[daip] FILLM question

[Eric Greisen]

Tracy - all AIPS questions go to daip.

Data Analysts writes:
 > 
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 > >From tracy.clarke at nrl.navy.mil  Sun Aug  7 15:49:36 2005
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 > Date: Sun, 7 Aug 2005 17:49:20 -0400 (EDT)
 > From: "Tracy Clarke (Foreign National)" <tracy.clarke at nrl.navy.mil>
 > X-X-Sender: tclarke at crazyhorse.nrl.navy.mil
 > To: analysts at nrao.edu
 > Subject: FILLM question
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 > Hi,
 > 
 >  	I was loading some A+PT data this afternoon and got an odd FILLM 
 > error I had not seen before. I haven't done A+PT 330 MHz before so don't 
 > know if this is common or not. Do you happen to know what the fillowing 
 > means:
 > 
 > FILLM2: MCCHED:  0/08:26:55.0  6 x 17  BAD GAIN EXPONENT      29
 > FILLM2: MCCHED:  0/08:26:55.0 21 x 17  BAD GAIN EXPONENT      29
 > FILLM2: MCCHED:  0/08:26:55.0 21 x 18  BAD GAIN EXPONENT      29
 > ...

Usually this happens when something is temporarily not working.  I put
in a test to catch this and flag the data - it used to abort sometimes
for illegal math operation.  The message only comes out when the data
were not flagged in some other way by the on-line system.  An exponent
of 29 would be 2**(-37) which would likely render the numbers as 0.0.
I suspect that there may have been bad interference even...

Eric Greisen