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Electromedical equipment may interfere with radio communication. Physicians do not, of course, desire to interfere with radio communications, but owing to the characteristics of the equipment a portion of the energy may escape the apparatus and appear in space as an unwanted radio signal, thus interfering with communications. Although great progress has been made in the construction of x-ray apparatus, the old type of x-ray equipment is still a source of interference. Efforts have been made to solve this problem in the field of diathermy. Cooperation now prevails among the several interested groups, including the Federal Communications Commission, the manufacturers of electromedical equipment, the radio communications interests and the Council on Physical Therapy, which represents the medical profession.
In countries now at war, drastic steps in the control of diathermy machines have had to be taken. The rule here quoted, placed in effect in 1939, applies in England:
INTERFERENCE WITH RADIO COMMUNICATIONS. JAMA. 1941;117(21):1787-1788. doi:10.1001/jama.1941.02820470035013