Research Concepts RC4000 - Manual (Page 88)

RC4000 Antenna Controller Chapter 3 Software
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3.3.1.2.4 Polarization Calibration
REF_V:2.50 OFF: 0.0 CONFIG-POL
CCW:-90.0 CW: 90.0 SF: 41.67
TYPE:2 REF:1 B:1 LO: 10750 AUTO: 1
SET REFERENCE VOLTAGE <2.00 – 3.00>
REF_V: SET REFERENCE VOLTAGE <2.00 - 3.00>
The pol_zero_voltage defines the voltage present when the polarization axis is in its center of motion.
See the zero voltage installation section 2.3.4.
OFF: POL OFFSET <-90.0/+90.0 DEGREES>
The pol_offset item corrects for discrepancies between the polarization axis’ electrical and mechanical
alignment.
CW: POL CW LIMIT<0.0 - 179.9 DEGREES>
CCW: POL CCW LIMIT<0.0 - 179.9 DEGREES>
The cw_pol_limit and ccw_pol_limit configuration items specify the range of polarization axis movement.
Both values are entered as positive values but the controller assigns the correct sign internally.
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 potentiometers as described in the installation
section.
SF: SCALE FACTOR <1.00 –180.00 deg/volt>
This value specifies the scale factor applicable to the potentiometer-based polarization feedback. NOTE:
The default value for this item will typically be correct.
TYPE: <0>CIRCULAR <1>SINGLE <2>DUAL
The polarization_type configuration item specifies the configuration of the feed drive. This item will be
used by the controller to determine the appropriate automatic movement of the polarization axis.
Circular type specifies that no movement will be needed to align the polarization axis.
Single type specifies that the installation has a feed in just one orientation and therefore separate
movements must be made to achieve horizontal and vertical polarization positions.
Dual type specifies that separate feeds exist 90 degrees apart. For this configuration just one movement
to achieve both horizontal and vertical positions is required. If this is not the case the system should be
described as a single feed type so that separate movements will be made.
REF: <0>HORIZONTAL <1>VERTICAL
The orientation achieved by placing the polarization axis in the reference position.
BAND: <0-C 1-Ku 2-CK 3-L 4-X 5-Ka 6-S>
Defines the frequency band of the associated feed. This information may be used to determine the
apparent beamwidth of the system.