[evlatests] Noise Diode in ea01 at Q-band in LCP

Rob Long rlong at nrao.edu
Wed Feb 1 16:08:45 EST 2012


Looks like K-band (T303) is fine on antenna 1. It appears that Q-band 
LCP has a problem.

Rob

Rob Long wrote:
> It looks like LCP side of Q-band doesn't have any signal! I am trying to 
> run K-band now to make sure it isn't a T303.
> 
> Rob
> 
> Rick Perley wrote:
>>     The switched power from ea01 at Q-band in LCP is extremely weak, 
>> especially at the high frequency end.  At 48 GHz,  we are seeing only 
>> .006 counts -- about 5% of the other IFs.  At 42 GHz, it is about 10% of 
>> normal.  At the same time, the summed power is also too low -- about 1/5 
>> of the other antennas.  This shouldn't happen, unless the T304 
>> attenuators are set to the lowest values possible.  Something is not 
>> right here ...
>>
>>
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