RESEARCH CONCEPTS RC3000 Spezifikationen PDF herunterladen (Seite 4)

Quantity Units Example Value

Total range of antenna movement about

the axis.

Degrees +/- 155 degrees of azimuth movement

Total number of potentiometer turns. Whole turns and degrees. 10 turns, tolerance: + 0 degrees, - 10 degrees

Ratio of movement about the antenna

axis to potentiometer movement

A ratio, 1:x (x greater than

If 310 degrees of azimuth movement results in 5.6

turns of the azimuth potentiometer the ratio is 1:x,

where x equals (5.6 x 360) / 310 or 1:6.503.

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 polarization movement is also defined as CW or CCW as seen by an observer standing behind the

antenna reflector looking ‘through’ the reflector at the satellite. 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.

The elevation position sense circuit of the RC3000 is designed to interface to the Lucas/Schaevitz AccuStar model 0211

1002-000 or 0211 1102-000 inclinometers (abbreviated data sheet included in the appendix). The inclinometer’s position

reference is marked on the body of the inclinometer. The inclinometer should be mounted such that the body of the

inclinometer is rotated CW (as viewed by an observer looking at the front of the inclinometer) as the antenna’s elevation angle

increases. The inclinometer must also be oriented properly on the antenna mount.

To describe the orientation of the inclinometer, the term ‘elevation offset angle’ needs to be defined. Elevation offset angle is

defined as the antenna’s RF elevation pointing angle (relative to horizontal) when a straight edge oriented vertically across the

face of the antenna reflector (reflector top to bottom) is plumb. The inclinometer should be oriented so that when the antenna

reflector is plumb the reference mark is deflected CCW (from the vertical position) by an amount equal to the 35 degrees

minus the ‘elevation offset angle’. If the inclinometer is attached as described the sensor will operate in its most accurate

region for elevation look angles up to 80 degrees. A paper entitled ‘RC3000 Inclinometer Orientation’ describes the

inclinometer orientation in more detail.

The inclinometer mounting flange allows for some adjustment of the device’s rotational orientation. The mounting position

selected for the inclinometer should allow for adjustment of the inclinometer’s orientation. The inclinometer should be

mounted in a location such that it is protected somewhat from blowing rain.

Connector J1 (DB-15 Female) interfaces the position sensors to the controller. The cables used to interface the controller to

the position sensor should be shielded and the shields should be connected only at the controller end of the cable assembly.

A schematic showing the sensor connections is given in the appendices.

Limit Switches

The RC3000 supports azimuth stow, elevation stow, elevation up, and elevation down limit switches. Azimuth cw/ccw and

polarization cw/ccw limit indications are derived from the azimuth and polarization position sense voltages produced by the

potentiometers. If failsafe limits are required for the azimuth and polarization axis they can be implemented with limit

switches and steering diodes. Contact the factory for more information.

If the azimuth stow limit is not active, the antenna can only be moved in elevation between the down limit and up limit. If the

azimuth stow limit is active, the antenna may be moved in elevation between the elevation stow limit and the elevation up

limit. When the antenna is below the elevation down limit the antenna may not be moved in azimuth or polarization.

The RC3000 optionally supports another limit switch that may be used to indicate polarization stow or antenna deploy

status. The RC3000 does not support polarization limit switches. The user may provide these externally using micro

switches and steering diodes if needed.

The following table describes the limit switch logic …

Limit Switch Limit Switch Contact Configuration When Antenna Is AT The Limit

Azimuth Stow Closed

Elevation Stow Open

1 2 3 4 5 6 7 8 9 ... 16 17

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