CCSDS 401.0-B-22-2013 Radio Frequency and Modulation Systems - Part 1: Earth Stations and Spacecraft has been changed from CCSDS 401.0-B-21-2011 Radio frequency and modulation systems - Part 1: Earth stations and spacecraft.
CCSDS 401.0-B-22-2013 Radio Frequency and Modulation Systems - Part 1: Earth Stations and Spacecraft has been changed from CCSDS 401.0-B-21 Technical Corrigendum 1-2012 Radio frequency and modulation systems - Part 1: Earth stations and spacecraft; Technical Corrigendum 1.
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