GTAC Observation Log

1. Date : 26/08/2016
2. Observation Sr. No. : 8849
3. Observer : Nissim Kanekar, Jayaram Narayanan Chengalur, Jason X. Prochaska
4. Observer's Email : nkanekar@ncra.tifr.res.in, chengalur@ncra.tifr.res.in, xavier@ucolick.org
5. Project Name : %latex% The Spin Temperature of High-Redshift Damped Lyman-$\\\\\\\\alpha$ systems
6. Project Code : 30_068
7. Operator(s) : Deepak, Nilesh, Sachin, Shilpa
8. Command File : /odisk/gtac/cmd/nissim/1645\+635.cmd, /odisk/gtac/cmd/nissim/j0214\+0632.cmd, /odisk/gtac/cmd/nissim/0407-4409.cmd
9. LTA File : /gsbifrdata/25aug/30_068_25aug2016.lta.1, /gsbifrdata/25aug/30_068_25aug2016.lta, /gsbifrdata/26aug/30_068_26aug2016_gsb.lta.1, /gsbifrdata/26aug/30_068_26aug2016_gsb.lta, /gwbifrdata1/26aug/30_068_26aug2016_gwb.lta.1, /gwbifrdata1/26aug/30_068_26aug2016_gwb.lta
10. LogFlag File : /odisk/online1/logflags/30_068.FLAGS.21, /odisk/online1/logflags/30_068.FLAGS.20, /odisk/online1/logflags/30_068.FLAGS.19, /odisk/online1/logflags/30_068.FLAGS.18

ANTENNA SETTINGS :

11. RF Band(MHz) & Solar Attn(dB)- RF1 : 461.8 MHz ,RF2 : 461.8 MHz, SA1 : 0 dB, SA2 : 0 dB
12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 525 MHz, ILO2 : 525MHz , IVLO1 : 63.2 MHz, IVLO2 : 63.2 MHz 
13. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 4+14 dB, 6 MHz,ON, IF-CH2 : 4+14 dB, 6 MHz,ON

GSB SETTINGS :

14. GSB Host : gsbm1_shivneri
15. GSB Mode : Realtime
16. GSB LTA : 8
17. GSB CTRL : ONLINE
18. GSB Fstop : ON
19. GAIN EQ : ON
20. Stokes : Total_Intensity
21. Beam - 1 : OFF
22. Beam - 2 : OFF
23. ACQ BW : 16.666666 MHz
24. Final BW : 2 MHz; Step # 3
25. Maximum Channels : 512
26. Channel Numbers : 0:511:1
27. LO5 -1  : 136.8
28. LO5 -2  : 168.2

29. Frequency Parameters (TPA) : 461.8 461.8 525 525 63.2 63.2
30. Integration Time : 16.1061 Sec
31. No of Antennas Working(Fringing) at the beginning :25

32. Name of Non-Working Antennas (with reason for each) :
E06 : Mechanical work.
C14,S03,W03,E04 : No cone-dipole (up-graded) feed at 325MHz.
33. Note for Backup :

34. Start and End Time of Obs.(IST): 25 Aug 2016 21:45:00 - 26 Aug 2016 10:00:00

35. ONLINE Machine : Shivneri

36. No of Antennas Working(Fringing) at the end :25

37. Comments (During Observations) :
Settings for observation-1:
Line frequency : 454.5 MHz
   RF Band     : 327 MHz
   LO(1)       : 525 MHz
   IF BW       : 6 MHz
   LO(5)       : 136.8 168.2 MHz
   LO(4)       : 63.2 63.2 MHz
   Baseband BW : 2.08 MHz
   Step        : 3
   Channels    : 512
   TPA 461.8 461.8 525 525 63.2 63.2
---------------------------------------------------------------------------
21:30 : Started settings.
21:58 : Started scan on 3C468.1 for 7min.
22:08 : '/odisk/gtac/cmd/nissim/1645+635.cmd' command file started.

23:38 : phase cal set below horizon, stopped command file.
23:43 : Started scan on 3c48 for ~ 7 min.

23:50 : Started settings.
Settings for Observation-1:

Source list     : /odisk/gtac/source/nk.list
Command file    : /odisk/gtac/cmd/nissim/j0214+0632.cmd


Target source   : J0214+0632
Flux calibrator : 3C48
Phase calibrator: 3C46

Line frequency : 457.1 MHz

   RF Band     : 327 MHz
   LO(1)       : 525 MHz
   IF BW       : 18 MHz
   LO(5)       : 139.4 165.6 MHz
   LO(4)       : 60.6 60.6 MHz
   Baseband BW : 2.08 MHz
   Step        : 3

   Channels    : 512

   lta         : 8m

TPA 464.4 464.4 525 525 60.6 60.6

The band covers 456.07 - 458.15 MHz.

23:55 : Started scan on 3C48 for ~ 7 min.
00:15 : Started '/odisk/gtac/cmd/nissim/j0214+0632.cmd' command file.

05:35 : Stopped command file.
05:38 : Started scan on 3C48 for ~ 10 min.

05:48 : Started settings.
Settings for Observation-2:

Source list     : /odisk/gtac/source/nk.list
Command file    : /odisk/gtac/cmd/nissim/0407-4409.cmd


Target source   : J0407-4409
Flux calibrator : 3C48
Phase calibrator: 0438-436

Line frequency : 487.61 MHz

All ALCs ON

   RF Band     : 327 MHz
   LO(1)       : 560 MHz
   IF BW       : 18 MHz
   LO(5)       : 135 170 MHz
   LO(4)       : 65 65 MHz
   Baseband BW : 2.08 MHz
   Step        : 3

   Channels    : 512
   lta         : 4

TPA 495 495 560 560 65 65

The band covers 486.67 - 488.75 MHz

GWB settings: NARROW-BAND MODE

I would also like to record GWB data covering the frequency range
385-410 MHz, using the narrow-band mode. 

   ACQ BW       : 100 MHz
   GAB LO	: 480 MHz
   Channels     : 16384
   LTA          : 8
   Stokes       : 2
   TPA frequency: Manual (LOCAL)
   Sideband FLAG: Flipped (LSB)

   Decimation factor: 4
   Final BW	: 25 MHz
   DDC LO	: 70 MHz
   Channel 1	: 410 MHz
   Channel 16384: 385 MHz

05:59 : Started scan on 3C48 for ~ 6 min.
        Noticed that LO may not be set correctly. as phases for GSB are varying very fast. tried resetting LO parameters.
06:05 : Started scan on 3C48 for ~ 2 min.
        Noticed that LO may not be set correctly. as phases for GSB are varying very fast. tried resetting LO parameters. Also restarted GSB.

06:11 : Started scan on 3C48 for ~ 10 min.
        Still problem in GSB exists, phases varying very fast.
06:24 : Started '/odisk/gtac/cmd/nissim/0407-4409.cmd' command file.

06:46 : Forgot to put  GWB in AUTO-SYNC mode, apologies.
06:47 : re-started command file.
07:26 : E-arm power failed.
07:38 : E-arm restored.
09:03 : Stopped command file and started recording phase cal.
00:09 : Stopped scan on phase cal.
09:14 : Started recording on 3C147.
09:34 : Stopped scan on 3C147 and closed observation session.