RESEARCH CONCEPTS RC4500 - Polarization Calibration

RC4500 Antenna Controller Chapter 5 MODES – In Depth Descriptions
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5.2.1.2.3 Polarization Calibration
VREF:2.500 OFF: 0.000 CONFIG-POL
CCW:-100.000 CW: 100.000 SF: 40.000
ZERO DEG VOLTAGE <1.000–4.000 VOLTS>
VREF: ZERO DEG VOLTAGE <1.000 - 4.000 VOLTS>
The pol_reference_voltage defines the voltage present when the polarization axis is in its center of motion.
See Polarization Offset Angle in Section 4.2.3.3.
OFF: ANGLE OFFSET <+/-90.000 DEGREES>
The pol_offset item corrects for discrepancies between the polarization axis’ electrical and mechanical
alignment.
CW: CW LIMIT<+/-180.000 DEGREES>
CCW: CCW LIMIT<+/-180.000 DEGREES>
The cw_pol_limit and ccw_pol_limit configuration items specify the range of polarization axis movement.
The values are used to check validity of stored satellite data and for calculating horizontal and vertical
polarization positions. Actual polarization limits are set by: 1) discrete limit switches located on the feed,
or 2) software limits based on voltage feedback from the polarization position sense potentiometer.
SF: POT SCALE FACTOR <1.000 –180.000 DEG/V>
This value specifies the scale factor applicable to the potentiometer-based polarization feedback. NOTE:
The default value for this item will typically be correct.