55 SrAT.] INTER-AMERICAN-RADIO COMMUNICATIONS-JAN. 26, 1940 ARTICLE 5. Non-essential Radiations (1) In order to prevent non-essential radiations, the selection and operation of transmitting apparatus should be inspired by the most recent progress of the art; and to this end, the recommendations of the C.C.I .R. should be taken into account. (2) The participating Governments agree to require stations under their jurisdiction to use transmitters which are as free as practicable from all spurious emissions. (3) These radiations should not be of sufficient intensity to cause interference on receiving sets of modern design which are tuned out- side the frequency band of emission required for the type of emission employed. In the case of type A-3 emission' (radiotelephony), the transmitter should not be modulated in excess of its modulation capability to the extent that interfering spurious radiations occur and in the case of amplitude modulation the operation percentage of modulation should not be less than 75 percent on peaks of frequent recurrence. Adequate means should be employed to insure that the transmitter is not modulated in excess of its modulation capability. (4) A non-essential radiation is any radiation from a transmitter which is out-side the frequency band of emission normal for the type of transmission employed, including any harmonic modulation prod- ucts, key clicks, parasitic oscillations or other transient effects. ARTICLE 6. Suppression of Interference caused by Electrical Apparatus The American countries shall adopt measures to suppress or alle- viate, as much as possible, interference caused by apparatus or equip- ment which may generate, or radiate radio frequency currents capable of interfering with, or adversely affecting, the reception of radio transmissions. (See Annex No. 1).[1] ARTICLE 7. International Police Services 1.- When the signatory countries authorize their police stations which are located in close proximity to the national boundaries of contiguous countries to transmit emergency information with similar stations of another country, the following rules shall be applied: Rules a) Only police stations located close to the boundaries of con- tiguous countries shall be allowed to engage in this exchange of information. b) In general, only important police messages are to be handled, such as those which would lose their value due to slowness and time limitations of other communication systems. '[P. 1501.] 1487
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