[evlatests] Quasi-calibrated visibilities and weights!

[Barry Clark]

It seems unlikely that a presumed efficienty would be too low.  If
both right and left are indicating similar gain anovalies, it would
seem to me to indicate that the cal source itself or the cal coupler
has become deranged.  Is it worth the effort to send somebody upstairs
with hot and cold loads to check?

Rick Perley wrote:
>     It appears some troubles (most hidden from public view! :) 
> concerning proper application of the 'switched power' quantities are now 
> behind us.   The raw visibilities and weights offered by BDF2AIPS, after 
> passing through Eric's latest version of TYAPL, are now in real Jy 
> (visibilities) and (1/Jy)^2 (weights), as they should be. 
> 
>     One nice advantage of this is that we can quickly find antennas 
> whose TCals or presumed efficiencies are 'out of line'. On a short test 
> database taken at noon today, of 3C454.3 at Ka-band, the post-TYAPL 
> visibilities are mostly near the correct value  of 38 Jy, but three 
> antennas are far away:  Antennas 17 and 26 give visibilities which are 
> much too low, and antenna 14 gives visibilities which are much too 
> high.  For the former, either the listed TCals are too low, or the 
> presumed antenna efficiency is too high.  For the latter, the inverse 
> applies. 
> 
>    
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