September 8, 2007 PTCS observing
project code: TPTCSPNT_070908
script: NewHalfPower?
Note: Data taken from Sep 3, 2007 through noon Sep 20, 2007 have the Antenna manager bug which causes the OBSC_EL column in the Antenna FITS file to be uncorrected for refraction.
8:10 PM (local) start half-power track : starting scan 3607
Sky mostly clear, winds have died down (< 2 m/s)
half power tracks on the same source as last night (2038+5119) but with offset in azimuth this time.
power levels pretty stable.
Procedure: peak/focus, calibrate, 25 min track, peak/focus, 2nd 25 minute track.
Scans 3607 thru 3691 are the data on 2038+5119. X-band.
3607-3611 Peak/focus
3612-3616 calibration,
Pol 1 Pol 2
3612=on source 34.6164 34.1076
3613=at 0.4 beam 32.3589 31.7688
3614=at 0.5 beam 31.0390 30.4500
3615=at 0.6 beam 30.2561 29.6419
3616=at 10 beams 27.8385 27.2226
derive (32.3589-30.2561) / (0.2*82") = 0.128 K/arcsec and 0.130
3616 way off rx_rms = 0.19" / 0.21"
Azim Elev Wind avg (rms) m/s
(at midpoint) Wind 1 Wind 2 Wind 3 WindDir1 azim-wdir
3617 half-power-azim 2007_09_08_00:18:15.fits 51 62 1.2(0.9) 0.6(0.3) 1.9(0.3) 37(14) 14
rms ~ 1.55" / 1.57" - rx = 1.53" / 1.55", avg = 1.54"
plot of scan 3617
3618-3622 peak/focus
3623 half-power-azim 2007_09_08_00:48:28.fits 47 67 0.3(0.2) 0.6(0.3) 1.2(0.2) 110(33) -63
rms = 1.04" / 1.16" - rx = 1.03"/1.14", avg = 1.09"
3624-3628 peak/focus
3629-3633 calibration
3629 34.5356 33.9347
3630 31.9925 31.4293
3631 31.0664 30.5084
3632 30.1855 29.5476
3633 27.7893 27.1214 rx_rms = 0.20" / 0.23"
derive 0.1102 and 0.1147 K/arcsec
3634 half-power-azim 2007_09_08_01:22:38.fits 40 71 0.5(0.2) 0.2(0.2) 1.4(0.2) 75(41) -35
rms = 1.26"/1.37" - rx = 1.24"/1.35", avg = 1.30"
3635-3639 peak/focus
3640 half-power-azim 2007_09_08_01:52:58.fits 28 75 0.4(0.3) 0.2(0.2) 1.1(0.2) -5(80) 23
rms = 0.95"/1.12" - rx = 0.93"/1.10", avg = 1.01"
3641-3645 peak/focus
3646-3650 calibration
3651 half-power-azim 2007_09_08_02:27:19.fits 8 77 0.3(0.2) 0.6(0.4) 0.8(0.5) 193(26) -185 = +175
3652-3656 peak/focus
3657 half-power-azim 2007_09_08_02:57:45.fits -13 77 0.3(0.2) 0.3(0.2) 0.7(0.2) 219(0) -206 = +154
3658-3662 peak/focus
3663-3667 calibration
3668 half-power-azim 2007_09_08_03:32:05.fits -32 74 0.9(0.4) 1.0(0.3) 0.7(0.1) 218(14) -250 = +110
3669-3673 peak/focus
3674 half-power-azim 2007_09_08_04:02:27.fits -42 70 0.2(0.1) 0.4(0.2) 0.6(0.1) 248(0) -206 = +154
3675-3679 peak/focus
3680-3684 calibration
3685 half-power-azim 2007_09_08_04:37:30.fits -48 65 0.7(0.3) 0.6(0.3) 0.7(0.1) 224(17) -176
3686-3690 peak/focus
3691 half-power-azim 2007_09_08_05:07:41.fits -51 61 0.3(0.2) 0.2(0.1) 0.9(0.1) 248(8) -197 = +163
---------------------------------------
Half-power tracks on 2038+5119 until 1:30 AM, then change to 0237+2848
and run until ...
