Embodiments of the invention are concerned with correction of quadrature errors associated with digital communications systems, and in particular in a wireless transmit chain in which an up-converter and a down-converter both have a direct conversion architecture. A plurality of threaded holes is defined in two sidewalls of the cabinet. The probe is formed of a sheet of a metal sheet which is bent multiple times, the metal sheet having a predetermined configuration in which a portion corresponding to the terminal portion, a portion corresponding to the spring portion, and a portion corresponding to the housing portion are continuously linked together. A web thus formed may be laminated with a metallic foil or metallized polymeric film.