[evlatests] ea17, Ku-band, LCP

Rob Long rlong at nrao.edu
Wed Aug 16 10:51:08 EDT 2023


There was a problem with the LCP LNA biases. Dan Dillon corrected this.

Rob

On 8/16/2023 8:49 AM, Jim Ogle wrote:
> There were two JIRA tickets written up for ea17's Ku-band in that period, WO-17964 and WO-18001.
>
> Jim
>
>> Hi Rick,
>>
>> I see the problem on the 13th and the 17th. Prior to and after these dates,
>> the problem is gone. I'll see if there was an issue resolved on
>> ea17 in July. July 24th stress and beyond shows LCP and RCP about the same.
>>
>> Rob
>>
>> On 8/16/2023 8:43 AM, Vivek Dhawan via evlatests wrote:
>>> Rick, have a look at the stress test (single subband, but should show
>>> if lcp is worse). ill take a look when i get to internet at work
>>>
>>> On Wed, August 16, 2023 08:33, Rick Perley via evlatests wrote:
>>> | In calibrating data taken on July 17, I find that ea17, LCP, and
>>> | Ku-band is very weak, with Tsys about 700K at the low-frequency end,
>>> | somewhat better at the high frequency end.   RCP side is fine, so
>>> | we can't blame water in the horn...
>>> |
>>> | Is this an issue already known and repaired?
>>> |
>>> | Rick
>>> |
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>>>
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