Trim which is required. Refer to the ACU
Setup information to key in the required value of Elevation Trim. Continue with Azimuth trim, then re-target
the satellite several times to verify that targeting is now driving the antenna to a position that is /- 1.0
degrees of where the satellite signal is located. EXAMPLE: The ACU targets to an Elevation position of 30.0
degrees and an Azimuth position of 180.2 (Calculated), you find that Peak Elevation while ON your desired
satellite is 31.5 degrees and Peak Azimuth is 178.0. You should enter an EL TRIM value of –1.5 and an AZ
TRIM of +2.2.
5.3. Optimizing
Auto-Polarization
While peaked on your targeted satellite, assure that you are in Auto-Pol (POL TYPE = 0072) and set one of
your satellite receivers to view its signal level display. Go to the POL OFFSET parameter in the Setup menu
of the ACU. Default setting is 0030 and may be incremented, or decremented to adjust polarization while in
Auto-Pol mode. Each increment equals one degree of polarization rotation (0038 = +8 degrees), decrement
below 30 for minus polarization (0022 = -8 degrees). Adjust as needed to get the highest signal level (and
best signal quality) on your satellite receiver.
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