[daip] WSRT/AIPS

[Lawrence Rudnick]

Eric - thanks!  I think this will do the trick.  We're back in 31Dec04, 
so will do the SPLAT,SPLIT,MULTI,DBCON route.  (Yes, the data sets are 
enormous).  Eventually, we'll update to '06, so a SPLAT functionality 
would be great.
lr


Eric Greisen wrote:

>Lawrence Rudnick writes:
> > Eric -  grad student Shea Brown and I are trying to reduce some 
> > multisource Westerbork data in AIPS, with 8 IF bands of 64 channels 
> > each.  We want to do the following:
> > 
> > 1) run hanning smoothing on the spectra
>
>    Task SPLAT with SMOOTH set (all other docals false) and
>multi-source output will do the Hanning.
>
> > 
> > 2) select every other channel, post hanning, throw others away
>
>    CHINC does not seem to be in SPLAT where it should be - there is
>an option to average channels.  One would like what SPLIT has - which
>has both average N channels and increment by CHINC (so average 1
>increment 2 for you).  But SPLIT breaks all apart and you would have
>to put them all back together with MULTI and DBCON.
>
>    Are you running 31DEC06?   I think I will look at changing SPLAT.
>
>    You could keep all channels for now unless the data sets are
>really too large.  It might even help in the imaging.
>
> > 
> > 3) flag the remaining data for RFI
>
>    Consider task FLAGR
>
> > 
> > 4) proceed with normal bandpass, etc, calibration
>
>     Note that there are special things in SETJY effectively for WSRT
>(equitorial telescopes w linear polarization).  If you lie to SETJY
>and give a V flux for the cal (which is its linear polarization) then
>you will correctly cal XX and YY.
>
>Eric Greisen
>
> > 
> > Are steps 1 and 2 possible in AIPS?   Thanks.    Larry
> > 
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