Very high-frequency radio-noise elimination

THE subject of radio-noise elimination on aircraft has always been a controversial one, even when the frequencies involved were relatively low. With the introduction of very high-frequency equipment the controversy has started afresh. The presence of radio noise in very high-frequency installations has caused observers to forget the principles learned in the work at medium frequency and high frequency, simply because the very high-frequency installation apparently did not follow the same rules that applied to the lower-frequency equipment. It is the purpose of this paper to outline generally the principles of radio-noise elimination at all frequencies, and show how these same principles apply specifically at very high frequency.