[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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