RFI alert for Oct=-Nov 2011

The blocks are:
11.10.14   AST 09-19
11.10.25   AST 09-19
11.11.08   AST 10-20
11.11.17   AST 10-20

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.  No specific cause was released.

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)
------------------------------------------------------------
20111014     1300 - 2300   Intermittent L3 tests, world-wide.   ==>   AST 09-18

20111025     1300 - 2300   Intermittent L3 tests, world-wide.   ==>   AST 09-18

20111108     1400 - 2400   Intermittent L3 tests, world-wide.   ==>   AST 10-19

20111117     1400 - 2400   Intermittent L3 tests, world-wide.   ==>   AST 10-19
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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