[evlatests] 36 GHz 'RFI'

[Emmanuel Momjian]

Perhaps it is worth noting that antenna 10 had a couple of internal birdies
at Ka-band, and one of them was at 36286 MHz (very close to the frequency
that Rick has reported for antenna 22's birdie). See
http://science.nrao.edu/evla/observing/RFI/Ka-Band.shtml

The problem on antenna 10 was fixed early October 2010, and I believe the
cause was a faulty X-band LNA (Dan and Chuck may elaborate on the details).
I am reporting this just in case the problem seen on ea22 has a similar
origin to what ea10 had some months ago.

em


On Thu, Feb 10, 2011 at 5:32 PM, Rick Perley <rperley at nrao.edu> wrote:

>    I got some time to look more closely at the 36280 MHz 'birdie'
> reported on yesterday.
>
>    It is only on antenna 22, in both RCP and LCP, but stronger in the
> former.  It is seen on all baselines between 22 and other antennas, but
> on no other baselines -- even those comprising adjacent antennas.  The
> strength of the 'line' is much stronger on short baselines to 22 --
> indicating that fringe winding is operating.
>
>    So this would presumably be an internal signal.
>
>
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