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The Pivot Minimum Radius setting defines a circular area at center of the field. Circular
swaths are assigned outside of this area. As the radius of circular swaths become smaller
and smaller, the inside spray nozzle moves slower than the outside spray nozzle. The PMR
setting determines the smallest circle to be sprayed. The PMR setting may also be used to
define an unplanted area at the center of the field that is used for installed equipment or
storage.
Use a known circular path to setup the Pivot Reference Circle. An example is the tire tracks
previously made by one of the pivot irrigation towers. After three points are marked, the
operator is shown guidance to the best circle, which is calculated from points marked on the
Pivot Reference Circle. The operator continues marking points while comparing this circular
guidance to the reference path being followed. When guidance indications match the refer-
ence path, the operator pushes the DOWN button to accept the current Pivot Reference
Circle. At this time, the resultant circular swath number is displayed along with circular
guidance. The operator finishes the initial swath and then traverses the field in any order
similar to the Snap-To-Swath procedure in parallel swathing. Care should be taken not to
re-spray the swath number that is the Pivot Reference Circle. Note the swath coverage
sequence shown on the diagram on the previous page.
Pivot Pattern Configuration
To use the Pivot Pattern, enter the Configuration Mode and navigate to the Swath
(SWA) menu. Set the Swath Type (SWT) to PVT. Set the Pivot Minimum Radius
(PMR) to the length from the center of the field to a point on a circle where circular
swathing may begin. Set the Swath Width (SWW) to the dimension across each
swath. The Swath Direction Control (DIR) is not used for the Pivot Pattern. Set the
Offset Guidance Scale (SCL) and Angle display (ANG) as for parallel swathing to
control guidance indication displays. The Headlands Type (HDL) is not used for the
Pivot Pattern swathing. Set Along Track antenna Offset (ATO) and Across Track
Antenna Offset (XTO) as for parallel swathing.
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