RC3000 Antenna Controller Appendix B-Mount Specific Data B-8
When outside of the auxiliary region, the down limit is defined by the hardware elevation down limit
switch. The auxiliary down region allows the hardware limit switch to be set lower than normal.
To define the auxiliary down region, move the antenna clockwise and counterclockwise to azimuth
positions where the boom can safely move below obstructions on the top of the vehicle. Note the
azimuth resolver count at these positions. These counts will define the aux_down_ccw and
aux_down_cw values.
Also note the elevation resolver count that the boom needs to stay above to ensure that the top of the
vehicle will not be contacted. This count will define the aux_down value.
Having recorded the aux_down_ccw, aux_down_cw and aux_down resolver counts, go to the
AUX_DOWN configuration screen (3.3.1.3.14) and enter the values.
When elevation movement is restricted by the auxiliary down software values, the elevation limit field in
the MANUAL mode will display “down” vs. “DOWN” which is displayed when the hardware limit is
encountered.
NOTE: If one does not care to implement an auxiliary down region, set the aux_down value to a count
that is below the hardware down limit position. This will effectively keep the “down” limit indication from
happening.
2.3.4 Polarization Calibration.
Separate reference voltages are maintained for the three linear feed types. At power up the linear feed
type is sensed and the reference voltage stored for that feed type is used. Therefore the reference
voltage for each linear feed type used should be separately set.
VF: The POL CW limit is mechanized via the mount’s limit switch vs. the ACU POL CW pot.
3.2.1 Manual Mode.
If the feed type input has sensed that a circular polarized feed is installed, no POL field will be displayed
since the RC3000 assumes that there is no need for polarization feedback from a circular polarized
system.
The azimuth angle is generated as a function of the azimuth resolver feedback. Elevation angle
represents true mount elevation based on feedback from the inclinometer. The scroll up key will switch
the display between azimuth and elevation angles to resolver “counts”.
When elevation is below the DOWN limit, the displayed elevation angle will be derived from the elevation
resolver.
When the auxiliary down region is active the limit display will indicate “down” vs. “DOWN”.
VF: the VF version allows for a fourth signal channel to be monitored. The Scroll/Dn key will allow the
user to scroll through RF/SS1/SS2/CH4. CH4 is the channel that will be used to monitor elevation drive
current. NOTE: below the DOWN limit, the display will be forced to CH4 to ensure that the appropriate
signal is being monitored at the STOW limit.
VF: When the elevation stow switch is first encountered, the limit display will indicate “stow” vs. “STOW”.
The display will change to “STOW” when either the stow current limit has been reached or the stow
timeout value (15 seconds) has expired. NOTE: after reaching STOW, elevation must be driven above
the stow limit switch to reinitialize the stow timeout.
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