October 2, 2015 For the last two weeks the Kokee Park Geophysical Observatory (KPGO) has been a two-shift operation where the ISI 12m antenna installation team has been working with the Harris operations team to shoot distributed reflectors from various angles in the near field of the main reflector. The reflector surface accuracy error RMS was .005" after the ninth iteration of photogrammetry shots. On October 1st, the 12 meter reflector was lifted by crane to its position on the antenna pedestal and retained the RMS surface accuracy achieved in the tests taken and adjustments made on the ground. Photogrammetry continues and the surface accuracy will be measured from various elevation angles. At Haystack Observatory, final plans are being practiced for the installation as well as maintenance procedures of the front end positioner inside the feed cone of the antenna. The analysis of quad ridge flared horn (QRFH) feedhorn antenna patterns taken at MIT - Lincoln Laboratory are also nearly ready for release. First Photogrammetry session on the assembled reflector (9/18/2015) Installing the crane rigging for the reflector (10/1/2015) Controlled lift of the reflector begins Reflector placed on the turning head and elevation arms The feed cone is lifted into place with the crane and attached with the manlift providing access The subreflector is attached to the hexapod interface across from the feed cone Photogrammetry resumes with antenna in the zenith position. The reflector surface accuracy error RMS was verified still to be .005 inches (10/1/2015).
