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RC4000 ACU Boardset
3.3.1.2.3 Azimuth Calibration
VREF:2.50
CCW:-200.0
PSF:10431
ZERO DEG VOLTAGE <1.00–4.00 VOLTS>
VREF:
ZERO DEG VOLTAGE <1.00-4.00 VOLTS>
The azim_zero_voltage defines the voltage present when the azimuth axis is in its center of motion. See
Azimuth Calibration in
section
OFF:
ANGLE OFFSET <+/-90.0 DEGREES>
The azim_cal_offset item specifies the number of degrees to offset the heading reading with respect to
the heading of the centerline of the azimuth axis. The default value for this reading is 0. A value other
than 0 may need to be entered to correct for some mechanical misalignment in the system (see
and Elevation Alignment
CCW:
CCW LIMIT <+/-300.0 DEGREES>
CW:
CW LIMIT <+/-300.0 DEGREES>
These items specify the antenna's azimuth range of travel relative to the antenna's center azimuth (0.0)
position. These positions are used to trigger the display of the Reposition Truck message. When the
RC4000 calculates an antenna pointing solution in LOCATE mode, it checks these values to see if the
dish can be physically moved to that position. Thus the Reposition Truck message is displayed when the
antenna is incapable of moving to the azimuth position required to intercept the desired satellite. These
values are also used by autopeak algorithms to limit the area the autopeak movements will search.
Note that these values may also be used to actually limit the motion of the antenna.
should be set to the azimuth position which is displayed when the antenna is at the CW limit. In a similar
manner, the CCW Range should be set to the azimuth position which corresponds to the controller's
azimuth counter-clockwise limit.
SF:
POT SCALE FACTOR <1.00–180.00 DEG/VOLT>
This value specifies the azimuth scale factor applicable to the potentiometer-based azimuth feedback.
NOTE: The default value for this item will typically be correct.
PSF:
PULSE SCALE FACTOR <1-32767 PULSES/RAD>
This item specifies the approximate number of pulses measured per radian of azimuth travel. See
installation
section 4.1.12
is used by inclined orbit tracking and autopeak algorithms for determining amount of movement (in
pulses.)
ROFF:
RESOLVER OFFSET <+/-300.0 DEGREES>
The azim_resolver_offset_item defines the offset to be applied to the angle read directly from the azimuth
resolver for the purpose of displaying azimuth angle. Example: If when at the azimuth stow position the
raw azimuth resolver angle reads 181.3, a azim_resolver_offset_item of -181.3 will result in a resolver
based azimuth angle of 0.0.
DIR:
COUNT DIRECTION <0-NORMAL 1-REVERSED>
The azim_pulse_count_reversed_item defines whether the polarity of the Azimuth resolver matches that
of the RC4000 resolver circuitry. If the raw Azimuth resolver angle decreases as the mount moves CW,
the DIR item must be described as reversed.
OFF:
0.0
CW: 200.0
ROFF:
4.1.3.
4.1.10).
for calculation of the azimuth pulse scale factor. The azimuth pulse scale factor
101
Chapter 3
CONFIG-AZIM
SF: 86.93
0.00
DIR:1
Software
Azimuth
The CW Range
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