The wide selection of DF antennas available in the ADD family allows tailor-made adaptation of Digital Scanning Direction Finders DDF0xS [1] and Digital Monitoring Direction Finders DDF0xM [2] to any task [3]. These antennas cover the frequency range 0.3 to 3000 MHz and, depending on the type chosen, enable operation as a correlative interferometer or by the Watson-Watt principle (FIG 1).
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