European Commission Decision 2008/447/EC of 13 June 2008 obliges EU member states:
"No later than six months after entry into force of this Decision Member States shall designate and subsequently make available, on a non-exclusive basis, the 2,500-2,690 MHz band for terrestrial systems capable of providing electronic ommunications services, in compliance with the parameters set out in the Annex to this Decision"
UK CAA informs in Air Traffic Services Information Notice 168, issued 10 November 2009 that the use of 2.6 GHz Band may result, if no suitable mitigations are in place, in radars that operate in the 2.7 - 3.4 GHz (S-Band) being adversely affected due to their susceptibility to authorised transmissions from within the 2.6 GHz Band. Tests and studies carried out over the last 18 months have confirmed such potential adverse effects.
Your Attention Is Required
Air Navigation Service Providers are invited to review the issue, investigate the relevance for their operational environment and, as appropriate, introduce appropriate mitigation mechanisms.
Aviation Authorities are invited to review the issue and investigate the relevance for their state.