[daip] Some oddities from IMAGR

[Eric Greisen]

On 06/21/2014 04:00 PM, Craig Walker wrote:
> I don't see anything wrong with the images, but I'm seeing some strange
> spewings to the terminal from IMAGR.  The data set is a simple VLBA
> 2 Gbps set with the RDBE PFB at 6cm.  There are just under 200000 vis.
> I'm using a SPLIT output with averaging across channels in an IF, but
> not across each of the 8 IFs.
>
> IMAGR1: Task IMAGR  (release of 31DEC14) begins
> IMAGR1: UVGET: Using flag table version   2 to edit data
> IMAGR1: Create J1504+1029  .UVWORK.  26 (UV)  on disk  3  cno   78
> IMAGR1: Beginning channel    1 through    1 with  8 IFs
> IMAGR1: IMACPY: found     1528956. of     1574800. possible channels
> IMAGR1: IMACPY: average frequency is then   4980.354 MHz
> IMAGR1: IMACPY: Copied   196850 visibilities to be imaged
> IMAGR1: QINIT: did a GET  of      5120 Kwords, OFF   17454778945611
>
> The number of channels looks goofy, but I guess it is about the
> number of vis times the number of IFs (8).  Maybe that's ok.
> What does the QINIT line refer to?
>
> The image header has the following.  Check WTNOISE and SUMTIN.  Are they
> reasonable?  They seem suspicious:
>
> AIPS 1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
> AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    0.00
> AIPS 1: Maximum version number of extension files of type CC is   1
> AIPS 1: Maximum version number of extension files of type CG is   1
> AIPS 1: Maximum version number of extension files of type HI is   1
> AIPS 1: Maximum version number of extension files of type PL is   1
> AIPS 1: Keyword = 'WTNOISE '  value =  5.429538E+15
> AIPS 1: Keyword = 'SUMWTIN '  value =  1.690504E+11
> AIPS 1: Keyword = 'CCFLUX  '  value =  7.614199E-01
>
> This is on my work machine so you could access the data fairly easily
> (noatak, user 332).
>
> Cheers,
>
> Craig

The WTNOISE and SUMWTIN look very bizarre - but I think you have your 
adverbs messed up.  The channel 1 through 1 with 8 IFs means that you 
averaged channel 1 frmm each of the IFs not what your initial words seem 
to imply.  Say you have 64 channels.  The adverbs should be bchan=1; 
echan =64; nchavg=64; bif=1; eif = 1.  You must run it 8 times once for 
each IF.

Let me know what happens.

Eric