[daip] VLBABPSS

[Walter Brisken]

Hi DAIP (probably Amy?)

Tom and I are looking at some of his data that he is processing using the 
VLBA scripts in AIPS.  After running VLBABPSS it is apparent that nearly 
all of the LCP channels are getting flagged by the BPASS task.  If we tget 
BPASS to see the parameters that are used we find BPASSPRM(5) is set to 1, 
indicating desire to "divide by channel 0".  I worry that this is both 
unnecessary and potentially problematic.  Indeed, setting this parameter 
to 0 and running BPASS in its naked form results in sensible bandpasses.

Is this a known issue?  Are there reasons that "divide by channel 0" is 
actually the right thing to do?  Seems like any normalization that this 
helps accomplish will be undone first by the normalization specified by 
BPASSPRM(10), and later by ACSCL.  Maybe I'm missing something subtle?

 	-Walter

-- 
-------------------------
Walter Brisken
Director
Long Baseline Observatory
(575)-835-7133 (office)
(505)-234-5912 (cell)