[evlatests] Birdie at 1875 MHz

[Rick Perley]

    'Late last month' = 25 August.

    More evidence casts some doubt on these explanations ... 
    The birdie is seen on many baselines -- all of them including 25 or 
26 -- but if due to something emanating from either these two, or from 
the local area, we should not see the birdie on long baselines -- i.e., 
on baselines including the antennas at the ends of the N or S arms.

    But we do -- there are good detections on baselines including ea27 
(at N18). 

    So my next theory has the emanation being internal to some of the 
antennas, the two strongest of of which happen to be ea25 and 26. 

Ken Sowinski wrote:
> On Wed, 25 Sep 2013, Rick Perley wrote:
>
>>    Perusal of spectral plots from L-band data taken late last month
>> reveals a weak birdie at 1875.0 MHz.  It is visible on many baselines
>> comprising ea25 and ea26.  The birdie is by far the strongest on
>> baseline ea25 x ea26.
>>    These two antennas were located at W12 and W14 -- hence the evidence
>> is pretty strong that this birdie is coming out of the technical
>> services area.
>
> Or the new ACU of 'late last month' means when the ACU consultant
> was here in August.  Those antennas bracket the master pad.