[daip] [!5492]: aips - BPASS mystery end channel problems

[Tracy Clarke]

Tracy Clarke updated #5492
--------------------------

BPASS mystery end channel problems
----------------------------------

           Ticket ID: 5492
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/5492
           Full Name: Tracy Clarke
               Email: tracy.clarke at nrl.navy.mil
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 14 September 2014 04:32 AM
             Updated: 15 September 2014 05:56 PM
      Resolution Due: 23 September 2014 12:00 AM (7d 6h 3m)



Hi Eric,

For User 1014, disk 2, file 4 I did a uvcop of channels 32 to 320 (289 channels) and the header has 289 channels but
when I do a POSSM just to look at the cross correlation data closely I only see data up to channel 288. That may 
reflect the fact that I did apply a flag to channel 289 but when I run a BPASS on that UVCOP data I get solutions up to
channel 287, nothing in 288 and then a huge number in 289. This is VLITE but the behavior is similar to WIDAR. I guess I just 
can't understand what is going on in that end channel and if it means something is wrong with the rest of the data. In this case the end 
channel (320) is in the band and before the MUOS satellite band that his very high. I see no reason that should blow up. It is pretty close
to MUOS so perhaps I should cut inside this at channel by several more since I had misremembered the channel to chose 
because we changed the spectral resolution.

BPASS1:   285        3.22      4.37          1.46       2.03         0
BPASS1:   286        3.13      4.48          1.46       2.00         0
BPASS1:   287        3.19      4.60          1.46       2.04         0
BPASS1:   289    18223.63  37324.98         69.98      79.35         0
BPASS1: BASOLV:   14 flagged channels in IF  1
BPASS1: BASOLV: will attempt to interpolate across band


------------------------------------------------------
Staff CP:  https://help.nrao.edu/staff