https://tmfassociates.com/blog/2011/06/21/juggling-spectrum-continued/ Satellites, spectrum and other stuff Tue, 03 Feb 2026 21:36:32 +0000 hourly 1 http://wordpress.org/?v=3.3.1 https://tmfassociates.com/blog/2011/06/21/juggling-spectrum-continued/comment-page-1/#comment-570 krbarker Tue, 21 Jun 2011 20:20:35 +0000 http://tmfassociates.com/blog/?p=2091#comment-570 We've done a quick examination of the interference created by the GPS receivers due to LightSquared carriers (indirectly caused by distrition of the LightSquared carriers within the GPS receivers, NOT directly by the presence of LightSquared), and esimate that the new frequency plan will significantly reduce the impact of LightSquared on GPS receivers (see http://www.questinygroup.com/qgi-blog). That does not mitigate the GMDSS and Aero issues mentioned above, but basically what LS now claims is true. This is, as many of us predicted, an admission that their Phase 2 frequency plan was untennable for the GPS community. God love LightSquared! They have provided some of the most interesting discussions for wireless engineers in years! We’ve done a quick examination of the interference created by the GPS receivers due to LightSquared carriers (indirectly caused by distrition of the LightSquared carriers within the GPS receivers, NOT directly by the presence of LightSquared), and esimate that the new frequency plan will significantly reduce the impact of LightSquared on GPS receivers (see http://www.questinygroup.com/qgi-blog). That does not mitigate the GMDSS and Aero issues mentioned above, but basically what LS now claims is true. This is, as many of us predicted, an admission that their Phase 2 frequency plan was untennable for the GPS community.
God love LightSquared! They have provided some of the most interesting discussions for wireless engineers in years!

]]> https://tmfassociates.com/blog/2011/06/21/juggling-spectrum-continued/comment-page-1/#comment-569 Clive Packer Tue, 21 Jun 2011 17:44:03 +0000 http://tmfassociates.com/blog/?p=2091#comment-569 Inmarsat-C terminals are frequency agile over 1530 to 1545 MHz / 1626.5 to 1645.5 MHz so there may be some scope for moving C service closer to 1545 MHz. When I was at Inmarsat in 1994 we moved Inmarsat-C frequencies in order to accommodate the then TMI Communications launch of MSAT services. Inmarsat-C terminals are frequency agile over 1530 to 1545 MHz / 1626.5 to 1645.5 MHz so there may be some scope for moving C service closer to 1545 MHz. When I was at Inmarsat in 1994 we moved Inmarsat-C frequencies in order to accommodate the then TMI Communications launch of MSAT services.

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