2017 April - Revision history

Nkuroda: /* Apr 05 */

2017-05-17T18:56:49Z

Apr 05

← Older revision		Revision as of 18:56, 17 May 2017
Line 31:		Line 31:
	= Apr 05 =		= Apr 05 =
	'''21:56 UT''' Just a note to say that I found the tunable LO not switching (must have missed the FSEQ-ON command somehow), and it was that way for about 20 minutes (since 21:35 UT). I issued FSEQ-ON, and it seems to be running now.		'''21:56 UT''' Just a note to say that I found the tunable LO not switching (must have missed the FSEQ-ON command somehow), and it was that way for about 20 minutes (since 21:35 UT). I issued FSEQ-ON, and it seems to be running now.

			[[File:2017-04-05 1430-1900 selfcal White AIA171.png\|thumb\|800px\| '''Image 1:''' Left: AIA 171 image at 2017-04-05 17:00UT. Right: EOVSA Self-cal image on 2017, Apr. 5. (Credit: Stephen White)]]

	= Apr 07 =		= Apr 07 =

Nkuroda: /* Apr 07 */

2017-05-17T18:55:34Z

Apr 07

← Older revision		Revision as of 18:55, 17 May 2017
Line 37:		Line 37:
	'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.		'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.

	[[File:2017-04-07 1505-1850 selfcal White.png\|thumb\|800px\| '''Image 1:''' Left: AIA 171 image at 2017-04-07 17:00UT. Right: EOVSA Quiet Sun Self-cal image on 2017, Apr. 7. (Credit: Stephen White)]]		[[File:2017-04-07 1505-1850 selfcal White.png\|thumb\|800px\| '''Image 2:''' Left: AIA 171 image at 2017-04-07 17:00UT. Right: EOVSA Quiet Sun Self-cal image on 2017, Apr. 7. (Credit: Stephen White)]]

	= Apr 08 =		= Apr 08 =

Nkuroda: /* Apr 07 */

2017-05-16T23:17:51Z

Apr 07

← Older revision		Revision as of 23:17, 16 May 2017
Line 37:		Line 37:
	'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.		'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.

	[[File:2017-04-07 1505-1850 selfcal White.png\|thumb\|~~300px~~\|'''Image~~. 2~~:''' Quiet Sun Self-cal image on 2017, Apr. 7. (Credit: Stephen White)]]		[[File:2017-04-07 1505-1850 selfcal White.png\|thumb\|800px\| '''Image 1:''' Left: AIA 171 image at 2017-04-07 17:00UT. Right: EOVSA Quiet Sun Self-cal image on 2017, Apr. 7. (Credit: Stephen White)]]

	= Apr 08 =		= Apr 08 =

Nkuroda: /* Apr 07 */

2017-05-16T22:25:03Z

Apr 07

← Older revision		Revision as of 22:25, 16 May 2017
Line 36:		Line 36:

	'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.		'''20:00 UT''' We had a nice C-class solar flare at about 19:50 UT.

			[[File:2017-04-07 1505-1850 selfcal White.png\|thumb\|300px\|'''Image. 2:''' Quiet Sun Self-cal image on 2017, Apr. 7. (Credit: Stephen White)]]

	= Apr 08 =		= Apr 08 =

Dgary: /* Apr 28 */

2017-04-30T14:19:10Z

Apr 28

← Older revision		Revision as of 14:19, 30 April 2017
Line 154:		Line 154:
	= Apr 28 =		= Apr 28 =
	'''12:29 UT''' The wind was again high all night, and is supposed to remain high until later tonight. I did try more CALPNT2M measurements, and although none of the 25-min measurements completed, I did get at least one on the RA axis, so I can develop the software for reading it. Initial tests look promising. Today I hope that Kjell can work on getting the notch filters into one of the FEMs as a test.		'''12:29 UT''' The wind was again high all night, and is supposed to remain high until later tonight. I did try more CALPNT2M measurements, and although none of the 25-min measurements completed, I did get at least one on the RA axis, so I can develop the software for reading it. Initial tests look promising. Today I hope that Kjell can work on getting the notch filters into one of the FEMs as a test.

