Vicon V235GLTA Passive Ground Loop Correction Transformer, single channel, for Vicoax. The V235GLTA Ground Loop Transformer is a passive ground loop correction device for coaxial control systems such as Vicoax®. It differentially nullifies the AC current that can occur in the video cable shield as a result of differing voltage potentials at each end of the shield. The difference in potential can arise from bridging of two power distribution systems supplying the camera and monitor in which the level of electrical ground varies. The result is the production of an AC current in the cable shield. The V235GLTA, designed specifically for a coaxial control system, protects and restores the video signal. Ground loops are a common cause of video distortion. Undesirable symptoms include “hum” which appears on one or more horizontal bars, horizontal tearing or pulling, and vertical rolling.