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Limiting Weather Radar Spurious Emissions – WG SE21

Limiting Weather Radar Spurious Emissions – WG SE21. Date: 2009-7-16. Authors:. Introduction. The ECC is preparing a Report on the Impact of Radar Spurious Emissions on Other Radiocommunication Services/Systems in WG SE21

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Limiting Weather Radar Spurious Emissions – WG SE21

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  1. Limiting Weather Radar Spurious Emissions – WG SE21 Date: 2009-7-16 Authors: Rich Kennedy, Research In Motion

  2. Introduction • The ECC is preparing a Report on the Impact of Radar Spurious Emissions on Other Radiocommunication Services/Systems in WG SE21 • Weather radars operating in the 5600 – 5650 MHz band are causing interference far beyond their licensed band • For 802.11a devices, weather radar emissions in-band will cause DFS to block channels 120 though 128 • Without limits many more channels are unusable Rich Kennedy, Research In Motion

  3. The Report • The intent is to set an out of band limit at -100dBc for fixed radars installed after January 1, 2006 • About 200 weather radars around Europe do not meet this • EUMETNET wants to set it at -60dBc • They claim very few complaints have been heard • They • There have been reports from Finland that these weather radars have interfered with radio links in the 6 GHz and 7 GHz bands • Adding BPFs (and LPFs for the harmonics) to the 250kW radars eliminated this interference • They estimated the cost of the modification to be ~$10,000 Rich Kennedy, Research In Motion

  4. The Problems • EUMETNET has been active in writing this document and has done its best to limit the impact on radar systems • The work on this document needs more inputs from the RLAN community to ensure that 802.11a devices are better protected from weather radar spurious emissions • The Wi-Fi Alliance will submit counters to EUMETNET efforts to water down the report • Should 802.18 do the same? • The next meeting of SE21 in August 27 - 28 Rich Kennedy, Research In Motion

  5. References • SE21(09)31 Annex7 - Working document on Radar spurious emission • (ETSI membership required) Rich Kennedy, Research In Motion

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