July 26, 2006
ALMA Pointing
15
Tripod Print-Through on the VertexRSI Antenna
±VertexRSI antenna has three-point base
±Antenna nods in elevation as it rotates in azimuth
±Print-through of tripod support to azimuth bearing
±7 degree misalignment to tripod points
OPT Pointing Model Fit
Tiltmeter Measurement
VertexRSI antenna measurement of --180 to +180 deg AZ rotation. The left panel is the x--direction of the tiltmeter, the right panel is the y--direction. The red curves are the residuals of the best--fit a0 + a1 sin(A + b1), the blue curves are the residuals of the best--fit a0 + a1 sin(A + b1)
+ a3 sin(3A + b3). The gray lines show the location of the
pedestal corners (1,2,3).