In the Spectrum View, you can monitor the signal to be located as well as it’s spectral environment during the DF process. This feature is useful to detect any RF frontend overload during the DF process. The SignalShark automatically detects any overload of the IF digitizer and displays an overload indicator. Furthermore, you can optimize your bearing settings like the CBW of the Bearing View to the signal of interest. The CBW of the Bearing View is visualized in the Spectrum View as a blue area around the center frequency. It should be wide enough to cover the signal of interest and narrow enough to filter out the adjacent signals. Additionally, if the CBW is much wider than the signal bandwidth, it will reduce the DF sensitivity.
The occupied bandwidth OBW and the center frequency Fcent of the signal under investigation can conveniently be measured with the SignalShark using the “occupied bandwidth” spectrum marker function. The OBW definition should be set to 99% of the total power. The optimum Ftune and CBW settings can of course also be estimated by visual inspection of the spectrum.
Figure: As a view within the Auto DF task, Fcent is coupled to Ftune of the Bearing view.
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A detailed description of the Spectrum view can be found at here.