WITH the introduction of airborne wireless equipment it became apparent, even with the low frequency and voltage ignition systems which were then used, that the prevention of radio interference caused by the ignition impulses presented a problem of considerable proportions. As engine development was pursued it was observed that the use of higher ignition voltages and frequency resulted in more efficient combustion; today high voltage and frequency ignition systems involving the use of oscillatory circuits are a common feature in piston‐engined aircraft.
Comber, M.M. (1948), "Recent Advances in Aircraft Ignition Systems: The Possibilities of a Low‐Voltage Ultra‐High Frequency Installation to Avoid Radio Interference", Aircraft Engineering and Aerospace Technology, Vol. 20 No. 9, pp. 282-282. https://doi.org/10.1108/eb031669
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