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9/13/40
However, the correlated shifting of the frequencies of some 100 broadcast stations in Canada, and of numerous stations in Mexico and Cuba will serve to eliminate in considerable measure the long-complained of interference from these sources, and thereby improve broadcast reception in the North American continent gen¬ erally. Interference from Mexican and Cuban stations has been particularly objectionable to the rural listeners.
For one thing, certain obnoxious broadcast stations on the Mexican border are to be eliminated. These stations are largely run by persons denied the use of frequencies in the United States. They have featured the types of programs which caused them to be eliminated from the United States scene. The Havana pact contains no orovision for the continued operation of these highpowered stations just across the border.
The United States broadcaster, on his part, does not have to replace present transmission and other expensive equipment. His chief concern will be to change the quartz crystals which con¬ trol a station's operating frequency. Though this is a small item, it will take some time to obtain the 2000 or more needed crystals from the comparatively few manufacturers who grind and calibrate them to order.
In carrying out the agreement, the Commission has made every effort "to preserve the broadcast structure in the United States so that minimum interference in frequency assignments would be required. " Of course, blanket shifts were not possible in every instance, and certain stations had to be considered individually in their relation to the new set-up as a whole. When a considerable change in frequency was found imperative, the Commission's engi¬ neers have striven to provide a new assignment with less potential interference than exists on the present frequency, or the licensee is afforded opportunity to increase his power to maintain sub¬ stantially his present service area. In making such general re¬ allocations, however, it is necessary for the Commission to amend its rules governing standard broadcast stations in some technical particulars.
By far the large st portion of the 777 stations which have to shift will be those stations which will move up 30 kilocycles.
A breakdown of the effect of the change on the 862 standard broad¬ cast stations follows:
Change Nurabe r o f
Stations Affected
No change 85
Move up 10 kilocycles . 20
Move up 20 kilocycles . 26
Move up 30 kilocycles . 614
Move up 40 Ailocycies . 25
Move down 10 kilocycles . 64
Irregular shifts . 28
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