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OPERATING THE ACU
A search pattern 1 or 3 will be initiated according to which GYRO TYPE is selected and
the existence of the gyro input.
Search 1: a search pattern 1 will automatically be initiated when the ship’s heading input
does not exist / fails.The antenna will go to the relative azimuth position 0° at the calculated
elevation and search in the azimuth CW and CCW direction in a turn rotation and search up +
0.5° & down -0.5° with a total 6 (±3°) in elevation. The search cycle will repeat until the anten-
na receives the lock signal from the receiver, or until the DVB transponder of the target satel-
lite is decoded by the antenna. If the desired signal is found and above the predened detect
level, the ACU will enter to Search 3. However, the antenna will not initiate Search 3 pattern
but go into TRACKING mode immediately if the desired signal is above the predened track-
ing threshold level. If the detected signal is below the predened tracking threshold level, the
search 1 will repeat and start 3° away from the current position.
Search 1 Antenna Motion
Target EL Angle 0°
Turn 1
Target EL Angle 0°
Turn 3
Target EL Angle + 0.5°
Turn 2
Target EL Angle - 0.5°
Turn 4
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