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

[Ken Sowinski]

M<On Wed, 1 Feb 2012, Chuck Kutz wrote:

> Is antenna 1 being moved into the barn tomorrow?
>
> Chuck

A week from now, by Gene's schedule.


> -----Original Message-----
> From: evlatests-bounces at nrao.edu [mailto:evlatests-bounces at nrao.edu] On
> Behalf Of Rob Long
> Sent: Wednesday, February 01, 2012 2:09 PM
> To: Rob Long
> Cc: evlatests at aoc.nrao.edu
> Subject: Re: [evlatests] Noise Diode in ea01 at Q-band in LCP
>
> 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 ...