Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current issue updates recommendations 2.4.17A, 2.4.22A, and 2.4.22B and adds new recommendation 3.1.7.

This document issue was superseded by CCSDS 401.0-B-31, Radio Frequency and Modulation Systems—Part 1: Earth Stations and Spacecraft (Blue Book, Issue 31), released February 2021.