The FFT Window is identical to the classifier FFT Window (see the section Classifier).
When the CCC is launched from the VHF/UHF-DIR menu, the frequency range displayed in the FFT window spans the selected classification bandwidth around the currently set translation frequency. When the CCC is launched from the VHF/UHF-SUB menu, the frequency range displayed in the FFT window spans the selected classification bandwidth starting from the currently set translation frequency.