[daip] Your query of the analysts

[Hau Yu Liu]

Dear sir,

   Thanks very much for help. I had also checked the VLA ovservational status summary
published at 2007 and find
the meaning of '2AD'. However, when I load the archived data AK138, I also
couldn't get the 'LL' while the observation scan shows there is some. The
correlator mode is '2A', but I can't find it from the status summary.
I'm guessing whether '2A' means 'AA' & 'CC'. But I can't get the 'CC' part from 
the archived data. Some other archived data with only one IF and only RCP polarization
always use the correlator mode '1A'. Did I miss anything or do FILLM incorrectly?

best wish,
Hauyu

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---------- Original Message -----------
From: Eric Greisen <egreisen at nrao.edu>
To: Hau Yu Liu <hyliu at asiaa.sinica.edu.tw>
Cc: daip at nrao.edu
Sent: Tue, 21 Oct 2008 08:45:47 -0600
Subject: Re: [daip] Your query of the analysts

> Hau Yu Liu wrote:
> >
> > 
> >>From the scan listed on the VLA data archive website, this archived data contains
> > two IF band with frequency 23.69GHz and 23.72 GHz, respectively. And each of them
> > had been measured in 'RR' and 'LL'.
> > However, after loading the data into AIPS, I got two UV line data, with 23.69GHz band
> > in one file and 23.72GHz in the other. But the first file only contains 'RR' 
> > correlation, and the second file contains only 'LL' correlation.
> 
> You have not read the archive pages correctly.  The data were taken in 
> VLA mode 2AD.  This produces line data in RR at IF 1 and line data in LL 
> in IF 2, just as you have found after FILLM.  The archive pages do not 
> explain the modes well, and people not familiar with the VLA may have to 
> go to other web pages to find what the modes mean.  (In fact, I went 
> down the hall to a true expert to confirm this information before 
> responding to you.)
> 
> Eric Greisen
------- End of Original Message -------