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This paper discusses certain known characteristics and sources of radio interference and methods used to reduce the interference levels present in business machines. Particular attention is given to electro-mechanical machines ranging from a simple card perforator, operated by an electrical contact and an electromagnet, to electronic data-processing machines. The sources of interference in these machines are found in a wide variety of components and circuit configurations, such as electrical contacts, gas tubes, unterminated transmission lines and motors.
Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.