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The highest and lowest tone of the signal is selected with the right and left cursor. The precision of the center frequency is very important and directly influences the performance of the decoder.
After every change, the center frequency and shift are automatically updated.
Another tuning cursor group with 8 (green) cursors helps to measure the center, bandwidth and the distance between multiple carriers in a more convenient way. The 8 cursors can be moved freely. This feature is helpful when measuring signals with non-equal carrier distance (as CHINESE 4+4 signal).
These options can be set using the right mouse button or the context menu (see FFT/Sonagram Context Menu). It is possible to remove the tuning FFT or Sonagram in the View Menu.