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

[Rick Perley]

    ... 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.