2017 January: Difference between revisions
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'''02:14 UT''' Delays look good! Now going to 3C84--first scan starts 02:11 UT, on source at 02:15 UT. 3 bands | '''02:14 UT''' Delays look good! Now going to 3C84--first scan starts 02:11 UT, on source at 02:15 UT. 3 bands | ||
'''23:59 UT''' Start of a really useful scan (filename IDB20170104235937), which is on a satellite (AMC-11) that broadcasts linear polarization at C band. The observation used a special band6 science channel definition, so that science channels are 5 MHz apart, and during the observation the Ant14 feed rotator was swept from -80 to 80 degrees. The data show very nice nulls at the lowest few frequencies that should indicate when the relevant polarization product has perpendicular feeds. | |||
Revision as of 13:01, 5 January 2017
Jan 03
15:00 UT Rebooted ROACHes due to bad communication with Roach 1.
21:00 UT New delay center corrections derived from the 2016 Dec 22 calibrator survey observation (using 2136+006) were sent to acc. The values for Ant 1-14 are: [0., 0., 0., -1.27, 0., 1.48, 4.26, 0., 1.5, 0., -10.24, 0., 0.] in nanoseconds
Jan 04
01:16 UT We were not getting good phases on calibrators, and discovered that my reboot of the ROACHes this morning left them with incorrect equalizer coefficients. This has been corrected as of 0100 UT.
01:50 UT Updated delay centers again, based on data taken today (01:01 UT).
02:14 UT Delays look good! Now going to 3C84--first scan starts 02:11 UT, on source at 02:15 UT. 3 bands
23:59 UT Start of a really useful scan (filename IDB20170104235937), which is on a satellite (AMC-11) that broadcasts linear polarization at C band. The observation used a special band6 science channel definition, so that science channels are 5 MHz apart, and during the observation the Ant14 feed rotator was swept from -80 to 80 degrees. The data show very nice nulls at the lowest few frequencies that should indicate when the relevant polarization product has perpendicular feeds.