[daip] UVCON error message

[Leonia Kogan]

Hi Sean,

I have added defaults for APARM(7) and APARM(10)

APARM(7)=0 => APARM(7)=1..e6
UVCON calculates the number of the time point as: NUMT = 
(HMAX-HMIN)/APARM(7) + 1
So the big default APARM(7)  generates only one time point.
Therefore APARM(7)=0 corresponds now to snapshot observation neah hour 
angle Hmin.

APARM(10)=0 =>APARM(10)=1
APARM(10) is maximum fractional blockage of one antenna by another one. 
By this definition maximum possible blockage is equal 1. Therefore the 
default of  the APARM(10)  is ignore any blockage.

The other APARM s have a right for zero default:
APARM(4,5) Hmin,Hmax. Zero means zero of Hmin or Hmax, why not?
APARM(3) source declination   can be zero. why not ?
APARM(6)  minimum antenna elevation can be zero, why not

The new version of UVCON will be available tomorrow through the MNJ.

Thnak you very much for paing my attention to this.

Leonia


Sean.Dougherty at nrc-cnrc.gc.ca wrote:

>Leonid,
>
>Thanks for the ideas. With your email, and checking the history of the
>output uv files where I have successfully run uvcon in the past, I see
>that aparm *must* be set carefully - especially aparm(7). If aparm(7)=0.0,
>then the program generates an error message. Also aparm(4,5) are required
>if the user wants to generate any visibilities!
>
>Now that I have UVCON running, I must say that it would be especially
>useful if there was at least a trap for APARM(7)=0.0, or even a non-zero
>default value. Likewise for APARM(4,5)=0. Moreover, the error message that
>aips generates offers no clue to the problem with the input parameters,
>though this fault can be directed at a number of tasks.
>
>Once again, many thanks for your help in getting me out of my mess. In
>hindsight it seems so trivial, most especially since I have run UVCON many
>times in the past - admittedly over 8 months ago.
>
>Thanks
>
>Sean
>PS. My apologies for Leo - I am working currently with a compatriot of
>yours who is also Leonid, but everyone seems to call him Leo. For certain,
>I'll not make the mistake again!
>
>  
>
>>Sean,
>>
>>It is absolutely wrong idea using APARM=0 in UVCON.!
>>
>>APARM(1,2)=0 => wavelength=1mm.  This is fine if actually want 1mm
>>APARM(3) = 0  => the source declination =0. This is fine if actually want
>>0
>>APARM(4,5) = 0 => both min and max hour angles are zero => Time
>>interval=0. I doubt you want it.
>>APARM(6) = 0   => Minimum elevation is 0. This is fine if actually want  0
>>APARM(7) = 0   => Integration time (time separation) is 0 => number of
>>time point (Hmax-Hmin)/APARM(7)+1 is not determined:  0/0+1
>>APARM(8) = 0 => Bandwidth=1MHZ.  It is fine if you actually want !MHz
>>APARM(9) = 0 => Nchan=1. It is fine
>>APARM(10) =0  May be correct but better using 1
>>
>>So use APARM with the values you want., especially APARM(4,5,7).
>>
>>       Still send me the list of all input parameters.
>>       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>I want to see what do you use specifically at CMETHOD, CMODEL, BCOMP,
>>NCOMP...
>>
>>Is there CC table attached toyour model? If you want to use CC table as
>>the model you have to determine INVERS.
>>
>>So.
>>
>>1. Use the right values for APARM
>>2. Check other parameters as well ( I can give you advise having
>>received the list
>>3. Run UVCON Using model determined at SMODEL (IN2NAME=' ')
>>4. Run UVCON with the actual model but with right inputs:APARM, INVERS
>>BCOMP, NCOMP, CMETHOD, CMODEL,
>>
>>
>>
>>Sean Dougherty wrote:
>>
>>    
>>
>>>Leo,
>>>
>>>The parms I used in UVCON are APARM 0; BPARM -1,0. The rest are just
>>>input related.
>>>
>>>The input model can be found at
>>>ftp://ftp.drao.nrc.ca/pub/smd/wr140_0.02_8.4.fits
>>>
>>>Thanks,
>>>
>>>Sean
>>>
>>>Leonia Kogan wrote:
>>>
>>>      
>>>
>>>>Sean,
>>>>
>>>>As I understand now the problem is not at the output text file
>>>>but at the output UV data file. May be you want to have it too big
>>>>(check APARM(4,5,7,8,9).
>>>>
>>>>Anyway send me the input file you use, UVCON inputs and I look it
>>>>tommorow evening.
>>>>
>>>>Leonia
>>>>
>>>>
>>>>        
>>>>
>>
>>    
>>