RFI alert December 2009
Note: AST = UTC-4
Note the GPS alert for December 2009
We do not yet know the December A2010 schedule but this alert was issued
in August 2009.
UTC interval AST interval
20091201 2000 - 2400 1600 - 2000 RZAP/LZAP system-wide tests (Primary).
20091202 0000 - 0500 2000 - 0100 RZAP/LZAP system-wide tests (Primary).
20091202 2000 - 2400 1600 - 2000 RZAP/LZAP system-wide tests (Back-up).
20091203 0000 - 0500 2000 - 0100 RZAP/LZAP system-wide tests (Back-up).
20091203 2000 - 2400 1600 - 2000 RZAP/LZAP system-wide tests (Back-up).
20091204 0000 - 0500 2000 - 0100 RZAP/LZAP system-wide tests (Back-up).
A2010 may be seriously impacted on these nights. So much for "coordination".
Please make notes in the log files when/if you notice GPS on these nights.
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 09:01:06 EDT 2009
by martha