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HAE8 NEWS LETTER,...Febo 15, 1940...Page 6 Wier, I, R, s Frequency Modulated Transmitters, Eleotronios . p. 30, (Nov. 1939) o Frequency Modulation—A Revolution in Broadcasting, Electronics . p, 10, (Jan. 1930). Shelby, Robert E*s A Gathode-Ray Frequency Modulation Generator, Electronics, p. 14, (Feb. 1940). Carnahan, 0, W 0 and A. V. Laughren* Frequency Modulation in Television—A Sympositim, Electronics , p. 26, (Feb. 1940). FM HEARING POSTPONED At the request of a number of interested parties for more time in whioh to complete their material, the informal hearing before the Federal Communications Commission in the matter of aural broad¬ casting on frequencies above 25,000 kilocycles, whioh was scheduled for February 28, 1940, has been postponed to March 18, 1940. The final date for the filing of written statements, sketches, drawings, eto., in connection with argument, has been extended to March 11. In order to expedite the proceedings, witnesses will not be permitted to read prepared statements into the reoord during the hearings. FCC TO ACCEPT EXPERIMENTAL F-M APPLICATIONS ON NON-BROADCAST BANDS To obtain more factual data about frequency modulation for services other than broadcast, the Federal Communications Commission today announced that it will accept applications for such experimental authorisations on the frequencies allocated to those services above 30,000 kilocycles. This applies to such services as emergency, aviation, and those miscellaneous radio services not directly involved by the Commissions informal engineering hearing, scheduled to begin February 28, primarily to consider frequency modulation as applied to the standard broadcast service. Frequency modulation is claimed to offer definite advantages over existing amplitude modulation systems in the police end aviation services. In the police service, eaoh system is under the direct control of one licensee who can plan and control the installation and operation of both the transmitting and receiving systems. There are approximately 1,000 police radio systems with more than 6,000 transmitters (including headquarters and patrol oars' now using amplitude modulation. On the basis of the reports required to be submitted under the experimental rules, and after observation of operation by Commission personnel, decisions will be reached as to whether and under what conditions frequency modulation can be regularly authorized for use in the non-broadcast services.