Sea Tel DAC-2302 Installation Manual download pdf (Page 39)

Setup – Targeting 6009-33 Installation Manual

7-1

7. Setup – Targeting

In this lesson you will learn how to optimize the targeting of the antenna to land on or near a desired satellite (within +/-1

degree).

7.1. AUTO TRIM

The Auto Trim function will automatically calculate and set the required Azimuth and Elevation trim offset parameters

required to properly calibrate the antennas display to the mechanical angle of the antenna itself.

Refer to “Optimizing Targeting” in the Setup section of this manual for further details on the parameters set.

To enable this function, the Antenna MUST be actively tracking the satellite with positive SAT ID: After locating the

satellite wait at least 30 seconds before performing the AUTO TRIM feature, this will allow sufficient time for the

antenna to peak up on signal. It is equally important that you verify that the system is tracking the CORRECT satellite

(verify video is produced on the Televisions in a TVRO system or verify a RX lock indication on the satellite modem in a

VSAT system).

While in the AUTO TRIM sub-menu, press the LEFT arrow key to bring start the calibration procedure, the display

should read AUTO TRIM SETUP, press the ENTER key to submit. AUTO TRIM SAVED will be displayed, indicating the

proper AZ and EL trims were submitted to RAM. This does not save these parameters to NVRAM, in order to save to

memory, continue down through the setup mode parameters until the SETUP SAVE NEW PARAMETERS sub menu

is displayed. Press the RIGHT arrow and then press the ENTER key. The display should now report that the parameters

were saved.

NOTE: The AUTO TRIM feature only will work if your system is actively tracking a satellite (AGC above threshold

and

7.2. Manually Optimizing Targeting

positive SAT ID, internal NID match or external RX lock received, has been established). If any of the previous

conditions are not met, AUTO TRIM LOCKED will be displayed on the front panel, indicating that the AUTO TRIM

Feature is not enabled. From the AUTO TRIM SETUP screen, press any MODE key (DAC2302) or NEXT key (DAC2202)

without hitting ENTER to escape this screen without submitting the new AZ and EL Trim values.

First, assure that all of your Ship & Satellite settings in the ACU are correct.

4. Target the desired satellite, immediately turn Tracking OFF, and record the Azimuth and Elevation positions in

the “ANTENNA“ display of the ACU (these are the Calculated positions).

5. 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.

6. Allow several minutes for the antenna to “peak” on the signal, and then record the Azimuth and Elevation

positions while peaked on satellite (these are the Peak positions). Again, assure that it has acquired the

satellite that you targeted!

7. 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.

8. 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 within +/- 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 would

enter an EL TRIM value of –1.5 degrees (displayed as -0015) and an AZ TRIM of +2.2 degrees (displayed as 0022).

After these trims values had been set, your peak on satellite Azimuth and Elevation displays would be very near 180.2

and 30.0 respectively.

7.3. EL TRIM

Elevation trim offset parameter is entered in tenths of degrees. Adjusts display to correct for antenna alignment errors

or imbalances in the antenna system. Increase number to increase display. Refer to “Optimizing Targeting” in the

Setup section of your antenna manual.

To update: While in the EL TRIM sub-menu, press the LEFT arrow key to bring the cursor under the ones digit. Press

the UP or DOWN arrow key to increment or decrement the selected digit. Minus values are entered by decrementing

below zero. Use the LEFT or RIGHT arrow key to move the cursor left or right to select other characters to modify.

When you are finished modifying press ENTER to execute the new value OR press NEXT to abort and exit setup mode.

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Sea Tel DAC-2302 Installation Manual Page 39

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