Radio Regulations

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

WRC Agenda Item › WRC-27 › AI 1.18
AI

1.18

WRC-27 · Agenda item 1.18

to consider, based on the results of ITU Radiocommunication Sector studies, possible regulatory measures regarding the protection of the Earth exploration-satellite service (passive) and the radio astronomy service in certain frequency bands above 76 GHz from unwanted emissions of active services, in accordance with Resolution 712 (WRC-23)

Current WP 7C WP 7D Res. 712 (WRC-23) ›

Shared frequency bands

View full cross-reference →

Bands this agenda item addresses jointly with other WRC-27 items (CPM Report Table 1). Click a band to open its spectrum page.

71–76 GHz
Also studied under: AI 1.10 AI 1.16
81–86 GHz
Also studied under: AI 1.10
114.25–116 GHz 130–134 GHz
Also studied under: AI 1.16
At a glance Summary & background Regulatory Studies

At a glance Beta

Governing resolution
Res. 712 (WRC-23)
Responsible group WP 7C, WP 7D
Agenda-item type Technical

What's being studied — points to watch

Unwanted-emission limits

The lever is limits on out-of-band and spurious emissions from active services — chiefly GSO and non-GSO space stations — not new restrictions on where they operate.

Windows fixed by nature

EESS (passive) sensors and radio astronomy observe at frequencies set by physics; shifting frequency to avoid interference is not possible (Res. 712).

Updating Res. 750 and Res. 739

The outcome would revise the existing protection resolutions — Res. 750 for EESS (passive), Res. 739 thresholds for radio astronomy — several of whose bands have no thresholds today.

Allocations stay as they are

No change is intended to Article 5 allocations or their status above 86 GHz, nor to the existing fixed-service provisions protecting 86–92 GHz (Res. 712).

Preparation timeline

  1. Dec 2023 WRC-23 agenda adopted
  2. Dec 2023 CPM 27-1 studies allocated
  3. ITU-R studies 2026
  4. ITU-R studies 2027
  5. 5–15 Apr 2027 CPM 27-2 final report
  6. RTO Prep meetings 2027
  7. 11–15 Oct 2027 RA-27
  8. 18 Oct–12 Nov 2027 WRC-27

Spotted an inaccuracy in this analysis? Please let us know via the contact form →

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.