This Recommendation provides radio-frequency (RF) channel arrangements for fixed wireless systems (FWSs) operating in the 4 GHz frequency range (3 400-4 200 MHz)@ which may be used for low@ mediumand high-capacity systems. The main text presents a homogeneous pattern of 10 MHz slots@ with which specific arrangements for channels multiple of the slots can be designed. Annex 1 presents a number of RF arrangements with channel separation of 30@ 40 and 80 MHz@ designed in this frequency band@ according to the recommended 10 MHz pattern.