			'''22:00 UT''' We took Ant 5 out of the array, and Kjell installed one of the notch filters on the HPol side. I did a voltage-to-power calibration measurement before and after this installation, although it is not yet analyzed. Kjell tells me the filter is "jury-rigged" into the system right now, and would not allow the case to close, so the Ant 5 FEM will sit on the bench until Monday, at least, and possibly longer.

			= Apr 29 =
			'''20:00 UT''' I have been working on software to analyze the CALPNT2M measurements. Meanwhile, since the wind was high, we did normal solar observing (but without calibration!). The wind lessened, so I have started the CALPNT2M measurements around 19:30 UT.

			= Apr 30 =
			'''14:14 UT''' The CALPNT2M measurements went all night, so we have around 30 good measurements. I am now doing the start-of-the-day calibration, and solar observations will start right about now. I have completed my work on the analysis software, and the results may be okay, although there is a puzzling change of amplitude on ants > 4 on some sources, which I do not understand. It may signal a bug in the software. Once I have the measurements tabulated, I will have to adjust the mountcal routines to work with the new table format (with a lot more columns!).

Dgary: /* Apr 27 */

2017-04-28T13:32:26Z

Apr 27

← Older revision		Revision as of 13:32, 28 April 2017
Line 151:		Line 151:
	= Apr 27 =		= Apr 27 =
	'''12:48 UT''' The wind was high all night (and the last calibrator scan of yesterday did not succeed). I looked at some recent 2-m pointing (SOLPNT) results, and it is clear that there are systematic, time-dependent offsets that need to be improved. Apparently (not a surprise) my initial pointing calibrations using optical observations of stars is not permanent. However, now that Ant 14 is working, there is no reason we cannot do interferometric radio pointing on calibrators. To that end, this morning I created the necessary files and infrastructure for that (ProjectID CALPNT2M, and also .scd, .ctl, and .trj files with the same name). I tested it with testpntcal2m.scd, and it seems to work. I cannot analyze and test the actual data, however, since Ant 14 is not tracking due to WINDSCRAM. I will fully test it at the first opportunity.		'''12:48 UT''' The wind was high all night (and the last calibrator scan of yesterday did not succeed). I looked at some recent 2-m pointing (SOLPNT) results, and it is clear that there are systematic, time-dependent offsets that need to be improved. Apparently (not a surprise) my initial pointing calibrations using optical observations of stars is not permanent. However, now that Ant 14 is working, there is no reason we cannot do interferometric radio pointing on calibrators. To that end, this morning I created the necessary files and infrastructure for that (ProjectID CALPNT2M, and also .scd, .ctl, and .trj files with the same name). I tested it with testpntcal2m.scd, and it seems to work. I cannot analyze and test the actual data, however, since Ant 14 is not tracking due to WINDSCRAM. I will fully test it at the first opportunity.

			= Apr 28 =
			'''12:29 UT''' The wind was again high all night, and is supposed to remain high until later tonight. I did try more CALPNT2M measurements, and although none of the 25-min measurements completed, I did get at least one on the RA axis, so I can develop the software for reading it. Initial tests look promising. Today I hope that Kjell can work on getting the notch filters into one of the FEMs as a test.

Dgary: /* Apr 26 */

2017-04-27T12:53:52Z

Apr 26

← Older revision		Revision as of 12:53, 27 April 2017
Line 148:		Line 148:

	'''11:55 UT''' The observations went quite well last night. I tweaked the delays on a couple of antennas as a result. Wind is low so far today, so the observations should be relatively normal on calibrators and the Sun.		'''11:55 UT''' The observations went quite well last night. I tweaked the delays on a couple of antennas as a result. Wind is low so far today, so the observations should be relatively normal on calibrators and the Sun.