3692-3696 peak/focus
3697-3701 calibration
3702 half-power-azim 2007_09_08_05:46:29.fits 92 53 0.2(0.0) 0.1(0.1) 1.3(0.2) 249(0) -157
3703-3707 peak/focus
3708 half-power-azim 2007_09_08_06:16:38.fits 98 59 0.5(0.3) 0.3(0.3) 1.0(0.1) 247(9) -149
3709-3713 peak/focus
3714-3718 calibration
3719 half-power-azim 2007_09_08_06:51:23.fits 106 66 0.6(0.3) 0.4(0.2) 0.9(0.1) 252(15) -146
3720-3724 peak/focus
3725 half-power-azim 2007_09_08_07:21:42.fits 116 72 0.8(0.3) 0.9(0.4) 0.8(0.7) 262(33) -146
3726-3730 peak/focus
3731-3735 calibration
3736 half-power-azim 2007_09_08_07:55:56.fits 135 77 0.7(0.4) 0.3(0.3) 0.8(0.3) 271(40) -136
3737-3741 peak/focus
3742 half-power-azim 2007_09_08_08:26:26.fits 166 80 0.2(0.1) 0.2(0.2) 0.2(0.2) 289(1) -123
3743-3747 peak/focus
3748-3752 calibration
3753 half-power-azim 2007_09_08_09:01:43.fits 210 79 0.2(0.1) 0.0(0.0) 0.0(0.0) 283(0) -73
3754-3758 peak/focus
3759 half-power-azim 2007_09_08_09:32:11.fits 234 75 0.3(0.2) 0.3(0.4) 0.0(0.0) 277(13) -43
3760-3764 peak/focus
3765-3769 calibration
3770 half-power-azim 2007_09_08_10:06:22.fits 249 69 0.3(0.2) 0.3(0.2) 0.2(0.1) 247(12) +2
3771-3775 peak/focus
3776 half-power-azim 2007_09_08_10:36:37.fits 258 63 0.3(0.1) 0.1(0.1) 0.2(0.2) 244(3) +14
3777-3781 peak/focus
3782-3786 calibration
3787 half-power-azim 2007_09_08_11:12:35.fits 265 56 0.4(0.3) 0.3(0.3) 0.2(0.1) 272(4) -7
3788-3792 peak/focus
3793 half-power-azim 2007_09_08_11:42:44.fits 270 51 0.6(0.3) 0.3(0.2) 0.6(0.3) 243(20) +27
3794-3798 peak/focus
3799-3803 calibration
3804 half-power-azim 2007_09_08_12:17:33.fits 275 44 0.7(0.3) 0.4(0.3) 1.1(0.1) 237(27) +38
3805-3809 peak/focus
3810 half-power-azim 2007_09_08_12:47:44.fits 279 38 0.8(0.3) 0.4(0.2) 0.8(0.1) 219(66) +60
3811-3815 peak/focus
3816-3820 calibration
3821 half-power-azim 2007_09_08_13:22:02.fits 284 31 0.8(0.3) 0.6(0.3) 0.5(0.1) 27(42) -103
3822-3826 peak/focus
3827 half-power-azim 2007_09_08_13:52:08.fits 288 26 0.7(0.3) 0.6(0.2) 0.6(0.2) 8(37) -80
3828-3832 peak/focus
3833-3837 calibration
3838 short? 2007_09_08_14:26:10.fits 290 21 -- -- --
3839-3845 peak/focus (2 aborted scans)
3846-3850 calibration
3851 half-power-azim 2007_09_08_14:37:09.fits 293 18 1.1(0.4) 1.0(0.4) 0.1(0.1) 21(43) -88
3852-3856 peak/focus
3857-3861 calibration
3862 half-power-azim 2007_09_08_15:06:16.fits 297 13 1.6(0.6) 1.4(0.7) 0.2(0.3) 337(48) -40
3863-3867 peak/focus
-------change to 1331+3030 and K-band receiver --------------------------------------
3868-3881 peak/focus
3882-3886 calibration
3887 half-power-elev 2007_09_08_16:01:33.fits 84 47 2.0(0.6) 1.8(0.8) 0.6(0.3) 7(46) 77
3888-3897 peak/focus
About 10 AM -- change NewHalfPower2? to do only one 20 minute track per script
-- this may help as we get to lower elevations.
