RFI alert for May, June, Sep, Dec 2014
This is an update to the released alert
with schedule change for the June 2014 dates.
We have time on the evening of June 12, but should be ok.
We will have to check later when we know about possible fall LBW time.
Subject: Re: GPS-L3 (1381 MHz) RFI Alert: ***Schedule change***
Date: 2014-05-07 15:00
From: Dan Mertely
We have received updated notice from the US Space Command (USSC),
Colorado Springs, CO, informing the RA community of a change
in the schedule for the June, 2014 on-orbit checkout of SV67
(GPS 2F-6). It appears that their test date has been pulled-up
by 1 day. The observatories should expect increased RFI @ 1381
MHz during the dates & times indicated below. The GPS 2F-6 launch
is currently scheduled for 20140515.
(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 Quarterly LAZAP/RZAP tests.
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20140520 2100 - 2400 Quarterly L3 tests, Primary, CONUS+.
20140521 0000 - 0500 Quarterly L3 tests, Primary, CONUS+.
20140521 2100 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20140522 0000 - 0500 Quarterly L3 tests, Back-up, CONUS+.
20140522 2100 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20140523 0000 - 0500 Quarterly L3 tests, Back-up, CONUS+.
------------------------------------------------------------
SUBJECT: GPS 2F-6 SV on-orbit tests (preliminary schedule).
<<<<<<< SCHEDULE CHANGE >>>>>>>
FREQUENCY AFFECTED: 1381.05 ± 2.5 MHz (intermittent)
DATE (UTC) TIME (UTC) Comments
(YYYYMMDD) (HHMM)-(HHMM) (TEXT)
------------------------------------------------------------
20140609 1800 - 2400 GPS 2F-6 on-orbit ck, Primary, CONUS.
20140610 0000 - 0600 GPS 2F-6 on-orbit ck, Primary, CONUS.
20140610 1800 - 2400 GPS 2F-6 on-orbit ck, Primary, CONUS.
20140611 0000 - 0600 GPS 2F-6 on-orbit ck, Primary, CONUS.
20140611 1800 - 2400 GPS 2F-6 on-orbit ck, Back-up, CONUS.
20140612 0000 - 0600 GPS 2F-6 on-orbit ck, Back-up, 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)
------------------------------------------------------------
20140909 2000 - 2400 Quarterly L3 tests, Primary, CONUS+.
20140910 0000 - 0400 Quarterly L3 tests, Primary, CONUS+.
20140910 2000 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20140911 0000 - 0400 Quarterly L3 tests, Back-up, CONUS+.
20140911 2000 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20140912 0000 - 0400 Quarterly L3 tests, Back-up, CONUS+.
------------------------------------------------------------
20141202 2000 - 2400 Quarterly L3 tests, Primary, CONUS+.
20141203 0000 - 0400 Quarterly L3 tests, Primary, CONUS+.
20141203 2000 - 2400 Quarterly L3 tests, Back-up, CONUS+.
20141204 0000 - 0400 Quarterly L3 tests, Back-up, CONUS+.
20141204 2000 - 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
-Mert
Last modified: Mon May 12 13:20:17 EDT 2014
by martha