[daip] [forwarded from Shinji Horiuchi] FITLD errors

[Leonia Kogan]

Hello,

FITLD can not load the data if the product pol * IF * chans >4096.
You have this product as large as 16384.

The limit 4096 works fine if the data are correlated at the VLBA correlator 
because the number of channel should be less 1024 at this case.

I can recomend you the two ways yo get around the problem.
At both ways you need to create the private version of FITLD.
I need to speak with other (better) AIPS people to say you whether we can 
modify the system version of FITLD

The way number 1.

Inside of the FITLD (just at the beginning) change the card:

      PARAMETER (LMXCIF=4096)

to 

      PARAMETER (LMXCIF=16384)

The possible problems on this way:
It is quite possible that other AIPS tasks will not work with such a huge 
product.

The way number 2.

Inside of the subroutine GET3DT (of FITLD comment the following cards

      IF (NUMWT.GT.LMXCIF) THEN
         WRITE (MSGTXT,1000) NUMWT
         IERR = 1
         GO TO 990
         END IF

In this case you should repeat FITLD 4 times selecting half of the
frequency channels and one IF or quarters of the frequency channels and
both IFs.

The possible problems on this way:
It is quite possible that FITLD still will not work but if it does, then 
there will not be a problem with other AIPS tasks. 

Leonia

Let me know if you do not know how to create a private version of an AIPS task


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From: Shinji Horiuchi <Shinji.Horiuchi at jpl.nasa.gov>
To: pmurphy at NRAO.EDU
Subject: FITLD errors
Date: Wed, 31 Oct 2001 11:31:01 -0800
Message-Id: <v04210a01b806006c4582@[137.78.152.175]>

Hello,

  I have a question on FITLD. I have a VSOP experiment recorded in VLBA 
format, copied to S2 and correlated at Penticton. This is a spectral line 
experiment with 8192 channels for each of 2 IFs. As in the following email 
to Penticton I can not load the FITLD file by FITLD, and Penticton people 
do not know why. The error message says "chans   16384 too many, get AIPS 
Manager ". Does AIPS has limit in number of channels to deal with FITLD? 
Thank you in advance for answering to this question.

Cheers,

Shinji.

>Date: Tue, 23 Oct 2001 15:39:24 -0800
>To: VLBI Operator <vlbiop at hia.nrc.ca>
>From: Shinji Horiuchi <Shinji.Horiuchi at jpl.nasa.gov>
>Subject: Re: W327c
>Cc:
>Bcc:
>X-Attachments:
>
>Dear Rob,
>
> I am sorry for this rate answer. I have been trying to load the data with 
>FITLD of AIPS (ver 12DEC00) but it always failed. It says
>
>  FITLD1: Sky frequencies (MHz) before re-ordering occurs:
>  FITLD1: Incoming FREQID #   1
>  FITLD1:  1608.00   1655.00
>  FITLD1: IMREF1: NUMBER KEYWORDS  51 NOT EXPECTED 12
>  FITLD1: CL table interval set at  1.00 minutes
>  FITLD1: GET3DT: # pol * IF * chans   16384 too many, get AIPS Manager
>  FITLD1: UT2UV: ERROR   1 TRANSLATING UV BINARY TABLE
>  FITLD1: ERROR      1 RETURNED FROM BTRTAB
>  FITLD1: Purports to die of UNNATURAL causes
>
>Then I tried to reduce the number of IFs and channels to load with FITLD 
>inputs BIF,EIF or BCHANNEL, ECHANNEL, but it always ended up with the same 
>results. What do you suggest to do? Could you make sure if you can load 
>the data into AIPS at Penticton?
>
>Cheers,
>
>Shinji Horiuchi.

***************************************************
Shinji Horiuchi
Mail Stop 238-332, Jet Propulsion Laboratory (JPL),
4800 Oak Grove Drive, Pasadena, CA 91109, USA.
email: shoriuchi at mail1.jpl.nasa.gov
Tel +1-818-354-4909, Fax +1-818-393-6890
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