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

[Ken Sowinski]

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.