. QST . Dimensions: (4682») 1V ^ N / \ V t 1 A. rf ^ / ^ - _ — 1 1 f > i ^ •v t \ / \ / V \ X > y A k / / \ \ > \ \ / / \ \ AIRCRAFTFILTERS UTC has produced the buti( of filterused in aircraft equipment for ov<a decade. The curve at the left ithat of a miniaturized (1020 cyclerange filter providing high attenution between voice and range friquencies. Curves at the right are that of onminiaturized 90 and 150 cycle filterfor glide path A =e4e== 50 C 55 75 5KC 6 •■00-•0 •JO y / / y y y /■ A / y / > y / y y y / y / 1 1 _

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915