[evlatests] P-band Dipole Orientations

[Rob Long]

Hi Rick,


It looks like our main dipole culprit is ea01. The dipole itself is not 
orthogonal (elements twisted) and we are going to have to get with the 
mechanics to get it removed so we can align it or install the spare.


ea11 (on the other hand) looks to be aligned well (if you wanted to use 
it as a reference).


Rob



On 9/10/2024 3:43 PM, Rick Perley via evlatests wrote:
> Ther results of a polarization calibration of a recent P-band dataset 
> (obtained via VLITE) indicate a significant number of antennas with 
> apparently misaligned feeds.
>
> As this was a VLITE database, there were only 18 antennas included, 
> one of which was out of service.  For the seventeen others, the 
> calibration shows seven antennas misaligned by more than 5 degrees 
> w.r.t. the reference dipole (ea01).  They are:
>
> ea17  5.7 degrees
> ea07  8.6
> ea11  10.3
> ea20  5.7
> ea23  5.2
> ea27  8.0
> ea21  8.6
>
> It is my impression (but I do not have the data in hand to prove it) 
> that this is worse than what was seen a few years ago.
>
> These misorientations should be easily visible from the antenna 
> surface.  It would be good to know if visual inspection agrees with 
> the observations.
>
> Rick
>
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