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RC4600 ACU Board Set
Chapter 2
Hardware
3.2.2 Polarization Control
The RC4600 calculates the required position and automatically moves the polarization axis as part of the
satellite LOCATE function. The following diagram shows the polarization axis sign convention used. The
diagram depicts looking at the arc of satellites from behind the antenna.
The RC4600 allows the user to specify the type of polarization axis mechanism present. If a circular
polarized feed is present, no automatic movement of the polarization axis is performed. If a linear
polarized feed is present, the RC4600 will calculate the theoretical position as a function of the antenna
position (latitude/longitude, heading, pitch/roll) and satellite longitude.
3.2.3 Drive System
The RC4600 implements several mechanisms for the driving and monitoring of the azimuth, elevation and
polarization axis.
3.2.4 Position Sensing and Limits
The RC4600 senses absolute axis position using feedback from various sensors (potentiometers,
resolvers, encoders, etc). The sensed information is scaled appropriately for the particular antenna. This
sensed position is displayed in angular format.
The boresight of the antenna is displayed for the azimuth and elevation axis. In elevation, this angle is
with respect to the local horizontal. In azimuth, this angle is with respect to the centerline of azimuth
travel.
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