Radiocommunication Study Group 4 WP 4A WP 4B WP 4C Satellite services Propagation of radio waves in ionized and non-ionized media and the characteristics of radio noise, for the purpose of improving radiocommunication systems. pdf#page=29&pagemode=noneITU-R Study Group booklet Structure Efficient orbit/spectrum utilization for FSS and BSS Working Party 4A (WP 4A) Systems, air interfaces, performance and availability objectives for FSS, BSS and MSS Working Party 4B (WP 4B) Efficient orbit/spectrum utilization for MSS and RDSS Working Party 4C (WP 4C) Mailing Lists, Rapporteur and Correspondence Groups of SG 4, WP 4A, WP 4B and WP 4C – How to use Disbanded Groups Next Meeting Next meeting to be announced… Registration SG G Meetings Sharepoint site Contributions Submission rsg4@itu.int Meeting Sessions Virtual meeting sessions SG 4 Webcast SG 4 Captioning All meetings (SG 1) Contributions Documents Contributions “as received” Contributions Contributions Template Summary Record (Meeting: 2023-07-07) Main Documents Administrative Documents (ADM) Information Documents (INFO) Temporary Documents (DT) Informal Documents on Sharepoint Circulars Circular Letters (LCCE) Administrative Circulars (CA) Administrative Circulars (CACE) Tools and Resources Documents Search Tool Study Group Sync Applications templates for the submission of digital data sets and computer programs Document Archives