[daip] MOJAVE BL149BE 512 Mbps problems summary
Yuri Y. Kovalev
ykovalev at mpifr-bonn.mpg.de
Fri Dec 26 11:19:48 EST 2008
Dear Amy,
I continued working on BL149BE and summarize here my experience and
suggestions. I hope that it will help to improve AIPS support of
512 Mbps (2-pass) VLBA experiments.
I use 31DEC08 AIPS version on an MPIfR server.
1. VBGLU has produced artificial amplitudes for FD-OV baseline after
gluing AIPS-friendly FITS files. You have confirmed this problem.
I solved it by using FITS-IDI files (vlbaload, vlbafix, VBGLU).
In this way no artificial amplitudes are produced.
However, one FITS-IDI file seemed to be corrupted.
AIPS was unable to read it in.
This is BL149BE FITS IDI file VSN005549_file40
This file is very small, only 115200 Bytes.
* I suggest to delete this file from the NRAO archive.
2. I have a general comment on the current realization of vlbafix.
For some reason, it applies FG table.
* I suggest not to apply FG table, to keep the uv data and the table
while doing vlbafix. This would give users much more flexibility, FG
table can be conveniently applied at any later moment.
3. VBGLU had more problems, unfortunately.
(i) It was unable to produce AT table with the following message:
GLUTAB TABLE: AT MISSING REQUIRED COLUMNS, FILE 1
* Could you please take a look at this problem?
(ii) CQ table was produced (merged) absolutely incorrectly with
artificial numbers all over the table.
(CQ tables were fine in FQ-1 and FQ-2 files after vlbafix.)
You can find the corrupted table as ASCII-OUT attached to this e-mail.
* Could you please take a look at this problem?
4. PC table data turned out to be useless, but nothing can be done
about it. Thanks to Leonid Kogan for explanations.
Dear colleagues, I would like to thank all of you for continuous support
and wish you all the best in the new year!
Cheers,
Yuri.
> On Fri, 12 Dec 2008, Amy Mioduszewski wrote:
>
> > Dear Yuri,
> >
> > I have downloaded your data and confirmed your problem. Every 10th or so
> > point has a very high amplitude and zero phase for those IFs after VBGLU. I
> > will continue to work on it.
> >
> > Amy
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XTENSION= 'BINTABLE' / extension type
BITPIX = 8 / printable ASCII codes
NAXIS = 2 / Table is a matrix
NAXIS1 = 1000 / Max. no. of characters/pass
NAXIS2 = 1 / Number of entries in table
PCOUNT = 0 / Random parameter count
GCOUNT = 1 / Group count
NOPASS = 1 / Number of passes thru table
TFIELDS = 14 / Number of fields in each row
EXTNAME = 'AIPS CQ ' / AIPS table file
EXTVER = 1 / Version Number of table
TBCOL1 = 9 / Starting char. pos. of field
TFORM1 = 'I11 ' / Fortran format of field 1
TFDIM1 = 1 / Dimension of field 1
TTYPE1 = 'FRQSEL ' / type (heading) of field 1
TUNIT1 = ' ' / physical units of field 1
TBCOL2 = 20 / Starting char. pos. of field
TFORM2 = 'I11 ' / Fortran format of field 2
TFDIM2 = 1 / Dimension of field 2
TTYPE2 = 'SUBARRAY ' / type (heading) of field 2
TUNIT2 = ' ' / physical units of field 2
TBCOL3 = 31 / Starting char. pos. of field
TFORM3 = 'I11 ' / Fortran format of field 3
TFDIM3 = 8 / Dimension of field 3
TTYPE3 = 'FFT_SIZE ' / type (heading) of field 3
TUNIT3 = ' ' / physical units of field 3
TBCOL4 = 42 / Starting char. pos. of field
TFORM4 = 'I11 ' / Fortran format of field 4
TFDIM4 = 8 / Dimension of field 4
TTYPE4 = 'NO_CHAN ' / type (heading) of field 4
TUNIT4 = ' ' / physical units of field 4
