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6.2.3  The DOCs associated with the frequency assignments for ATS Communications Facilities and Radio Navigation and Landing Aids at aerodromes, shall be published in the Remarks column of sections AD 2.18 and AD 2.19 of the AIP, respectively (2271).
Frequencies for En-route Navigation Facilities shall have their DOCs published in the AIP section ENR 4.1 under the associated Remarks column (2272).
NOTE:  Aircraft radio transmissions outside of the DOC are a known source of co-channel and adjacent channel interference.
6.2.4  Recommendation: The effective radiated power should be such to provide a minimum field strength of 45 dB . V/m within the radio service area for Air Traffic Services, or such a minimum field strength or minimum effective radiated power as may be specified by the ANO Approval (383).
[Based on ICAO Annex 10 Aeronautical Telecommunications Volume III § 2.2.1.2 Power and Volume V Attachment A § 2.4.]
Guidance: The ICAO Annex 10 Volume III § 2.2.1.2 recommendation specifies that 'On a high percentage of occasions, the effective radiated power should be such as to provide a field strength of at least 75 . V/m (-109 dBW/m2) within the defined operational coverage of the facility, on the basis of free space propagation.' This field strength has been assumed to be the median (50 percentile) value and to achieve the 'high percentage of occasions' has been adjusted to a 95 percentile value, considered appropriate for Air Traffic Services, by the use of an additional margin of 8dB based on CCIR (ITU) Recommendation 528-2 using the expression [20 log 75 dB V/m + 8
.
dB]. Further information may be found in reference [3].
6.3  WT Act Aeronautical Radio Licence
6.3.1  All Aeronautical Radio Stations shall be suitably licensed under the WT Act prior to any transmissions being made (384).
6.3.2  For new installations that operate on aeronautical frequency assignments, initial applications to establish an Aeronautical Radio Station shall be made to CAA Radio Licensing, which will trigger the process of issuing a WT Act aeronautical radio licence and ANO Approval for Air Traffic Services (385).
Guidance: The Civil Aviation Authority’s Directorate of Airspace Policy (DAP) has been appointed by OFCOM as its agent for WT Act aeronautical radio licences.
For established Aeronautical Radio Stations which have ANO Approval, WT Act aeronautical radio licence renewal will be arranged directly between DAP and the service provider.
NOTE:

OFCOM may be contacted at:
OFCOM Riverside House 2a Southwark Bridge Road London SE1 9HA
http://www.ofcom.org.uk
Failure to renew a WT Act aeronautical radio licence will invalidate the associated ANO Approval. If a Service Provider does not renew their WT Act aeronautical radio licence within a reasonable period of that licence becoming invalid, the associated frequency assignment will be withdrawn. Co-incident with the withdrawal of the frequency assignment the ANO Approval will be withdrawn. Renewal after the withdrawal of the ANO Approval will be treated as a new application, which may lead to delay and Service Provider expense in re-establishing an Aeronautical Radio Station.
NOTE:  All new Air Traffic Services Aeronautical Radio Stations must have been assessed under the Air Navigation Order Article 205 by the CAA SRG Air Traffic Standards Division before a WT Act aeronautical radio licence can be issued.
6.4  Inspection of Aeronautical Radio Stations
6.4.1  The equipment and systems at aeronautical radio stations, associated records and WT Act Aeronautical Radio Licence shall be made available for inspection by an authorised person, being a CAA SRG Inspector or an OFCOM Radio Investigation Service Officer (388).
Guidance: Demonstration of compliance with the terms and conditions of the ANO Approval and WT Act Aeronautical Radio Licence may be required. This may include measurements to verify transmitter frequency, modulation depth, transmitter output power and a determination of effective radiated power. The ATS Provider responsible for the operation of the Aeronautical Radio Station would normally be expected to provide calibrated measurement equipment for this purpose.
　
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