			= Apr 27 =
			'''12:48 UT''' The wind was high all night (and the last calibrator scan of yesterday did not succeed). I looked at some recent 2-m pointing (SOLPNT) results, and it is clear that there are systematic, time-dependent offsets that need to be improved. Apparently (not a surprise) my initial pointing calibrations using optical observations of stars is not permanent. However, now that Ant 14 is working, there is no reason we cannot do interferometric radio pointing on calibrators. To that end, this morning I created the necessary files and infrastructure for that (ProjectID CALPNT2M, and also .scd, .ctl, and .trj files with the same name). I tested it with testpntcal2m.scd, and it seems to work. I cannot analyze and test the actual data, however, since Ant 14 is not tracking due to WINDSCRAM. I will fully test it at the first opportunity.

Dgary: /* Apr 26 */

2017-04-26T11:56:45Z

Apr 26

← Older revision		Revision as of 11:56, 26 April 2017
Line 146:		Line 146:

	'''04:38 UT''' I updated the delays, and now will take more data with pcal.fsq, alternating between 3C273 and 3C286. Note that with my change of attenuation for Ant14 VPol, I do get reasonable phase coherence at lower frequencies, but it dies badly at higher frequencies. But at least I am not getting zeros.		'''04:38 UT''' I updated the delays, and now will take more data with pcal.fsq, alternating between 3C273 and 3C286. Note that with my change of attenuation for Ant14 VPol, I do get reasonable phase coherence at lower frequencies, but it dies badly at higher frequencies. But at least I am not getting zeros.

			'''11:55 UT''' The observations went quite well last night. I tweaked the delays on a couple of antennas as a result. Wind is low so far today, so the observations should be relatively normal on calibrators and the Sun.

Dgary: /* Apr 26 */

2017-04-26T04:40:04Z

Apr 26

← Older revision		Revision as of 04:40, 26 April 2017
Line 144:		Line 144:

	'''04:27 UT''' Well! The good data are back! I am not sure if it was rebooting the ROACHes, or what, but all looks okay even with pcal_all-hi.fsq.		'''04:27 UT''' Well! The good data are back! I am not sure if it was rebooting the ROACHes, or what, but all looks okay even with pcal_all-hi.fsq.

			'''04:38 UT''' I updated the delays, and now will take more data with pcal.fsq, alternating between 3C273 and 3C286. Note that with my change of attenuation for Ant14 VPol, I do get reasonable phase coherence at lower frequencies, but it dies badly at higher frequencies. But at least I am not getting zeros.

Dgary: /* Apr 26 */

2017-04-26T04:28:17Z

Apr 26

← Older revision		Revision as of 04:28, 26 April 2017
Line 142:		Line 142:
	= Apr 26 =		= Apr 26 =
	'''04:10 UT''' The wind was indeed high all day. This evening it has abated a bit, so I grabbed some calibration on 3C273, but the results are '''horrible'''. VPol is not only bad, but zero for many frequencies. I attempted to fix that by setting the ADC attenuation from the normal 15 to only 5, to somewhat compensate for the low RF power on Ant 14 VPol. However, all of the baselines except Ant 8 had really bad data, so I decided to up the EQ coefficients from 4 to 8, and reboot the ROACHes and LO1A. Any of those things could have been at fault, I suppose. I am now taking more data, to see what we have, but it will take awhile. I really should go to fewer bands.		'''04:10 UT''' The wind was indeed high all day. This evening it has abated a bit, so I grabbed some calibration on 3C273, but the results are '''horrible'''. VPol is not only bad, but zero for many frequencies. I attempted to fix that by setting the ADC attenuation from the normal 15 to only 5, to somewhat compensate for the low RF power on Ant 14 VPol. However, all of the baselines except Ant 8 had really bad data, so I decided to up the EQ coefficients from 4 to 8, and reboot the ROACHes and LO1A. Any of those things could have been at fault, I suppose. I am now taking more data, to see what we have, but it will take awhile. I really should go to fewer bands.

			'''04:27 UT''' Well! The good data are back! I am not sure if it was rebooting the ROACHes, or what, but all looks okay even with pcal_all-hi.fsq.