[daip] Ringing from BPASS

[Eric W Greisen]

Ingyin Zaw wrote:
> Hello,
>
> The ringing problem I was having seems to be caused by POSSM (instead 
> of the solutions from BPASS). When I look at the scan on which I ran 
> BPASS, with doband 1 in POSSM, I see ringing in baselines to Ant 12 
> (VLA phased array), strongest in the FD-Y and GB-Y baselines. However, 
> when I apply the BP table with SPLAT to the data and look at the same 
> scan in the SPLAT file with POSSM, it shows no ringing.
>
> Here are two files for testing:
> (1) BK114A_2145_BP.FITS: contains the scan on which I ran BPASS and 
> the BPASS table (BP 1).
> (2) BK114A_2145_SPLAT.FITS: File (1) with BP1 applied using SPLAT.
>
> Note: Both files have CL tables from previous calibrations. Applying 
> or not applying a CL table does not change the presence/absence of 
> ringing.
> However, if you'd like to use a CL table, please use CL 7.
>
> To get the files, please ftp from:
> cfa-ftp.harvard.edu
> USER: anonymous
> PASS: <youremailaddress>
> cd incoming/lincoln
>
I am home sick at present but will look at this in time.  It is rather 
strange since POSSM and SPLAT both use
exactly the same subroutines to fetch and calibrate the data.  Are you 
sure that you did not do something different
between the two?

Eric Greisen