Journal of the Society of Motion Picture Engineers (1930-1949)

130 EXCERPTS FROM FCC REPORT Vol 44, No. 2 prepare to employ much stricter engineering standards in future operations, such as improved frequency tolerances, reduced harmonic and other spurious emissions, better receiving equipment, etc. Most efficient use of the available spectrum space can only be realized by each station in all services employing the most improved techniques for the conservation of frequency space and by complete cooperation among the various services. Improvement in receiver performance is particularly important. For example, if the advantages of frequency modulation are to be obtained such as to warrant the required spectrum space, it is essential that well-designed frequency modulation receivers be provided. Such receivers must have proper selectivity, limiter and discriminator characteristics. Further, it is urged that no receivers for any service be manufactured which radiates an appreciable signal. A radiating receiver is in effect a low power transmitter often capable of causing serious interference to other receivers in the same or other services. The slight difference in cost between a well-designed receiver and one of poor design is more than offset by the gain to all services. It is expected that post-war receivers will be designed and manufactured so as to minimize the effects of image frequency response, radiation from beat frequency oscillators and other effects that may be directly attributed to equipments of inferior design and performance. "The allocations which the Commission is proposing, and which are set out in section 5 of this Part for frequencies above 25,000 kilocycles, were arrived at by the application of the foregoing general principles." PART II DISCUSSION OF PROPOSED ALLOCATION BY SERVICES SECTION 1 —INTRODUCTORY "The succeeding eighteen sections of this Part contain a discussion of the allocations which the Commission is proposing to make to the various non-governmental radio services from 25 megacycles to 30,000 megacycles. There is a separate section for each of the radio services or groups of related services which were made the matter of individual consideration at the hearing, and for convenience in referring to the transcript, each section bears the same number as does the appropriate volume or volumes of the transcript containing the testimony for the service in question. "Each of the sections starts out with introductory material concerning the history and present status of the service in question. Then comes a table containing the names of the witnesses who testified concerning the particular service, the company or organization they represented, and the transcript pages where their testimony may be found. This is followed by a discussion of the various proposals which were made at the hearing and the allocation which the Commission proposes to make and the reasons therefor. In each case there is a full discussion of every proposal that was made at the hearing concerning the appropriate place in the spectrum, width of channel, and total number of channels. The sections indicate whether the requests were granted or denied and if denied the reasons for the denial are given. "A word of caution should be added. Most, if not all, of the allocations which we propose at this time cannot be placed into effect until after transmitter, receiver and other materials, facilities and manpower again become available for