[evlatests] ea21 Panels

[George Moellenbrock]

Hi Rick-

Antenna 21 was the one that had an edge panel blown off on the morning 
of Oct 28 during the move from A to D config.  Looks like it was the 
edge above the quadrapod above the elevation yolk adjacent to the 
stairs.  This probably coincides with the right-hand side of your plot?

-George




On 7/9/20 11:58 AM, rperley via evlatests wrote:
> I'm analyzing the holography data, taken Jan 2019 and May 2020.
>
> Something is quite wrong with the outer panels on ea21.  Panels 6-1, 
> 6-2, and 5-1 are seriously (centimeters!) away from their proper 
> position.  The errors are far too large for Ka-band data to give us 
> the required answer, due to phase wraps.
>
> As seen from the front (looking into the dish), 6-1 and 6-2 are the 
> first and second panels in the outer right, counting clockwise from 
> the top.  5-1 is the first panel in the next ring in, counting from 
> the top.
>
> These errors are big enough that they ought to be visible to the eye.  
> Unfortunately, the antenna is now on E28, rather far out for a casual 
> visit.  But if somebody is going out that way, it might be good to look.
>
> The attachment shows the color-coded panel displacements.  Ignore the 
> large errors along the x- and y-axes -- these are due to the quad leg 
> shadows.  The area of interest is in the area of x = 2 meters, y = 11 
> meters.
>
> And if the misplaced panels are on the other side of the vertical -- I 
> really need to know that!!!
>
> Rick
>
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