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RC4000 ACU Boardset
3.3.1.2.2 Elevation Calibration
VREF:1.30
DOWN:
PSF:10431
ZERO DEG VOLTAGE <1.00–4.00 VOLTS>
VREF:
ZERO DEG VOLTAGE <1.00-4.00 VOLTS>
The elev_zero_voltage defines the voltage present when the elevation axis is at its reference position.
See Elevation Calibration in
OFF:
ANGLE OFFSET <+/-90.0 DEGREES>
The elev_squint_factor configuration item corrects for discrepancies between the antenna's electrical and
mechanical bore sight alignment. The squint factor also compensates for errors in the attachment of the
elevation position sensor. The elevation squint factor is the difference between the antenna's theoretical
and actual elevation pointing angle. The value for this constant is determined during the elevation
alignment calibration procedure (4.1.10). The VALUE OF THIS CONSTANT MUST BE SET TO 0.0
BEFORE THE ELEVATION CALIBRATION OCCURS. The nominal value of this constant is 0.0.
DOWN:
DOWN LIMIT <-20.0-120.0 DEGREES>
UP:
UP LIMIT <-20.0-120.0 DEGREES>
The down_elev_limit and up_elev_limit configuration items specify the valid elevation operating range in
degrees. If the LOCATE mode calculates a target elevation outside of this range, an elevation range
error will be triggered.
The spiral search algorithm (when based on pot-based movements) also uses these values to limit the
area that may be searched.
SF:
SCALE FACTOR <10.00 – 90.00 mV/DEG>
The elev_scale_factor_mv_deg configuration item specifies the observed output of the elevation
inclinometer.
PSF:
PULSE SCALE FACTOR <1-32767 PULSES/RAD>
This item specifies the approximate number of pulses measured per radian of elevation travel. See
installation
section 4.1.12
used by inclined orbit tracking and autopeak algorithms for determining amount of movement (in pulses.)
ROFF:
RESOLVER OFFSET <+/-300.0 DEGREES>
The elev_resolver_offset_item defines the offset to be applied to the angle read directly from the elevation
resolver for the purpose of displaying elevation angle. Example: If when at the elevation reference
(deploy) position the raw elevation resolver angle reads 180.0, a elev_resolver_offset_item of -157.7 will
result in a resolver based elevation angle of 22.3.
NOTE: the resolver-based angle is displayed in MANUAL mode when the elevation DOWN limit is active.
DIR:
COUNT DIRECTION <0-NORMAL 1-REVERSED>
The elev_pulse_count_reversed_item defines whether the polarity of the Elevation resolver matches that
of the RC4000 resolver circuitry. If the raw Elevation resolver angle decreases as the mount moves UP,
the DIR item must be described as reversed.
Chapter 3
OFF:
0.0
5.0
UP:
90.0
ROFF:
section
4.1.2.
for calculation of the elevation pulse scale factor. The pulse scale factor is
100
CONFIG-ELEV
SF:50.00
0.00
DIR:0
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