Abstract: This invention is a portable support apparatus comprising a mounting frame or yoke which can be supported about the hips of a worker or be attached to a machine or robot. A pivoting assembly pivots a rod having one end secured to the pivoting assembly to adjust the rod angle relative to the mounting yoke. A head assembly attachment means is secured to the rod at its other end, and is adjustable to a plurality of pitch angles relative to the rod to facilitate contact with the surface to be worked on. A head assembly is attached to the rod which may support a variety of material-removing devices including scrubbers, brushes, and scrapers, all of which can rotate circularly or eccentrically or vibrate to facilitate removal of material from surfaces. The head assembly also may include fluid projection nozzles, and vacuum apertures for connection to vacuum systems for removal of materials. The head assembly may also be adapted for use as a tool for the application of various substances on a surface.

Abstract: A radio frequency detector uses a Schottky barrier diode as the detection element. In order to protect this diode against damage caused by the application of excessive power, a NIP diode is connected in shunt with the Schottky barrier diode and is positioned very closely adjacent to it with the connecting leads being as short as possible. The NIP diode has a very low internal capacitance, which is compatible with the operation of the Schottky barrier diode as a radio frequency detector.