Radio Regulations
Source: the Radio Regulations published by the International Telecommunication Union (ITU).
All IBR RecommendationsAs incorporated in RR-2020
This is not the text in force. It is the version of this Recommendation that RR-2020 gave treaty-binding force, kept so that the incorporated set can be read as it stood at each conference.
See the edition in force (RR-2024)Recommendation ITU-R P.525-4
Mandatory (1978-1982-1994-2016-2019)Calculation of free-space attenuation
Version history
Version evolutionThe 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.
Incorporated into the RR by
RR provisions, footnotes and Resolutions that incorporate this Recommendation
Footnote
Resolution
Bands and services are derived from the footnotes of the Radio Regulations as they stand, so they are shown only on the edition in force.
Scope
Recommendation ITU-R P.525 provides methods to calculate the attenuation in free space.
Keywords
Recommends
- that the methods in the Annex should be used for the calculation of attenuation in free space.
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.