Abstract: An intrusion alarm system is described which includes multiple-input intruder sensing circuits, the outputs of which are fed via separate logic NAND circuits, to bistable latch circuits which then supply signals to an alarm latch circuit. One of the bistable latch circuits is coupled to the alarm latch via an entry delay timer, and all latches incorporate noise suppression circuitry. The intrusion system has a remote arming and resetting circuit which provides automatic testing of on-board status monitor lamps. This intrusion system is interconnected to an adjust fire/emergency sensing and control unit.

Abstract: A balun block for microwave and higher frequencies comprising, in one embodiment, a microstrip balun having a planar dielectric member, a ground plane of conductive material centrally positioned within said member and conducting means passing around said member in space relationship to said plane comprising means to receive an incoming guided energy wave and to split said incoming wave into two components of equal or unequal phase depending upon the state of balance of the incoming wave and means to conduct and recombine said components in predetermined phase relationships into an outgoing guided energy wave. A second embodiment comprises a stripline balun.