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be no incentive to improve receivers. A medium must be struck and it is this medium which forme the basis for the allocation planB of the Commission,
” In the establishment of the existing allocation of broadcast stations, the Commission has given close attention to the progress made in the art by the manufacturers of radio receiv¬ ing. sets. This has been necessary because there is a close relationship between the selectivity of present day receivers and the spacing of stations from a geographical standpoint so as to eliminate interference. A year or so ago a broadcasting station located in a large metropolitan area filed application for a frequency only 30 kilocycles away from another station located in the same geographical area. The Commission denied the applica¬ tion after a hearing, because it appeared from the evidence adduced that present day receiving sets were incapable of producing ade¬ quate discrimination between two signals separated by only 30 kilocycles. This was the considered opinion of a well known radio engineer who is director of engineering for one of the largest radio receiving set manufacturing companies. He testified at that hearing that on the basis of the measured performance of a large number of broadcast receivers with which he was personally familiar present day receivers even the most modern of them would be inoapable of sufficient discrimination to take care of a 30-kilocycle separation, and that such a separation would render inade¬ quate and unsatisfactory the million of receivers which have already been sold by the manufacturers.
"The Court of Appeals upheld the Commission^ decision and found that its rule requiring a separation of 50 kilocycles between stations located in the same geographical area was a reasonable one. I give you this instance to show you that the Commission os keeping a close watch upon the progress made by radio receiving set manufacturers. I can promise you that if the time oomes when radio receiving sets can be manufactured capable of producing adequate discrimination between signals with a lesser separation, the Commission will not be far behind in revising its rules as the public interest may require. It is, of course, manifest what such a move would mean to the listening public,
"It is a difficult task to obtain an average of a large number of different makes of receiving sets which are dissimilar in characteristics. The Commission has collected a large amount of data on selectivity in receiving sets and has attempted to develop what it believes to be a fair average. If the selectivity is incorrect and does not reflect a proper average then the Commis¬ sion invites you to submit an analysis of what the Association considers a proper average of selectivity.
"The Commission has diligently endeavored to maintain very high standards for the transmitters of broadcast stations and has insisted on accurate monitoring equipment. These standards are set up in order to give the best possible service to the listening public. Transmitters witn very few exceptions are capable of giving high quality transmission. It is equally
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