A interesting phase-coherent holography technique was developed as part of the holography campaign to study the Effelsberg 100m antenna. Two high quality images were obtained in May-June, 2001, one during daytime hours, the second at night.
The two images are in good agreement with the earlier Misell-algorithm study, and show the extensive progress made in remedying the outer three rings of panels. The images also show evidence for thermal deformations of the panels.
Section 2 describes the observations; we show that the two images are of excellent quality, with aperture plane resolution of about 1 m, and measurement accuracy better than 0.1mm.
Section 3 assesses the images in order to derive a table of panel setting adjustments.