Chapter 11 VisionMaster Ship’s Manual
Antenna Speed Selection Input Additional Features
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2.9 Antenna Speed Selection Input
An isolated closing contact can be connected to the X-band turning unit to
enable remote selection between normal and high speed antenna rotation.
In the absence of the closing contacts, links are used to preset the rotation
speed to normal or high speed.
Note: This function cannot be used in conjunction with the Forced Antenna
Rotation in Standby feature.They are mutually exclusive.
For 10kW DC systems, high-speed operation should only be used
where a 1.2m (4ft) antenna is fitted to the Turning Unit. For 1.8m (6ft)
and 2.4m (8ft) antennas the antenna rotation speed must be preset to
the Normal setting.
Table 14: Antenna Speed Selection
Parameter Value
Antenna Speed Normal 28 rpm nom.
Antenna Speed High 45 rpm nom
Control Signal Type Uncommitted closing contact
Signal Sense Closed contacts select 28rpm
Open contacts select 45rpm
Voltage Applied to Open Contact < 5.5V DC
Sink Current Through Closed Contact <500μA
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