RFI alert for Nov-Dec 2011

We have received advance notice from the US Space Command
(USSC), Colorado Springs, CO, informing the RA community of
upcoming, extended L3 test transmissions.  The observatories
should expect increased RFI @ 1381 MHz during the dates &
times indicated below.  These transmissions are part of their
normal, quarterly testing.

VLA & VLBA schedulers should attempt to schedule 1381 MHz use
around these times if possible.  Observing scientists should
be made aware of the increased possibility of corrupted data
on these dates and times.  VLA and VLBA operators should note
unusual L-band Tsys or total power fluctuations observed during
these times in the Operator Log forwarded to observers.

-Mert


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GPS-L3 ALERT SCHEDULE:
============================================================
SUBJECT:  Extended GPS Satellite Testing Operations.

FREQUENCY AFFECTED:    1381.05 ± 2.5 MHz

DATE (UTC)  TIME (UTC)    Comments
(YYYYMMDD)  (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20111129     1800 - 2400   Extended L3 tests, world-wide.
20111130     0000 - 0400   Extended L3 tests, world-wide.

20111130     1800 - 2400   Extended L3 tests, world-wide.
20111201     0000 - 0400   Extended L3 tests, world-wide.
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From the clear, high deserts of central New Mexico, The Land of
Enchantment, the VLA, and dark, dark, starry, starry nights ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Daniel J. Mertely
National Radio Astronomy Observatory
Interference Protection Office Engineer
P.O. Box o
Socorro,  NM  87801
(575) 835-7128
dmertely@nrao.edu

-Mert