General planning criteria Provisions concerning the deployment of VHF frequencies and the avoidance of harmful interference are contained in Annex 10, Volume V, Chapter 4, section 4.1.5. (Amendment 86) For the ease of reference, these provisions are reproduced in Appendix E. The latest amendments to Annex 10 should be consulted in case additional amendments were introduced. For co-frequency assignments the minimum geographical separation between facilities shall be such that the designated operational coverage of each facility is separated by a distance not less than: required to provide a D/U ratio of 20 dB; or the sum of the distance to the radio horizon of the designated operational coverage area of each facility. Alternatively, in areas where the frequency congestion is severe, a protection ratio of 14 dB can be used on the basis of a Regional air navigation agreement facilities using a common frequency do not require frequency protection between each other (e.g. Extended Range facilities) the distance to the radio horizon is calculated as shown in Chapter 1, paragraph 1.3.2 with the formula where = the distance of dRH the station to the radio horizon (NM) the height of the h transmitter = or receiver above the Earth’s surface (feet) the application of the minimum separation distance on the sum of the radio horizon distance of each facility assumes that it is highly unlikely that two aircraft will be at the closest points between and at the maximum altitude of the frequency protected service volume of each facility details on the calculation of separation distances are in paragraph 2.7. Paragraph 2.8 contains separation distances for the uniform designated operational coverage for aeronautical services as identified in paragraph 2.6. the separation distance is calculated for aircraft operating at the maximum range and maximum height of the designated operational coverage. in cases where broadcast services (VOLMET) are involved, the minimum geographical separation distance required to obtain a protection ratio D/U of 20 dB is established relative to the ground broadcast transmitter. For adjacent frequency assignments, the minimum geographical separation between facilities shall be such that points at the edge of the designated operational coverage of each facility are separated by a distance sufficient to ensure operations free from harmful interference. Notes: the edge of the designated operational coverage is at the maximum and maximum height. for facilities operating with 25 kHz or 8.33 kHz channel spacing, the adjacent channel separation of 10 NM has been established.
General planning criteria Provisions concerning the deployment of VHF frequencies and the avoidance of harmful interference are contained in Annex 10, Volume V, Chapter 4, section 4.1.5. (Amendment 86) For the ease of reference, these provisions are reproduced in Appendix E. The latest amendments to Annex 10 should be consulted in case additional amendments were introduced. For co-frequency assignments the minimum geographical separation between facilities shall be such that the designated operational coverage of each facility is separated by a distance not less than: required to provide a D/U ratio of 20 dB; or the sum of the distance to the radio horizon of the designated operational coverage area of each facility. Alternatively, in areas where the frequency congestion is severe, a protection ratio of 14 dB can be used on the basis of a Regional air navigation agreement facilities using a common frequency do not require frequency protection between each other (e.g. Extended Range facilities) the distance to the radio horizon is calculated as shown in Chapter 1, paragraph 1.3.2 with the formula where dRH = the distance of the station to the radio horizon (NM) h = the height of the transmitter or receiver above the Earth’s surface (feet) the application of the minimum separation distance on the sum of the radio horizon distance of each facility assumes that it is highly unlikely that two aircraft will be at the closest points between and at the maximum altitude of the frequency protected service volume of each facility details on the calculation of separation distances are in paragraph 2.7. Paragraph 2.8 contains separation distances for the uniform designated operational coverage for aeronautical services as identified in paragraph 2.6. the separation distance is calculated for aircraft operating at the maximum range and maximum height of the designated operational coverage. in cases where broadcast services (VOLMET) are involved, the minimum geographical separation distance required to obtain a protection ratio D/U of 20 dB is established relative to the ground broadcast transmitter. For adjacent frequency assignments, the minimum geographical separation between facilities shall be such that points at the edge of the designated operational coverage of each facility are separated by a distance sufficient to ensure operations free from harmful interference. Notes: the edge of the designated operational coverage is at the maximum and maximum height. for facilities operating with 25 kHz or 8.33 kHz channel spacing, the adjacent channel separation of 10 NM has been established.
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