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ROTPAT causes SCHED to expand pointing patterns to include a raster in focus and rotation. The position offsets in this raster are specified by FOCOFF and ROTOFF. ROTPAT is only expected to be used by VLBA testers.

ROTPAT have a value which is the number of positions in focus/rotation in the pattern. It can only be used for 13cm, 6cm, 4cm, 2cm, 1cm, 7mm, and 3mm. Note that the overall scan must be ptslew plus rotpat times ( 2 times ptdur plus N times 10 times ptdur ) long to fit a full pattern with N pointing loops at each focus/rotation position.

A typical set of offsets would be ROTOFF=-1.5, 0, 0, 0, 1.5 and FOCOFF=0, -1, 0, 1, 0 with FOCPAT=5.

Craig Walker 2014-04-14