Sea Tel ST94-21 Installation And Operation Manual Download

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ST94-21 C/Ku-Band TVRO

Setup

11-1

11.

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.

11.1.

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. If your gyro source is providing Heading information in any format other than

NMEA-0183 format, you will have to enter in the initial Ship’s Heading position, 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.

11.2.

Optimizing Targeting (Auto Trim)

The following feature requires your antenna have GSR2 minimum software versions installed. First, assure that all of

your Ship & Satellite settings in the ACU are correct. Target and, if required manually locate the desired satellite.

Allow 1 to 2 minutes for the antenna to “peak” on the signal. Verify positive satellite identification, in a TVRO system

verify either Receive NID or that at least one Television is producing video, in a VSAT system verify receive lock
indication on the satellite modem.
Access the ACU Setup Mode Parameter “AUTO TRIM”, Press the UP arrow and then press Enter.
Drive the antenna completely off satellite (Target and Azimuth value of 0)
Retarget the satellite and verify the system peaks on satellite with positive satellite identification within 1 minute.
Access the ACU Setup Modes “SAVE NEW PARAMETERS”, Press the UP arrow and then press Enter

11.3.

Optimizing Targeting (Manually)

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

enter an EL TRIM value of –1.5 degrees and an AZ TRIM of +2.2 degrees. 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.

11.4.

Radiation Hazard and Blockage Mapping (AZ LIMIT parameters)

This system may be programmed with relative azimuth and elevation sectors (zones) where blockage exists or where

transmit power would endanger personnel who are frequently in that area.
Refer to your ACU Manual for instructions on programming of these zones.

EAR Controlled - ECCN EAR99