[evlatests] 'Missing' panels on ea21

[Rick Perley]

... and ea20 has almost the best shape of any antenna.  So the refitting of the panels was done very well.  

I’ll be reviewing the 2017 data today, so we’ll find out more.  

Rick

Sent from my iPad

> On May 20, 2021, at 5:49 AM, Dave Parker <dparker at aoc.nrao.edu> wrote:
> 
> Sorry, found some old forms and it was Ant 20 that lost the panels.
> 
> Dave
> 
>> On 5/20/2021 5:46 AM, Dave Parker via evlatests wrote:
>> I antenna 21 the antenna that had a panel blow off in high winds a year or two ago, and was holography done on it after it was reinstalled?
>> Dave
>>> On 5/19/2021 3:01 PM, rperley via evlatests wrote:
>>> I'm reviewing all the surface holography taken over the past three years.  The good news is that there is ample evidence that the panels don't change over this period of time, so that once we've made our 'best' adjustments, no more adjustments will be needed for a long time.
>>> 
>>> The 'bad' news is that something is quite amiss with ea21.  We're getting no signals from two panels - this is seen in both the Jan 2019 and May 2020 data.
>>> 
>>> Of course, these panels cannot be 'gone' (one hopes that somebody would have noticed this, were that the case ...).  What has happened is that the two panels are tilted so much that we don't get a coherent signal over the resolution of the measurements.
>>> 
>>> The two panels are in the outermost right, and, as seen from the front, looking into the dish, are the top two panels on the right side of the quad leg.
>>> 
>>> It would be useful for somebody to look at these -- the effect will be very slight, so don't expect an obvious tilt.  It takes only a couple of millimeters of slope, over the extent of the panel, to make it 'disappear'.
>>> 
>>> Rick
>>> 
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