TBCOL5 = 53 / Starting char. pos. of field
TFORM5 = 'I11 ' / Fortran format of field 5
TFDIM5 = 8 / Dimension of field 5
TTYPE5 = 'SPEC_AVG ' / type (heading) of field 5
TUNIT5 = ' ' / physical units of field 5
TBCOL6 = 64 / Starting char. pos. of field
TFORM6 = 'D24.15 ' / Fortran format of field 6
TFDIM6 = 8 / Dimension of field 6
TTYPE6 = 'EDGE_FRQ ' / type (heading) of field 6
TUNIT6 = 'HZ ' / physical units of field 6
TBCOL7 = 88 / Starting char. pos. of field
TFORM7 = 'D24.15 ' / Fortran format of field 7
TFDIM7 = 8 / Dimension of field 7
TTYPE7 = 'CHAN_BW ' / type (heading) of field 7
TUNIT7 = 'HZ ' / physical units of field 7
TBCOL8 = 112 / Starting char. pos. of field
TFORM8 = 'A64 ' / Fortran format of field 8
TFDIM8 = 64 / Dimension of field 8
TTYPE8 = 'TAPER_FN ' / type (heading) of field 8
TUNIT8 = ' ' / physical units of field 8
TBCOL9 = 179 / Starting char. pos. of field
TFORM9 = 'I11 ' / Fortran format of field 9
TFDIM9 = 8 / Dimension of field 9
TTYPE9 = 'OVR_SAMP ' / type (heading) of field 9
TUNIT9 = ' ' / physical units of field 9
TBCOL10 = 190 / Starting char. pos. of field
TFORM10 = 'I11 ' / Fortran format of field 10
TFDIM10 = 8 / Dimension of field 10
TTYPE10 = 'ZERO_PAD ' / type (heading) of field 10
TUNIT10 = ' ' / physical units of field 10
TBCOL11 = 201 / Starting char. pos. of field
TFORM11 = 'I11 ' / Fortran format of field 11
TFDIM11 = 8 / Dimension of field 11
TTYPE11 = 'FILTER ' / type (heading) of field 11
TUNIT11 = ' ' / physical units of field 11
TBCOL12 = 212 / Starting char. pos. of field
TFORM12 = 'E15.6 ' / Fortran format of field 12
TFDIM12 = 8 / Dimension of field 12
TTYPE12 = 'TIME_AVG ' / type (heading) of field 12
TUNIT12 = 'SECONDS ' / physical units of field 12
TBCOL13 = 227 / Starting char. pos. of field
TFORM13 = 'I11 ' / Fortran format of field 13
TFDIM13 = 8 / Dimension of field 13
TTYPE13 = 'NO_BITS ' / type (heading) of field 13
TUNIT13 = ' ' / physical units of field 13
TBCOL14 = 238 / Starting char. pos. of field
TFORM14 = 'I11 ' / Fortran format of field 14
TFDIM14 = 8 / Dimension of field 14
TTYPE14 = 'FFT_OVLP ' / type (heading) of field 14
TUNIT14 = ' ' / physical units of field 14
NO_IF = 8
TABREV = 1
HISTORY TBOUT /CQ table version 1 of INNAME='BL149BE .UVDATA. 1'
HISTORY TBOUT / copied to the text file U:CQ_BAD
HISTORY TBOUT / 26-DEC-2008 15:39:57
END
COL. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ROW FRQSEL SUBARRAY FFT_SIZE NO_CHAN SPEC_AVG EDGE_FRQ CHAN_BW TAPER_FN OVR_SAMP ZERO_PAD FILTER TIME_AVG NO_BITS FFT_OVLP
NUMBER HZ HZ SECONDS
***BEGIN*PASS***
1 16 16 8 0 1179209301 1.532555250000000D+10 5.000000000000000D+05 'UNIFORM UNIFORM UNIFORM UNIFORM ' 256 8 0 1.966080E+00 2 0
1 '' '' 8 0 541938255 1.533349000000000D+10 5.000000000000000D+05 '' 256 8 0 1.966080E+00 2 0
1 '' '' 8 0 1179209301 1.534155250000000D+10 5.000000000000000D+05 '' 256 8 0 1.966080E+00 2 0
1 '' '' 8 0 541938255 1.534949000000000D+10 5.000000000000000D+05 '' 256 8 0 1.966080E+00 2 0
1 '' '' 256 16 1179209301 1.535755250000000D+10 5.000000000000000D+05 '' 0 0 0 1.966080E+00 2 0
1 '' '' 256 16 541938255 1.536549000000000D+10 5.000000000000000D+05 '' 0 0 0 1.966080E+00 2 0
1 '' '' 256 1179209301 1 1.537355250000000D+10 5.000000000000000D+05 '' 0 0 0 1.966080E+00 2 0
1 '' '' 256 541938255 1 1.538149000000000D+10 5.000000000000000D+05 '' 0 0 0 1.966080E+00 2 0
***END*PASS***
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