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 limit conditions for each of the limit switches is:
Name Switch Position when the Limit is Active
Azimuth Stow Closed
Elevation Stow Open
Elevation Down Open
Elevation Up Open
For example, when the elevation down limit is active the elevation down limit switch should be
open.
Polarization Axis Interface
The RC3000A is designed to drive a low-voltage DC motor in polarization. The absolute
maximum allowed motor current is 12 Amps. The motor-gearbox can be protected from
excessive torque by OEM-specified resettable fuses in the drive system (specify desired
maximum motor current). The RC3000A supports both fast and slow speed polarization motor
movement. The motor controller employs dynamic braking.
The polarization motor interface for the RC3000B is based on a 12 volt DC motor which draws
less than 400 ma. Position sense is provided by a potentiometer in a manner similar to the
azimuth axis. When ordering an RC3000 for a new mount, the user should specify:
1) The total possible travel for the antenna in azimuth. (eg. +100 °)
2) Where the limits should be set. (eg. +90°)
3) The number of turns possible for the azimuth pot. (alternatively the pot manufacturer and
part number) (eg. 3-turns)
4) The gear ratio between the pot and the azimuth axis. (eg. 5:1)
The A version of the RC3000 supports a polarization Stow limit switch. The 3000 does not
support polarization limit switches. The user may provide these externally using micro switches
and steering diodes if needed. Some A versions support a fairing deploy switch rather than the
pol stow limit.
Flux Gate Compass Placement
The RC3000FG option employs an electronic compass to determine the vehicle's heading. The
flux gate senses the direction of the earth's magnetic field. The flux gate should be placed in a
location on the vehicle which is relatively free of external magnetic fields. Devices which
generate strong magnetic fields include electric motors, Air-conditioner units, high power
microwave amplifiers, microwave circulators and isolators, and power supplies. The flux gate is
typically placed at the highest point of the vehicle. A common wet compass may be used to help
find the best place on the roof of the vehicle for the flux gate. To use the compass the user
should stand on the roof of the vehicle and slowly lower the compass down to the proposed flux
(11 Seiten)
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