RESEARCH CONCEPTS RC3000 Especificações descarregar pdf (Página 5)

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

Elevation Up Open

Elevation Down Open

Flux Gate Placement

The RC3000 antenna controller can obtain the vehicle’s heading from the optional flux gate compass (RC3000FG). A diagram

of the flux gate is included in the addendum (an unhoused version of the flux gate is also available). The flux gate senses the

direction of the earth's magnetic field. To ensure the greatest accuracy, the flux gate should be mounted in a location that is

free of magnetic fields and away from ferrous metals. Devices which generate magnetic fields include electric motors, high

power microwave amplifiers, microwave circulators and isolators, and power supplies. Note that current flowing through a

conductor generates a magnetic field – the strength of the magnetic field is proportional to the magnitude of the current and

inversely proportional to the distance from the conductor.

Ferrous metals located on the vehicle distort the earth’s magnetic field. For a vehicle, the distortion of the earth’s magnetic

field is generally such that the earth’s magnetic lines of flux tend to align themselves with the vehicle’s long axis. The flux

gate supports calibration routines that can partially compensate for the distortion of the earth’s magnetic field due to ferrous

metal in the vehicle itself and magnetic fields generated by equipment located on the vehicle.

Generally, the best performance is achieved when the flux gate is mounted as high as possible on the vehicle. The RC3000

can support placement of the flux gate on the antenna reflector. When mounted in this manner, the antenna must be raised

to a ‘deploy’ position before the vehicle heading can be obtained.

If the flux gate is to be placed on the roof of the vehicle (as opposed to the back of the antenna reflector), a common wet

compass may be used to help find the best location on the vehicle for the flux gate. To make the measurement it is

generally best if the vehicle is pointed in either a westerly or easterly direction. With the wet compass the user should stand

on the roof of the vehicle and slowly lower the compass down to the proposed flux gate mounting location. If the needle of

the compass experiences deviations as it is lowered to the proposed mounting location it indicates that there are either

external magnetic fields or concentrations of ferrous metals in the vicinity of the proposed flux gate mounting location. The

flux gate should be placed in the location on the roof of the vehicle where the compass experiences the least deviation.

When using the wet compass to determine flux gate placement be sure that all equipment which may be in operation when

the flux gate is used is turned on.

The GPS and Flux Gate Compass interface to the RC3000 via a DB-37 female connector (J9). A DB-37 male to two DB-9

(female) ‘Y’ cable provides an interface to the GPS and Flux Gate interface cables. The flux gate cable should be routed as

far as possible from electrically noisy devices and unshielded cables.

GPS Receiver Placement

The RC3000 can interface with an optional GPS receiver (designated RC3000GPS). The GPS receiver (with built-in antenna)

is housed in a weather proof assembly which must be placed on the roof of the vehicle so that the receiver has a clear view of

the sky when the antenna is stowed. See the addendum of this document for additional GPS mounting information.

The GPS and Flux Gate Compass interface to the RC3000 via a DB-37 female connector (J9). A DB-37 male to two DB-9

(female) ‘Y’ cable provides an interface to the GPS and Flux Gate interface cables. The GPS cable should be routed as far

as possible from electrically noisy devices and unshielded cables.

L Band Input

The RC3000 J11 (F type) connector accepts an L band signal from a satellite block down converter (950 to 1450 MHz, -50 to

–5 dBm). The controller’s L band input circuit provides a DC output voltage that is proportional to the power level of the L

band signal to the controller’s microprocessor. Note that there is a DC block (capacator) in series with the L band input.

The RC3000 can use the L band signal to perform an AutoPeak function (the analog signal strength inputs can also provide

signal strength information for the AutoPeak function). During an AutoPeak the controller performs a search. If a signal is

found the controller peaks the antenna on that signal. For a geostationary satellite the controller performs a line search in

azimuth (the elevation is periodically adjusted to nominal value if the platform is not level). For an inclined orbit satellite, the

controller performs a spiral search.

Analog Signal Strength Input

The RC3000 can accept 2 analog input voltages that are proportional to received signal strength via the J2 connector. Signal

strength information is required for inclined orbit satellite tracking and can optionally provide a source of signal strength

information for the AutoPeak function (see the section on ‘L Band Input’ section above).

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