Abstract
The spark-ignition circuit of the internal-combustion engine is the most widespread source of interference to short-wave radio and television services. This paper reviews the progress made in the measurement of the interference producing radiation and the development of remedial measures summarized in the relevant British Standards and Codes of Practice. The regulations for the control of ignition interference recently introduced by the Postmaster General are described and their implications discussed. The design, construction, and efficacy of suppression equipment, in particular suppression resistors for insertion in the high-tension part of the ignition circuit, are described in some detail.The possible effect of resistors on engine performance is discussed and the results of tests under controlled conditions indicating negligible effect are given.The results of extensive measurements of the magnitude of ignition interference on passenger cars and commercial vehicles are analysed and assessed in relatio...
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