[evlatests] Antenna 24, at C band is HOT!

[Rick Perley]

    And this also explains the problem noted in the WIDAR0 data -- low 
amplitudes and a periodicity in the amplitudes. 



Chuck Kutz wrote:
> Dan Mertely wrote:
>> There is a maint form on ant 24 C band.  The internal
>> heaters turn on without intended command.  It sounds
>> like it's doing it again.  I'll let Cryo know.
>>
>> -Mert
>>
>>
>> Rick Perley wrote:
>>  
>>>     Antenna 24, all IFs, at C-band is showing sensitivity low by 
>>> about a factor of four.  It is showing normal sensitivies at K, Ka, 
>>> and Q bands.     The cause is easy to find -- the system temperature 
>>> is about 300 K.
>>>     Rick
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>>>     
>>
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>>   
> Guys,
>
> The Cryo group is aware of this and Front End Group has been working 
> on this issue.
> Yes, there is a maint form open on this receiver for this very thing. 
> We have been trying to solve the issue. The card cage was swapped out 
> a few weeks ago, but it is still doing it. We went out today with yest 
> another card cage.
> Although it may seem hard to believe, it undeniably turned out to be 
> the F317 slot that the card cage was plugged into. Interrupting the 
> power would result in the heaters being on when the power was 
> reapplied (a purposeful glitch) the power when the receiver was 
> plugged into its designated slot. Due  limited availability, we just 
> moved the receiver to a different slot. We will let Wayne know.
>
> Chuck