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RC4600 ACU Board Set
The EL field shows a current position value of the elevation axis. It also shows the status of elevation
limits (STOW, DOWN, UP). The limits will be displayed based on the table below. It is possible for
different limits to have different sources (Switch Hardware for Up and Down software for stow).
Switch Hardware +
Software Limits
Limit Reached
Hardware Limit
STOW, DOWN, UP
Software Limit
The elevation axis may be moved by pressing the <El UP> or <El DN> keys.
The value displayed may be changed by the <Scroll Up/Angle> CT key. The display will rotate between
showing local horizontal relative (EL) or platform relative (el) values.
The local horizontal relative elevation angle is calculated by taking the current platform relative azimuth
and elevation angles along with the pitch and roll of the mount. If there is currently no mount pitch and
roll. The local horizontal relative elevation angle will display the same value as the platform relative
elevation angle.
Following a LOCATE operation, the azimuth and elevation limit fields will display the target angles in
parenthesis. If a limit condition is active, the limit display will overwrite the target values.
PL:/pl:
The PL field shows a current angular value of the polarization axis. It also shows the status of
polarization limits (STOW, CCW, CW). The limits will be displayed based on the table below. It is
possible for different limits to have different sources (Switch Hardware for stow and Pot Based for CCW
and CW).
Switch Hardware +
Software Limits
Limit Reached
Hardware Limit
STOW, CCW, CW
Software Limit
This field will also show if the polarization axis has been placed at a predefined horizontal (H) or vertical
(V) position.
The value of the predefined horizontal and vertical positions depends on what mode was active prior to
entering the MANUAL mode. If a LOCATE operation occurred prior to MANUAL, the H and V values will
be those automatically calculated by the LOCATE mode. H and V will be defined according to the
reference defined in the POL CALIBRATION screen (ie. if REF = H, H = 0 & V = 90 if REF = V, V = 0 & H
= 90).
The polarization axis may be moved manually by pressing the <Pol CCW> or <Pol CW> keys. The axis
may also be moved automatically to the predefined horizontal or vertical positions by pressing the <H> or
<V> keys.
In the MANUAL mode, whenever the <5 H/V> key is pressed the polarization axis will automatically move
90 degrees from its current position. The target position for this automatic "cross polarization" movement
considers the user defined polarization axis limits. For example, if a cross polarization movement of 90
Software Limits
stow, down, up
STOW, DOWN, UP
Pot Based Hardware +
STOW, CCW, CW
stow, ccw, cw
Chapter 1
No Hardware +
n/a
Software Limits
stow, ccw, cw
24
Introduction
No Hardware +
Software Limits
n/a
STOW, CCW, CW
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