RECOMMENDATION ITU-R S.1554 - Methodology for determining the overall accuracy of epfd ... ANNEX 1 - Methodology for determining the overall accuracy of epfd( measurements 1 Introduction 2 Measurement procedure realization using a DSP, spectrum analyser or power meter 3 Calibration of the CSM RF path 4 Accuracy of the interference and noise measurements at the affected earth station 5 Error budget for total measurement procedure 6 Summary