# Commission Implementing Regulation (EU) No 1207/2011 of 22 November 2011 laying down requirements for the performance and the interoperability of surveillance for the single European sky (Text with EEA relevance), Article 6: Spectrum protection

Extent: E+W+S+N.I.

1. By 2 January 2020 at the latest the CAA shall ensure that a secondary surveillance radar transponder on board any aircraft flying over the United Kingdom is not subject to excessive interrogations that are transmitted by ground-based surveillance interrogators and which either elicit replies or whilst not eliciting a reply are of sufficient power to exceed the minimum threshold level of the receiver of the secondary surveillance radar transponder.
2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. By 2 January 2020 at the latest the CAA shall ensure that the use of a ground based transmitter operated in the United Kingdom does not produce harmful interference on other surveillance systems.
4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Source: https://www.legislation.gov.uk/eur/2011/1207/article/6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1207/article-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.