RFI alert Sep 2009
Note: AST = UTC-4
According to the current A2010 schedule, we will not be impacted
by this alert in August or Sep2009 but we note the announced tests
scheduled for early December. See below.
From: Dan Mertely
Organization: NRAO
Date: Fri, 31 Jul 2009 12:24:01 -0600
To: vlaops@nrao.edu, vlbaops@nrao.edu, bclark@aoc.nrao.edu,
NRAO-RFI@nrao.edu, tgergely@nsf.gov, koneil@nrao.edu, rfiwatch@nrao.edu,
bob.sault@csiro.au, jsarkiss@atnf.csiro.au, rjc@jb.man.ac.uk,
rvermeulen@astron.nl, millenaar@astron.nl, alexe@astron.nl,
Tasso.Tzioumis@atnf.csiro.au, wsizemore@nrao.edu, cbeaudet@nrao.edu,
blewis@naic.edu, pwoody@nrao.edu, mdavis@seti.org, "Harvey Liszt (E-mail)
(E-mail)" , aclegg@nsf.gov, jromney@nrao.edu,
rfreund@as.arizona.edu, demerson@nrao.edu, aeer@haystack.mit.edu,
blitz@berkeley.edu, jwrobel@aoc.nrao.edu, gps-alerts@hcro.org, atac@hcro.org
Subject: New GPS L3 RFI Alert
We have been pre-alerted to the following, military GPS-L3 test
Transmissions which may cause RFI to observations scheduled for the
use of L-band (21cm) on the UTC date(s) and time(s) listed below.
These intermittent transmissions were previously unscheduled.
The 1381 MHz frequency is within the VLA L-band 21/20cm "LL"/"21",
"L1", and "L2", continuum default frequencies, and any L-band
spectral line set-up that includes 1381.05 ± 2.5 MHz.
VLA & VLBA schedulers should attempt to schedule 1381 MHz use around
these times if possible.
-Mert
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======================================================================
NEW 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)
----------------------------------------------------------------------
20090804 1430 - 1930 Intermittent system-wide tests.
======================================================================
In addition, radio astronomy schedulers should remain aware of the
following, previously distributed quarterly RZAPS/LZAPS schedules:
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======================================================================
PREVIOUSLY ANNOUNCED QUARTERLY RZAP/LZAP SCHEDULE:
SUBJECT: 3Q 2009 GPS Satellite Testing Operations.
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
----------------------------------------------------------------------
20090915 1900 - 2400 RZAP/LZAP system-wide tests (Primary).
20090916 0000 - 0300 RZAP/LZAP system-wide tests (Primary).
20090916 1900 - 2400 RZAP/LZAP system-wide tests (Back-up).
20090917 0000 - 0300 RZAP/LZAP system-wide tests (Back-up).
20090917 1900 - 2400 RZAP/LZAP system-wide tests (Back-up).
20090918 0000 - 0300 RZAP/LZAP system-wide tests (Back-up).
======================================================================
SUBJECT: 4Q 2009 GPS Satellite Testing Operations.
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
----------------------------------------------------------------------
20091201 2000 - 2400 RZAP/LZAP system-wide tests (Primary).
20091202 0000 - 0500 RZAP/LZAP system-wide tests (Primary).
20091202 2000 - 2400 RZAP/LZAP system-wide tests (Back-up).
20091203 0000 - 0500 RZAP/LZAP system-wide tests (Back-up).
20091203 2000 - 2400 RZAP/LZAP system-wide tests (Back-up).
20091204 0000 - 0500 RZAP/LZAP system-wide tests (Back-up).
======================================================================
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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
(505) 835-7128
dmertely@nrao.edu
Old RFI alerts
Last modified: Mon Aug 17 09:01:32 EDT 2009
by martha