Intellian v240M - Page 80

v240M – Marine Satellite Communication System
80
-3°
-2°
-1°
0°
1°
2°
3°
1 5 10 15 20 3025
Search1
(Gyro-Free
Search Pattern )
Revolution (AZ direction)
EL direction
A search pattern 1 or 3 initiates according to the existence of a gyrocompass input
and which GYRO TYPE is selected.
Search 1: a search pattern 1 automatically initiates 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 CCW direction
and search up + 0.5° & down -0.5° with a total 6 (±3°) in elevation. The search
cycle will repeat until the antenna receives a lock signal from the modem or the
DVB transponder of the target satellite is decoded by the antenna. If the desired
signal is found and is higher than the predened detect level, the ACU will then
initiate Search 3. However, although ACU initiates Search 3 with the detection of the
desired signal, the antenna will not initiate Search 3 pattern but go into TRACKING
mode immediately. If the detected signal is below the predened tracking threshold
level, the search 1 will repeat and start 3° away from the current position.