UHF-Satcom.com - L-Band monitoring (13/03/2010 21:29:08 -0000)

All of the waterfall / spectrum analysis images on this page were made with the RF-Space SDR-14 software defined receiver. Images are copyright UHF-Satcom.com and may not be copied / reproduced without permission.

Inmarsat 3-F2 15.5W Transponder spectrum analysis 31/12/2007 (Before Inmarsat-A was turned off)

Inmarsat 3-F2 15.5W Transponder spectrum analysis 02/01/2008 (After Inmarsat-A was turned off)

Inmarsat 3-F2 15.5W Transponder waterfall plot 02/01/2008

Inmarsat 3-F2 15.5W Transponder waterfall plot 05/01/2009

Inmarsat 3-F5 25.0E Transponder waterfall / spectrum analysis plot 02/01/2008

Inmarsat 3-F5 25.0E Transponder waterfall / spectrum analysis plot 05/01/2009

Inmarsat 4-F2 54.0W Transponder waterfall plot 02/01/2008

Inmarsat 4-F2 54.0W Transponder waterfall plot 05/01/2009

Inmarsat 3-F4 54.0W Transponder waterfall plot 07/01/2009 - note: BGAN services are no longer TX'd from this slot

The following information was received about the satellite repositioning;

TO     :  ALL MOBILE EARTH STATIONS

SUBJECT:  

On Wednesday, 7 January, starting at 08:00 UTC, there will be a
brief service outage of about one hour in the Atlantic Ocean
Region West (AOR-W) while Inmarsat transfers non-broadband services
from the Inmarsat-4 F2 to the Inmarsat-3 F4 satellite. The transfer
of services is taking place as part of the network optimisation
programme being carried out by Inmarsat to prepare for the
introduction of global Inmarsat-4 (I-4) coverage. The one hour
outage will affect all non-broadband services - including Inmarsat C
and Mini C, Inmarsat B, Fleet 33, 55 and 77, GAN, Mini M, Swift 64
and Classic Aero. After the transfer, all users in the AOR-W will
need to ensure that their Mobile Earth Station (MES) acquires the
new satellite correctly. Some MES terminals may find the new
satellite automatically. For the non-automatic cases it will be
necessary for the terminal operator to initiate a manual
re-acquisition, as per the instructions in their MES operator's
manual. Also, users of Inmarsat-3 (I-3) spot beam services in the
AOR-W - namely Fleet, Mini M, Swift 64, Aero I and Aero Mini M 
will experience a small reduction in the geographic area covered by
the I-3 satellite's spot beams.  However, Inmarsat will make best
commercial efforts to increase the I-3 spot beam coverage so that it
exceeds the original I-3 coverage. Users operating in other Inmarsat
Ocean Regions will NOT be affected by this transfer and will NOT
need to take any action at the above date and time. More
information about the repositioning, including coverage maps, can
be found on the Inmarsat website under Support, or from your
Inmarsat service provider.
Website support: http://www.inmarsat.com/coverage

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