[daip] Tsys table and antab file in experiments BE061
Amy Mioduszewski
amiodusz at nrao.edu
Thu Aug 16 15:17:35 EDT 2012
O.K., I finally downloaded your data and loaded it into aips. I have looked at
the TSYS in SNPLT and they all look great except for HN and OV/LCP.
For OV/LCP the TSYS are just bad and loading them from the file would be
useless, here is a quote from the log: "OV 7mm LCP data saturated system
temperatures". OV/LCP at 7mm is known to be dead. So that is just a loss, you
should flag that data and don't worry about the Tsys.
For HN, the TSYS are high and noisy in the TSM plots and there are no fringes to
HN on 3C345 or SGRA on HN. So again I think HN is a loss. They reported this
in the pi letter and investigated it and could not find the problem.
I talked to the analysts and they said the *cal.vlba file cannot is not designed
to have all the IFs for Mk4C projects.
Amy
Eduardo Ros wrote:
> New try...
>
> Begin forwarded message:
>
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>> *From: *Eduardo Ros <ros at mpifr.de <mailto:ros at mpifr.de>>
>> *Date: *August 9, 2012 12:13:15 AM GMT+02:00
>> *To: *Amy Mioduszewski <amiodusz at nrao.edu <mailto:amiodusz at nrao.edu>>
>> *Subject: **Re: [daip] [Fwd: Tsys table and antab file in experiments
>> BE061]*
>>
>>
>> Dear Amy,
>>
>> On Wed, Aug 08, 2012 at 03:37:54PM -0600, Amy Mioduszewski wrote:
>>> The analysts forwarded your messages to daip at nrao.edu
>>> <mailto:daip at nrao.edu>. The easiest
>>> thing to do is run VLOG on your be061bcal.vlba file, that will
>>> separate the file into different calibration files, including the
>>> TSYS part. VLOG also inserts any lines needed for ANTAB.
>>
>> I ran VLOG, this is not the problem. The thing is that some values
>> are missing. I have 8 IF for RCP and 8 IF for LCP in my data, but the
>> calibration tables only have 8 columns, not 16. I fear they belong to
>> R8 L8 R7 L7 R6 L6 R5 L5
>> (if I check the frequencies at the headers of the tsys file)
>> and that I am missing the IF 1 to 4 for bot hands, or
>> alternatively they are
>> R1 L1 R2 L2 R3 L3 R4 L4
>> and R5-8 and L5-8 are lost, but I am not sure. Maybe it is that they are
>> indeed
>> R1:2 L1:2 R3:4 L3:4 R5:6 L5:6 R7:8 L7:8
>> My fear was that the values were written with the old system and that
>> the newer digital system recorded other values, or they had a problem.
>>
>> In principle I could assume the first value for all, but for some
>> antennas I see a variation in the correlated amplitude through the band
>> which may be corrected with the Tsys (before going to a bandpass
>> correction),
>> and this could be fixed (as well as a better determination of the
>> opacity, needed for this experiment with phase-referencing and an accurate
>> comparison between three consecutive days on the Galactic Centre).
>>
>> In any case, the TY tables delivered together with the FITS file were
>> corrupted for some antennas and not usable.
>>
>> Best wishes from Bonn (summer stay),
>>
>> Eduardo Ros
>>
>>>>
>>>> Subject:
>>>> Tsys table and antab file in experiments BE061
>>>> From:
>>>> Eduardo Ros <eros at mpifr-bonn.mpg.de <mailto:eros at mpifr-bonn.mpg.de>>
>>>> Date:
>>>> Tue, 07 Aug 2012 17:16:54 +0200
>>>> To:
>>>> analysts at aoc.nrao.edu <mailto:analysts at aoc.nrao.edu>
>>>>
>>>> To:
>>>> analysts at aoc.nrao.edu <mailto:analysts at aoc.nrao.edu>
>>>>
>>>>
>>>> Dear VLBA analysts,
>>>>
>>>> I am trying to calibrate the data files for experiment BE061 (three
>>>> segments). I have noticed that the Tsys delivered with the files are
>>>> corrupt for some antennas (showing negative values for a complete
>>>> antenna, or completely crazy values). I have tried to upload those from
>>>> the calibration files and I fear that those were recorded with the old
>>>> system (100 MHz bandwidth) and are not enough for all IFs and all
>>>> polarisation hands.
>>>>
>>>> So I get from the summary file in SCHED:
>>>> Matching groups in /aux/vlb056a/p459kri/sched-10.1/catalogs/freq.dat:
>>>> v7mm_c8
>>>>
>>>> Setup group: 1 Station: VLBA_BR Total bit
>>>> rate: 2048
>>>> Format: MARK5B Bits per sample: 2 Sample rate:
>>>> 64.000
>>>> Number of channels: 16 DBE type: RDBE_PFB Speedup factor:
>>>> 1.00
>>>>
>>>> Disk used to record data.
