Radio broadcast .. (1922-30)

588 RADIO BROADCAST ADVERTISER 4RBORPHONE oAnnounces A NEW AND IMPROVED MODEL featuring Two Dial Control AND Rare Cabinet Beauty Add $5.00 in Rocky Mt. and Pacific Coast States Amazing value features the new ARBORPHONE 5-Tube Receiver. In appearance and in performance the ARBORPHONE matches, yes excels, point by point, sets listing for more than twice its price. Your first impression — usually the best — is rare beauty of cabinet design and finish. The expensive rounded front is exclusive with ARBORPHONE. The new model boasts many refinements of the same proved ARBORPHONE circuit now being used by thousands of satisfied owners. Simplified tuning made possible by special dual condensers and a separate radio frequency control brings improved reception on low wave lengths and greater volume on long wave length stations. DEALERS— A tremendous market awaits ARBORPHONE Franchised Dealers. Our discounts are as liberal as our exclusive merchandising plan is helpful. Wire or write for this plan of ARBORPHONE distribution. It assures volume business to ARBORPHONE dealers. Manufactured by PRECISION PRODUCTS CO. Dept. B321 S. Main Street Ann Arbor, Mich. National Factory Representative SANFORD BROS. 30 West Walton Place Chicago, 111. Vbu Can of a BLUE PRINTS FOR THE "ARISTOCRAT" RECEIVER DESCRIBED BY ARTHUR H. LYNCH IN THE NOVEMBER MAGAZINE CAN NOW BE OBTAINED AT YOUR RADIO DEALER'S IF HE CANNOT SUPPLY YOU SEND US HIS NAME AND ADDRESS. Price one dollar for complete set. THE GENEVA PLAN How Europe's Wavelengths Have Been Re-Allocated From a Central Bureau By ] Lawrence W. Corbett SOME eighteen months ago the Office Inter, national de Radiophonie came into being. This is a union of members gathered from European broadcasting organizations for the discussion and formulation of plans for the benefit of ail European listeners. The Secretary General of the Council is Arthur Burrows, one time "Uncle Arthur" of the British Broadcasting Company, while Admiral Carpendale, "second in command" of the present B. B. C., is President of the Council. The work of the organization is divided under three headings; Legal, Technical, and Artistic. It is with the Technical Committee that we are concerned, and this section is presided over by M. Braillard, of Belgium. When the Bureau first came into existence, of paramount importance was the chaotic state of affairs then prevalent in the European ether. The allocation of transmitting frequencies was then a matter of national concern, and the individual governments were not in a position to consider geographical positions on an international scale when assigning wavelengths to their own stations. The result was a hopeless tangle of overlapping frequencies, so serious in fact, that the B. B. C. had to state that it would not be possible to announce in advance any changes in the wavelengths of their stations necessitated by other stations pirating, knowingly or unwittingly, the wavelengths near enough to those they (the B. B. C.) were using to cause heterodyning. It was only a few weeks ago that the Office de Radiophonie announced their plan for the reorganization of the whole frequency allocation system of Europe, and there are those who will have it that the eighteen months taken to form this plan is out of proportion to the good that will result. The more serious minded will, however, realize that the mere working out of the plan on paper would not have been feasible, and that practical applications of the system had to be tried out very thoroughly before any definite plan could be arrived at. Many times during the eighteen months have temporary wavelengths been assigned to various of the European stations for a try-out, and only by such experiments has it been possible to present conclusive evidence that the plan will work. THE GENEVA PLAN THE "Geneva Plan," as it has been called, which will come into effect at about the time that this article appears in print, has caused the wavelengths from 201.3 to 588.2 meters to be divided into 90 distinct channels, each separated from its neighbor by 10 kilocycles. Of these f)<) channels, 83 are what are known as "exclusive" wavelengths, the remaining 16 being termed "common" wavelengths. The exclusive wavelengths are for the sole use of the particular broadcasting station to which they are allotted, while the common wavelengths are to be shared by those stations which have no exclusive wavelength. These latter will generally be low power stations, and when a common wave is alotted, care will be taken in its choice to choose a frequency that is not shared by another station geographically near at hand.