Filter
Top Products
RC3000 Antenna Controller Chapter 2 Installation
27
2.2.3 Drive Sense
J1 (DB-15 Female on backpanel) receives position sense from the azimuth and polarization
potentiometers and the elevation inclinometer.
Normally, it is not necessary to modify the sensors on the antenna. The antenna manufacturer should
insure that the antenna is compatible with the RC3000. This information is provided for informational
purposes only.
The directional sense of azimuth movement is defined as clockwise (CW) or counter-clockwise (CCW),
as viewed by an observer located above the antenna. On the controller, CW movement results in a
greater sensed azimuth position.
The directional sense of elevation movement is defined as UP when the RF look angle of the antenna is
increasing.
The directional sense of polarization movement is defined as CW or CCW, as seen by an observer
standing behind the antenna reflector looking ‘through’ the reflector at the satellite. See diagram in
section 1.3.7 – Polarization Control. The reference position for the polarization position angle is
vertical polarization for a satellite located at the same longitude as the antenna. In the northern
hemisphere, for vertically polarized satellites to the west of the antenna, the polarization deflection is
defined as CW relative to the reference position. In the northern hemisphere, the polarization angle
increases for satellites farther to the west. In some modes of operation the controller predicts the
polarization value required to align the antenna with a given satellite’s horizontal or vertical polarization
position. For this feature to function properly the antenna’s polarization directional sense characteristics
(defined by the polarization motor and position sensor) must be consistent with that of the controller.