Part 11 of the Federal Communications Commission's Rules and Regulations—Rules Governing Industrial Radio Services, effective July 1, 1949, now governs the use of radio in connection with geophysical prospecting. Paragraph 11.57e specifies that an application for authority to operate on one of the frequencies in the range 1.6–6.0 mc must be fully justified and accompanied by a showing that it is impossible to use a higher order of frequencies for accomplishment of the same purposes. This applies to the traditional medium frequencies 1602 to 1700 kc used in geophysical prospecting communications.

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