avoid this problem is known as lobe on receive only (LORO), which uses one set of antenna elements to send a non-lobe-switched signal, and two additional sets for lobe switching on reception. Operation is basically identical to a normal lobing radar, but it denies any information about the lobing to the target aircraft, for the cost of some additional antenna elements (or more commonly, a second antenna). Unsynchronized "blocks" of signal can be used to jam LORO radars, although it is not as effective as against a normal lobing system and generally makes the operator's job more difficult, as opposed to impossible. The SCR-268, the US Army's first radar system, was one of the first radar sets to use lobe switching of its receiving antennas as a means to aim anti-aircraft searchlight beams at aircraft. References External links This lobe switching concept was used in the so-called Flimmerschalter in the German Lichtenstein radar during World War II. (see Radar tutorial) Radar