A New Field of Application for Ultra-Short Waves

In a previous issue of the Proceedings A. Esau and W. M. Hahnemann referred to the applications of ultra-short waves and to their being suitable for a precise bundling of radiation. In the meantime, other authors have discussed the same subject. The present paper describes the use of this kind of waves in connection with radio beacons. A new method of forming a guide ray by keying the reflectors is stated. The dependence of the guide ray upon size, spacing, and number of reflectors is measured. There is no distortion due to reflections. A description is given of the use of the radio range beacon for blind landing of airplanes in thick weather. Simultaneous visual and aural reception in the airplane is possible without changing the method of keying the transmitter.