>>>>
>>>> 1st LO= 42400.00 42400.00 42400.00 42400.00 42400.00 42400.00
>>>> 42400.00 42400.00
>>>> 42400.00 42400.00 42400.00 42400.00 42400.00 42400.00
>>>> 42400.00 42400.00
>>>> Net SB= L L L L L L
>>>> L L
>>>> L L L L L L
>>>> L L
>>>> Pol. = RCP LCP RCP LCP RCP LCP
>>>> RCP LCP
>>>> RCP LCP RCP LCP RCP LCP
>>>> RCP LCP
>>>> BBC = 1 2 3 4 5 6
>>>> 7 8
>>>> 9 10 11 12 13 14
>>>> 15 16
>>>> BBC SB= L L L L L L
>>>> L L
>>>> L L L L L L
>>>> L L
>>>> IF = A C A C A C
>>>> A C
>>>> A C A C A C
>>>> A C
>>>>
>>>> VLBA FE= 7mm omit 7mm omit
>>>> VLBA Synth= 15.4 7.6 11.6
>>>>
>>>> The following frequency sets based on these setups were used.
>>>>
>>>> Frequency Set: 1 Setup file default.
>>>> LO sum= 43248.00 43248.00 43216.00 43216.00 43184.00 43184.00
>>>> 43152.00 43152.00
>>>> 43120.00 43120.00 43088.00 43088.00 43056.00 43056.00
>>>> 43024.00 43024.00
>>>> BBC fr= 848.00 848.00 816.00 816.00 784.00 784.00
>>>> 752.00 752.00
>>>> 720.00 720.00 688.00 688.00 656.00 656.00
>>>> 624.00 624.00
>>>> Bandwd= 32.000 32.000 32.000 32.000 32.000 32.000
>>>> 32.000 32.000
>>>> 32.000 32.000 32.000 32.000 32.000 32.000
>>>> 32.000 32.000
>>>> Matching frequency sets: 1 2 3 4 5 6 7 8 9
>>>>
>>>> Track assignments are:
>>>> track1= 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28,
>>>> 30, 32
>>>> barrel=roll_off
>>>>
>>>> My headers are:
>>>> AIPS 1: Image=MULTI (UV) Filename=BE061B .FITLD . 1
>>>> AIPS 1: Telescope=VLBA Receiver=VLBA
>>>> AIPS 1: Observer=BE061B User #= 720
>>>> AIPS 1: Observ. date=17-MAY-2012 Map date=03-AUG-2012
>>>> AIPS 1: # visibilities 1912686 Sort order TB
>>>> AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN TIME1 BASELINE
>>>> AIPS 1: SOURCE FREQSEL INTTIM GATEID CORR-ID
>>>> AIPS 1: ----------------------------------------------------------------
>>>> AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
>>>> AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00
>>>> AIPS 1: STOKES 4 -1.0000000E+00 1.00 -1.0000000E+00 0.00
>>>> AIPS 1: FREQ 64 4.2992250E+10 0.75 5.0000000E+05 0.00
>>>> AIPS 1: IF 8 1.0000000E+00 1.00 1.0000000E+00 0.00
>>>> AIPS 1: RA 1 00 00 00.000 1.00 0.000000 0.00
>>>> AIPS 1: DEC 1 00 00 00.000 1.00 0.000000 0.00
>>>> AIPS 1: ----------------------------------------------------------------
>>>> AIPS 1: Coordinate equinox 2000.00
>>>> AIPS 1: Maximum version number of extension files of type HI is 1
>>>> AIPS 1: Maximum version number of extension files of type AT is 1
>>>>
>>>> A LISTR output gets:
>>>> ID Source Freq(GHz) Velocity(Km/s) Rest freq (GHz)
>>>> 1 All Sources 42.9923 0.0000 43.0240
>>>> IF( 2) 43.0243 0.0000 43.0240
>>>> IF( 3) 43.0563 0.0000 43.0240
>>>> IF( 4) 43.0883 0.0000 43.0240
>>>> IF( 5) 43.1203 0.0000 43.0240
>>>> IF( 6) 43.1523 0.0000 43.0240
>>>> IF( 7) 43.1843 0.0000 43.0240
>>>> IF( 8) 43.2163 0.0000 43.0240
>>>>
>>>> Frequency Table summary
>>>> FQID IF# Freq(GHz) BW(kHz) Ch.Sep(kHz) Sideband
>>>> 1 1 42.99225000 32000.0020 500.0000 1
>>>> 2 43.02425000 32000.0020 500.0000 1
>>>> 3 43.05625000 32000.0020 500.0000 1
>>>> 4 43.08825000 32000.0020 500.0000 1
>>>> 5 43.12025000 32000.0020 500.0000 1
>>>> 6 43.15225000 32000.0020 500.0000 1
>>>> 7 43.18425000 32000.0020 500.0000 1
>>>> 8 43.21625000 32000.0020 500.0000 1
>>>>
>>>> And the log files provide those values:
>>>>
>>>> Pulse-cal data:
>>>> Bei den Phase-Cal-Daten:
>>>> ! ----- PulseCal information for HN -----
>>>> ! Scan headings are Station id, Project, Source/Qualifier, and scan time
>>>> range.
