GPS alert for Aug, Sept and Dec 2014
Not a problem for us at this point...
RFI alert for Nov and Dec 2014
This is an update on the previous
alert issued earlier this fall.
The UAT is scheduled to observe Nov 23-29 and hence should not be impacted
by this alert.
THERE IS A NEW UPDATE FOR THE DEC 2014 PERIOD; DOES NOT AFFECT US
-------- Original Message --------
Subject: GPS-L3 (1381 MHz) RFI Alert Update
Date: 2014-11-18 18:10
From: Dan Mertely
The US Space Command has updated to the following schedule for the
LAZAP/RZAP tests of their new GPS satellite. The space vehicle
(GPS IIF-8, SV69) is scheduled for launch 20141029. They will take
precautions to limit the L3 transmissions of other satellites during
the test.
(These extended-duration tests are in addition to the regular, daily
short-duration (< 180 sec/day) GPS-L3 tests allowed for in the USAF/
NSF MOU.)
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.
Please forward any conflicts with your schedules to me and I will
work with them on reducing the impact, if possible.
-Mert
============================================================
GPS-L3 ALERT SCHEDULE:
============================================================
SUBJECT: GPS 2F-8 SV on-orbit tests (preliminary schedule).
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz (intermittent)
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20141213 2000 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141214 0000 - 0600 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141214 2000 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141215 0000 - 0600 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141215 2000 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141216 0000 - 0600 GPS 2F-8 on-orbit ck, Primary, CONUS.
------------------------------------------------------------
Look-ahead for the rest of 2014 (Preliminary):
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20141202 1900 - 2400 Quarterly L3 tests, Primary, CONUS.
20141203 0000 - 0500 Quarterly L3 tests, Primary, CONUS.
20141203 1900 - 2400 Quarterly L3 tests, Back-up, CONUS.
20141204 0000 - 0500 Quarterly L3 tests, Back-up, CONUS.
20141204 1900 - 2400 Quarterly L3 tests, Back-up, CONUS.
20141205 0000 - 0500 Quarterly L3 tests, Back-up, CONUS.
Previous message
-------- Original Message --------
Subject: GPS-L3 (1381 MHz) RFI Alert
Date: 2014-10-21 13:50
From: Dan Mertely
The US Space Command has released the following schedule for the
LAZAP/RZAP tests of their new GPS satellite. The space vehicle
(GPS IIF-8, SV69) is scheduled for launch 20141029. They will take
precautions to limit the L3 transmissions of other satellites during
the test.
Please forward any conflicts with your schedules to me and I will
work with them on reducing the impact, if possible.
(These extended-duration tests are in addition to the regular, daily
short-duration (< 180 sec/day) GPS-L3 tests allowed for in the USAF/
NSF MOU.)
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.
Please contact me for coordination should any of these dates and times
conflict with planned radio astronomy observations.
-Mert
============================================================
GPS-L3 ALERT SCHEDULE:
============================================================
SUBJECT: GPS 2F-8 SV on-orbit tests (preliminary schedule).
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz (intermittent)
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20141119 1500 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141120 0000 - 0300 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141120 1500 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141121 0000 - 0300 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141121 1500 - 2400 GPS 2F-8 on-orbit ck, Primary, CONUS.
20141122 0000 - 0300 GPS 2F-8 on-orbit ck, Primary, CONUS.
------------------------------------------------------------
Look-ahead for the rest of 2014 (Preliminary):
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20141202 1800 - 2400 Quarterly L3 tests, Primary, CONUS+.
20141203 0000 - 0400 Quarterly L3 tests, Primary, CONUS+.
20141203 1800 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20141204 0000 - 0400 Quarterly L3 tests, Back-up, CONUS+.
20141204 1800 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20141205 0000 - 0400 Quarterly L3 tests, Back-up, CONUS+.
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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
NRAO-RFI@nrao.edu
-Mert
This is not a problem for us. What about others?
Last modified: Tue Oct 21 14:54:29 EDT 2014
by martha
