[evlatests] WIDAR baselines, and time offsets

[Rick Perley]

    I had it right the first time.  The image is inverted, in both axes, 
about the phase center.  This corresponds to flipping the sign of the 
visibility phase -- a complex conjugation. 

George Moellenbrock wrote:
>
>>    1)  My error on the 'conjugation'.   Both real and imaginaries have
>> their signs reversed to get an apparent 180 rotation.
>
> NO!!  Changing the sign of both real and imaginary (globally) would
> get you a negative image.
>
> If the only problem were a reflected image (i.e., dynamic range ok), then
> the answer is simply to change the sign of the phase for all 
> visibilities.
>
> I don't think this is the whole answer because the dynamic range is 
> still bad.  I think a minority of baselines don't need the phase sign 
> change (a sufficient minority that calibration sort-of works), and I 
> think it is related to the antenna/baseline sorting....
>
> Michael/Bryan: Is there a way to turn off the deliberate sorting done 
> in the CBE?
>
> -George
>