63 STAT.] IMULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter III, art. 9 RR) (248-252) countries of the European Area, the option mentioned in 88 may not be exercised, within the limits of the European Area, for the purpose of effecting a broadcasting service out- side the bands allocated to that service by these Regulations on frequencies below 1605 kc/s. 248 (3) In principle, the previous arrangements referred to in the preceding paragraph are concluded at Broadcasting Conferences of the countries of the European Area. However, if a country desires to establish such a service or to obtain a modification of the conditions fixed by a previous arrange- ment relating to such a service (frequency, power, geo- graphical position of the stations, etc.) in the interval be- tween two such conferences, it shall so inform the countries of the European Area at least three months in advance through the medium of the Secretary General of the Union. Any country which has not answered within a period of six weeks after receipt of the communication in question shall be con- sidered as having given its consent. 249 (4) In the case of a broadcasting station in the Euro- pean Area working outside the authorized bands of frequen- cies, it is understood that such previous arrangement will also be necessary on every occasion when a change which might affect the conditions of international interference is to be made in the characteristics which have been previously in- serted in the Master International Frequency Register. 250§3. Broadcasting in the Tropical Zone. 251 (1) In these Regulations, the expression "broadcasting in the Tropical Zone" indicates a type of broadcasting, for internal national use in countries in the zone defined in 252, where it-may be shown that because of difficulty of high atmos- pheric noise level and propagation it is not possible to furnish economically a more satisfactory service through the use of low, medium or very high frequencies. 252 (2) The Tropical Zone (see appendix 16) is defined as: a) the whole of that area in Region 2 contained between the Tropics of Cancer and Capricorn: 1703
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