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Office of Executive Secretary Urbana, Illinois February 15, 1940 Editor 9 e Notes Every NAEB member should be interested in progress; therefore, should be interested in frequency modulation* The following article, prepared by Jim Ebel, Chief Engineer of WILL, is' presented here to whet your interest. FREQUENCY MODULATION By A. James Ebel, Chief Engineer, WILL Frequency modulation, is it just a grand pipe dream or is it the coming thing in radio broadcasting? That question is before the commission, the industry, and the general public today. Of more importance to us is, where does educational broadcasting fit in this picture? The answer to this and many other kindred questions is not at hand at the present time. It is one of those intangibles with which we will have to live for several years before anything of definite value will be known. Our purpose in presenting this discussion is to outline some of the established facts and then to raise certain questions which axe pertinent. No attempt will be made to discuss the technical operation of frequency modulation because the author is far from an expert on the subject. Rather, we have included a partial bibliography of frequency modulation which may be consulted for that information. First iet us review the advantages of the frequency modulation system. Probably the outstanding attribute of the system is the noise reduction. For wide band frequency modulation this can be shown to be 35 DB, Note that this is reduction and not elimination. Secondly, the system can transmit a wide range of audio frequencies without increasing the signal to noise ration. Thirdly, the system from transmitter input to discriminator output (i.e. seoond detector output) exhibits a greater dynamic range for the transmission of music. In the fourth place, due to the limiter action the interference ratio between stations is two to one Instead of 35 to 1, simplifying the allocation problems insofar as a single frequency is concerned. And, finally, wide band frequency modulation has a number of engineering niceties which must not be overlooked. All of the host