Abstract: A wireless communication device for packet communication is provided. Based on an interfering wave level that is stored in carrier sense table, the number of empty slots for every threshold of interfering wave is obtained, and, in a case where the number of empty slots for the threshold exceeds a predetermined value, a slave station is notified the number of empty slots.

Abstract: A wireless communication device for packet communication is provided. Based on an interfering wave level that is stored in carrier sense table, the number of empty slots for every threshold of interfering wave is obtained, and, in a case where the number of empty slots for the threshold exceeds a predetermined value, a slave station is notified the number of empty slots.

Abstract: In a spread spectrum communication apparatus, frame synchronization is established by inserting data for frame synchronization as a part of a synchronization word of a transmission frame on a sending side and detecting the data for frame synchronization from reproduction data of a reception frame on a receiving side. A frame synchronization pseudo-noise train generator section generates a pseudo-noise train for frame synchronization used as the frame synchronization data. A frame synchronization correlator section receives the pseudo noise train for frame synchronization and reproduction data to output a signal when the value of correlation of the pseudo noise train for frame synchronization and the reproduction data is not smaller than a reference value. A reception frame timing generator section outputs a reception synchronization word timing signal with the output signal of the frame synchronization correlator section being taken as a reference.

Abstract: A sighting device completely devoid of any lenses for use in pistol target shooting has a one-piece elongated outer tube having at least one saddle integrally formed on the outer tube and located proximal to one of the ends of said main tube. The saddle has two holes in it passing through the saddle into the interior of the main tube which provide access into the interior of the main tube. The holes are placed on the saddle 90 degrees apart from each other. Located on the saddle over each of the holes is a turret member. A portion of each of the turret members passes through each of the holes into the interior of the main tube. Mounted within the interior of the main tube is at least one elongated inner tube. The inner tube is pivotally mounted within the main tube such that one of its ends is free to move within the interior of the main tube.