[daip] please, help!

[Eric Greisen]

Vladimir Shoutenkov wrote:
> Dear Colleagues,
> 
> 
> there are two sources: 0528+134 and 1055+018. The first one have been
> calibrated in 2007, the second one - in 2011.
> 
> For the second source It's OK. But for the first source task PRTUV gives
> wrong "Wt":
> 
> Source= 0528+134    Freq=   4.975458609    Sort= TB           1   RR
> 1   LL             1   RL             1   LR
>   Vis #     IAT      Ant  Su Fq U(klam) V(klam) W(klam)   Amp  Phas
> Wt   Amp  Phas     Wt   Amp  Phas     Wt   Amp  Phas     Wt
>  
>       1  0/08:12:46  5- 6  1  0   65047   35387  -36338   1.272
> -4*******   1.275  -4*******   0.092 -46*******   0.051 -63*******
> 
> 
> Can you tell me what is a problem? Is it possible to do something?
> 
> Thank you in advance.
> 
> Vladimir Shoutenkov,
> Pushchino Radio Astronomy Observatory, Russia.
> 
> 
> P.S. The output lists for these sources are in attachment.

The adverb DPARM(2) tells PRTUV the maximum weight to expect.  After 
calibration your weights may be rather larger than 9.9.  The weight is 1 
over uncertainty squared.  Thus if your uncertainty is 0.1 Jy the weight 
is already 100.  Try setting DPARM(2)=1000 to see if it then shows 
reasonable weights.

Eric Greisen