In the SCAN / Search toolbar the operator defines the parameters for scanning; then he starts the frequency scan either via the Scan button in the toolbar or via the function key Shift+F4. The spectrum of the selected frequency range is displayed in the RF spectrum area. The operator obtains an overview of the signal activities in the selected frequency range. In order to detect interesting signals it is possible to zoom into the frequency range in several steps. Besides this, the operator may examine the RF-waterfall. An interesting frequency may be marked with the frequency marker of the RF-spectrum display. After the operator stops scanning, the device remains on the selected frequency and the operator may listen to the audio of this signal.