Elevation is now 26 deg.
End at about 11:40 AM (16:40 UT)
Change to K-band receiver 18.3GHz - peak up on 3C286 (!331+305) -- looks good;
Run "NewHalfPowerK" to run halfpower tracks on 3C286.
This will do 3 25-minute tracks per script, so about 1 hour.
Using beam 2 as a reference will let us correct for Tsys variations.
Half-power offset is in elevation.
Will run this until 6 PM (22:00 UT), then its on to the backup projects.
Following Data are in TPTCSPNT_70908
midpoint avg (rms) wind Direction(rms)
Scan Half-power-elev Azim Elev Wind 1 Wind 2 Wind 3 WindDir1 Azim-WindDir1
3908 1331+3030 2007_09_08_17:08:09.fits 95 60 2.0(1.1) 1.8(0.8) 0.8(0.4) 283(48) -188 = +172
3914 " 2007_09_08_17:37:53.fits 101 66 1.9(0.7) 1.6(0.8) 1.3(0.5) 269(84) -168
3920 " 2007_09_08_18:07:39.fits 109 72 2.8(1.1) 2.4(1.0) 1.2(0.5) -5(74) +114
3931 " 2007_09_08_18:41:27.fits 126 77 3.2(1.3) 2.6(1.3) 2.1(0.9) 326(33) -200 = +160
3937 " 2007_09_08_19:11:41.fits 155 81 4.5(1.2) 4.1(1.9) 2.3(1.0) 26(35) +129
3943 " 2007_09_08_19:41:46.fits 200 82 3.4(1.2) 3.9(1.2) 1.4(0.7) 355(52) -155
3954 " 2007_09_08_20:15:38.fits 234 77 3.0(1.1) 2.5(1.0) 0.8(0.5) 11(45) +223 = -137
3960 " 2007_09_08_20:45:35.fits 249 72 4.1(0.7) 3.8(0.8) 1.3(0.6) 55(9) +194 = -166
3966 " 2007_09_08_21:15:24.fits 258 67 2.1(0.6) 2.5(0.8) 0.5(0.4) 32(42) +226 = -134
About 16:28 Astrid message re "no corrections applied"
No pop-up came up bur Astrid proceeded as if observer had answered "yes", then finally restarted on a new block.
This happened twice, then Astrid purported to hang while acquiring Sacen 1 of an azimuth pointing set.
System thought it was still acquiring data.
Mark Clark called, Astrid restarted and functioned normally.
17:17 Temp=29.0C, P=929.13mBar, DP=13.4C, Wind=2.0m/s
21:06 Cloud cover increasing, stifingly warm. T=28.1C, P=926.78mBar, DP=13.5C, Wind 2.5m/s
Obs. program appears to have been running continuously.
Data appear consistent, stable with very small fluctuations.
Scan 3961 Az tracking error max 4.10 -> min 3.95
Scans 3961/2 Ht=4.49 -> 4.09 (az)
Scans 3963/4 Ht 4.81 -> 4.92 (el)
Scan 3965 W=61.031, Centr=6.596, Ht=4.728, Tsys=49.49K
21:53 Scan 3977.
Closing observing program now
-- FrankGhigo - 08 Sep 2007
scan3617scatter.pdf