[evlatests] Antenna-based RFI at 1400 and 1408 MHz

[Dan Mertely]

Hi Rick.  We've not gotten-in close to these antennas
with a feedhorn & spectrum analyzer to look for this
RFI yet, but we'll do some checks next week.

-Mert


Rick Perley wrote:
>     ... Antenna 5 appears to be clean also. 
> 
> Ken Sowinski wrote:
>> On Fri, 6 Nov 2009, Rick Perley wrote:
>>
>>>    Inspection of WIDAR spectra reveal some RFI at 1400 and 1408 MHz,
>>> which clearly originates within our antennas.
>>>
>>>    I reproduce below what I reported back in July.  The situation has
>>> now changed a bit:
>>>
>>>    The 'guilty' antennas, listed below (1, 2, 3, 9, 18 and 25) are now
>>> completely clean.  No RFI is seen on any baseline connected to these.
>>> Antenna 24 also seems good.
>>>
>>>    The RFI is now found on most (if not all) of the other WIDAR
>>> connected antennas:  4, 5, 8, 15, 27 and 28.  Perhaps we didn't detect
>>> this earlier on these antennas due to fringe-rate attenuation.
>>> (D-configuration is very useful to find such problems).
>> Many of these antennas were not connected to Widar at that time.
>> ea05, ea15 and ea27 certainly; maybe ea04 and ea08 as well.
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