RFI alert for Jan 2011
Fortunately, A2010 should not be affected by this GPS alert.
However, be sure to watch out for excess GPS activity during runs
Jan 30-31 and complain if there seems to be extraordinary GPS
activity.
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----- Forwarded message from Dan Mertely -----
Date: Fri, 21 Jan 2011 10:44:55 -0700
From: Dan Mertely
Reply-To: Dan Mertely
Subject: GPS-L3 (1381 MHz) RFI Alert
We have received advanced 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 detailed below.
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: GPS Satellite Testing Operations.
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20110127 1200 - 1900 Extended L3 tests, world-wide. => AST: 0800-1500 Jan27
20110128 1200 - 1900 Extended L3 tests, world-wide. => AST: 0800-1500 Jan28
20110129 2200 - 2400 Extended L3 tests, world-wide. => AST: 1800-2000 Jan29
20110130 0000 - 0100 Extended L3 tests, world-wide. => AST: 2000-2100 Jan29
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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
Last modified: Fri Jan 21 12:53:31 EST 2011
by martha