Labels:barrier reef | crt screen | earth | monitor | road | sky | windowpane OCR: dBm0 1 20 40 50 3550 3750 410.0 4250 Associated channel CCITT 46291 Adjacent channet Note The frequency of the virtual carrier of the associatcdl specch channct the origin O}t the frcquency scale (zero frequency }. FIGURE 6/0.414 Protection of the signalling channel at the sending end 3900 4100 frequcncy associatcd channci scalo
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