Abstract: Universal waveguide joint, provided with at least two waveguide segments (1-7) slidable over each other, whereby one end of at least one of the waveguide segments (1-7) has a convex surface and the end of another respective waveguide segment, slidable over said convex surface, a concave surface.

Abstract: A pulse radar apparatus (2) for target (14) tracking is designed to provide angular error data representing the deviations of projectiles, fired from a gun (3) at the target with respect to the target position line. The l.f.-signal processor of said radar apparatus comprises:a. a signal analyzer (17) having a filter bank for determining Doppler spectral components of echo signals received from the fired projectiles within the target range gate (23) and l.f. detected;b. selection means (18) for selecting the projectile Doppler spectral components from the signal analyzer (17) and filter bank; andc. an angular error generator (24) for generating angular error data from the Doppler spectral components selected by the selection means (18) to correct gun aiming values calculated by a fire control computer (9).