Radio Regulations

Source: the Radio Regulations published by the International Telecommunication Union (ITU).

All IBR Recommendations
RA

Recommendation ITU-R RA.1631-0

Mandatory (2003)

Reference radio astronomy antenna pattern to be used for compatibility analyses between non-GSO systems and radio astronomy service stations based on the epfd concept

View official text at ITU

Version history

Version evolution

The number in each cell (e.g. −9) is the Recommendation's revision number — the “-9” in ITU-R M.585-9, not a negative value. So −8 → −9 means the binding reference moved from the 8th to the 9th revision.

RR-2008 -0
RR-2012 -0
RR-2016 -0
RR-2020 -0
RR-2024 -0

Incorporated into the RR by

RR provisions, footnotes and Resolutions that incorporate this Recommendation

Footnote

5.208B 5.372 5.443B 5.551H

Resolution

Resolution 739 (Rev.WRC-19) Resolution 741 (Rev.WRC-15)

Appendix

Appendix 4

Where it applies

Frequency bands and radio services this Recommendation reaches, derived from the RR footnotes that incorporate it.

Radio services

AERONAUTICAL MOBILE (2°) AERONAUTICAL MOBILE-SATELLITE AERONAUTICAL RADIONAVIGATION BROADCASTING BROADCASTING-SATELLITE EARTH EXPLORATION-SATELLITE (2°) FIXED FIXED-SATELLITE LAND MOBILE MARITIME MOBILE (2°) MARITIME MOBILE-SATELLITE METEOROLOGICAL AIDS METEOROLOGICAL-SATELLITE MOBILE MOBILE-SATELLITE RADIO ASTRONOMY RADIODETERMINATION-SATELLITE RADIONAVIGATION-SATELLITE SPACE OPERATION SPACE RESEARCH

Frequency bands

ITU RR table: 75.2-137.175 MHz ITU RR table: 137.175-148 MHz ITU RR table: 156.8375-161.9375 MHz ITU RR table: 335.4-410 MHz ITU RR table: 1 300-1 525 MHz ITU RR table: 1 525-1 610 MHz ITU RR table: 1 610-1 660 MHz ITU RR table: 2 520-2 700 MHz ITU RR table: 4 800-5 250 MHz ITU RR table: 18.4-22 GHz ITU RR table: 40-47.5 GHz

Scope

there is a need to determine the levels of interference which may occur at typical observatory sites, due to various sources of interference;

Recommends

  1. that, in the absence of particular information concerning the radiation pattern of the radio astronomy antenna involved, the mathematical model of the average radiation pattern as stated below should be used for compatibility analyses between non-GSO systems and RAS stations for frequencies above 150 MHz:
  2. G(ϕ) = Gmax – 2.5 × 10–3 Dλϕ2 dBi for 0 < ϕ < ϕm
  3. G(ϕ) = G1 for ϕm ≤ ϕ < ϕr
  4. G(ϕ) = 29 – 25 log ϕ dBi for ϕr ≤ ϕ < 10°
  5. G(ϕ) = 34 – 30 log ϕ dBi for 10° ≤ ϕ < 34.1°
  6. G(ϕ) = –12 dBi for 34.1° ≤ ϕ < 80°

+38 more in the full text

Source: ITU Radio Regulations, editions of 2008, 2012, 2016, 2020 and 2024. The English, French and Spanish texts are each taken from the official edition in that language, not translated from one another. Sources and citation.