2017 February

Feb 01

11:27 UT Started another interferometric pointing run (CALPNT), which has been running since 08:16 UT without error. The wind is low, and Ant 14 is working well.

17:35 UT Ant 14 was found to have a Dec PERMIT error on the current scan started 17:27 UT. All scans prior to this are okay. I will stop this run at 19:19 UT, in order to do a SOLPNT calibration and update the 2-m pointing, then test the result with another SOLPNT observation.

19:23 UT The pointing calibration is complete on schedule. Only one scan was messed up by the Ant14 PERMIT error. A SOLPNT measurement will start at 19:30 UT.

Feb 05

18:52 UT I found several problems today. Ant 9 crio is not working--not sure why. Ants 10, 11 and 13 were not correctly pointed (found this based on SOLPNTCAL), probably because they had an incorrect STOW at some point. I stowed them and sent them back to the Sun just now. Will redo the SOLPNTCAL. Ant 14 control system was off, and when restored I had to restart the Beaglebone computer, reset the FRM, and I also found that Ant 14 HPol is low, with no LNA Drain current. This could not be corrected--may be a hardware failure.

19:08 UT Hmm. After restowing ants 10, 11 and 13, and redoing the SOLPNTCAL, they still show very bad pointing. I am not sure what the problem is.