| Show Up Wic iene 0 nerve e 0 Science Service WU Service Senko New Nev Radio Gets Two Signals on Same SauIe Frequency Gives Aviators Weather and Direction at at Once PITTSBURGH New New ra radio io aid for commercial aviation is under test here which consists of the transmission of both voice and radio range signals on the same frequency The two sets of signals are received simultaneously In an nn airplane di di directional signals operating a needle pointer on the Instrument panel and wd the voice signals being received In headphones The new development de solves the problem existing for some time that directional beacon signals and I Ithe the weather reports went out on the tiie same seine radio frequency and thus one had to be interrupted for the other Needs Required Interruptions The limited number of frequency channels available and the need for forthe forthe forthe the simplest possible receiving equipment required such Interrupted Interrupt Interrupt- ed service In the past With both hoth weather and range directions on the thc same frequency the pilot did not need to change chane dial settings on his receiver vcr The old system while simple had its handicaps If a pilot was lying flying Ing blind and attempting to to locate an I airport It was disconcerting to have havethe havethe the directional signals Interrupted by a n weather broadcast which told him It was raining or foggy in his vicinity lie knew that anyway otherwise other he would not be fi flying blind Weather Signals Delayed Landing In a minor aspect the weather sl signals dela delayed ed his landing and In Ina Ina ina a major case ml might ht delay him at nt a time when the ceiling at the the- theair aIrport airport airport air aIr- port was lowering to zero-zero zero conditIons con con- Before the new development the bureau of air commerce sometimes postponed weather Information for fora a short while and kept the directional directional sl signals nals on the air continuously continuously when requested by pilots This s system stem also had Its handicaps handicaps handi handi- caps for weather welther reports might be needed by other pilots and planes with receivers but no transmitting equipment might need continuous directional sl signals and not be able to request them The new development of ot receiving receiving In ing two signals on the same frequency frequency frequency fre fre- quency solves a all 1 these problems |