>>>> ! Basically speaking, scan changes inside loops are ignored.
>>>> ! HN BE061B 3C345/0 138-05:45:00/138-05:49:59
>>>> FREQUENCY HN /
>>>> ! Tone Chan SB Pol ToneSkyFreq #bits LoFreq BW
>>>> 'T01' 1 'L' 'RCP' 43175.00 1 43176.00 16000.0
>>>> 'T02' 2 'L' 'LCP' 43175.00 1 43176.00 16000.0
>>>> 'T03' 3 'L' 'RCP' 43143.00 1 43144.00 16000.0
>>>> 'T04' 4 'L' 'LCP' 43143.00 1 43144.00 16000.0
>>>> 'T05' 5 'L' 'RCP' 43111.00 1 43112.00 16000.0
>>>> 'T06' 6 'L' 'LCP' 43111.00 1 43112.00 16000.0
>>>> 'T07' 7 'L' 'RCP' 43079.00 1 43080.00 16000.0
>>>> 'T08' 8 'L' 'LCP' 43079.00 1 43080.00 16000.0
>>>> ! HN BE061B 3C345/0 138-05:45:00/138-05:49:59
>>>> PULSE-CAL HN /
>>>> 138 05:45:44 'CC' 358.54 63.0
>>>> 138 05:45:44 'T01' 0.0083 -70.861
>>>> 138 05:45:44 'T02' 0.0044 138.044
>>>> 138 05:45:44 'T03' 0.0065 90.332
>>>> 138 05:45:44 'T04' 0.0014 -162.175
>>>> 138 05:45:44 'T05' 0.0043 163.171
>>>> 138 05:45:44 'T06' 0.0039 -57.179
>>>> 138 05:45:44 'T07' 0.0045 87.953
>>>> 138 05:45:44 'T08' 0.0035 130.505
>>>> 138 05:46:54 'CC' 358.60 63.0
>>>>
>>>> And TSYS data (the ones I wanted to read and give error):
>>>> ! HN BE061B 3C345/0 138-05:45:00/138-05:49:59
>>>> ! 1 7mm A RCP 1 L 776.00MHz 16M -43168.00MHz 9.34
>>>> ! 2 7mm C LCP 2 L 776.00MHz 16M -43168.00MHz 6.32
>>>> ! 3 7mm A RCP 3 L 744.00MHz 16M -43136.00MHz 9.27
>>>> ! 4 7mm C LCP 4 L 744.00MHz 16M -43136.00MHz 6.33
>>>> ! 5 7mm A RCP 5 L 712.00MHz 16M -43104.00MHz 9.21
>>>> ! 6 7mm C LCP 6 L 712.00MHz 16M -43104.00MHz 6.35
>>>> ! 7 7mm A RCP 7 L 680.00MHz 16M -43072.00MHz 9.14
>>>> ! 8 7mm C LCP 8 L 680.00MHz 16M -43072.00MHz 6.36
>>>> 138 05:45.517 189.0 187.5 186.5 188.2 187.2 183.7 174.1 186.7 ! 86.7
>>>>
>>>> My main question is, what should I index in a CONTROL block in ANTAB to
>>>> get the values properly? I got puzzled with the frequency blocks and
>>>> the data. Maybe those are more clear for you and you can give me the
>>>> recipe for getting proper TSYS values.
>>>>
>>>> Apart from that, the data look very fine, the POSSM plots on the
>>>> calibrators give very nice detections, etc.
>>>>
>>>> Thanks in advance for your help.
>>>>
>>>> Cheers,
>>>>
>>>> Eduardo Ros
>>>>
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>> _______________________________________________
>>>> Daip mailing list
>>>> Daip at listmgr.cv.nrao.edu <mailto:Daip at listmgr.cv.nrao.edu>
>>>> http://listmgr.cv.nrao.edu/mailman/listinfo/daip
>>
>>
>
> __________________________________________
> Prof. Dr. Eduardo Ros
> Associate Professor for Astrophysics
> Dept. of Astronomy, University of Valencia
> E-46100 Burjassot, Valencia - SPAIN
> mailto:Eduardo.Ros at uv.es
> ---
> Guest scientist
> Max-Planck-Institut fuer Radioastronomie
> Auf dem Huegel, 69
> D-53121 Bonn - GERMANY
> Tel: +49-228-525-292
> http://www.mpifr.de/staff/ros/
> ------------------------------------------
>
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