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This series of transformers eliminates spurious voltages caused by the flow of undesired currents between the LO sides of the source and a remote load. They are particularly useful in video and data transmission systems where ground currents cause interference and picture quality problems. The transformers are supplied with input and output connectors insulated from ground and as well as each other. If your video, data or RF transmission is plagued by hum bars or other video problems, do what Broadcast, Telecommunications and CCTV Engineers have been doing successfully for over fifty years: Install North Hills’ Isolation Transformers! North Hills’ “Humstoppers” provide quick, cost-effective solutions to interference due to differences in ground potential or induced common-mode noise.