BUS tubes for Reflector 4 were cleaned up in preparation for assembly. Antenna 2 will begin to look a little different this week as the aluminum panel covers for the BUS are installed. These will keep ice and sunlight off the BUS tubes. The origin of the mysterious 1 percent correlation seen when the receivers are pointed at absorbers has not been pinned down completely. IF downconverter the correlation is drastically reduced, suggesting that the problem is upstream of the 5 GHz IF in the control room.
More tests are underway.
More 230 GHz beacon tests were made last week with the MIT correlator. The phase drifts about 10-20 degrees per hour. There is a noticeable sunrise signature. An optical pointing run on Antenna 3 on OCT 30 for 80 stars gave rms residuals of 2.7 and 2.1 arcseconds in azimuth and elevation respectively. Work continued on Mount 4.