Measurement and suppression of VHF radio interference caused by motorcycles and motor cars

The problem of ignition interference and its reduction has been emphasized in Europe, due to the simultaneous growth in both the number of motor vehicles, and in the number of FM and TV receivers. The paper reports the results of a large number of interference measurements made on automobiles and motorcycles. The data include the effects of various suppression schemes. As a result of these measurements, and taking into account existing European standards, a draft of an international standard was prepared for submittal to CISPR. This proposed standard covers both methods of measurement and limits.