[evlatests] slow attenuator setting on ea16 IF D

[Keith Morris]

Good point.

T304-c also shows power changes (~6dB) that correspond to the 1st step 
change in Claire's plot.  Did this show up in the gain plots?

Only T304-d shows any power changes that correspond to the 2nd step 
change in Claire's plot.  No T304s show any changes at the 10:25 mark, 
when the 3rd step change occurred.



Claire Chandler wrote:
> Why would this only affect IF D, and not A/B/C?
> 
> Claire
> 
> On Mon, 8 Aug 2011, Doug Whiton wrote:
> 
>>> I would consider a sticky subreflector that moves a little further
>>> each time it is commanded until it finally gets there.
>>>
>> I witnessed this just last Friday.  I noticed that Ants. 11, 12, 13, 16
>> and 27 were having difficulty settling into position.  They would move to
>> within a few counts on either side of the intended position, waiting about
>> 15-20 seconds between each try, then overshoot to the other side.  I
>> talked with Wayne about this.  He said that a firmware change and possibly
>> a hardware change would be necessary if we wanted to fix this.
>>
>> Doug
>>
>>
>>
>>
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-- 
Keith Morris
National Radio Astronomy Observatory
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