TREATIES [55 STAT. APPENDIX II TABLE I PROTECTED SERVICE CONTOURS AND PERMISSIBLE INTERFERENCE SIGNALS FOR BROADCAST STATIONS Class of Class of station channel used Boundary or signal In- tensity contour of area Permissible protected from objec- power tionable interference - Permissible interfering signal Day Night I A Clear 50 kw or more Boundary of coun- try in which sta- tion is located I B Clear 10 kw to 50 100 uv/m 500 uv/m kw (50% sky II Cleara 0.25 kw to 50 kw IIIA Regional 1kwto5kw III B Regional 0.5 kw to 1 kw night and 5 kw day IV Local 0.1 kw to 0.25 kw wave) 500 uv/me 2500 uv/m (Ground wave) 500 uv/m 2500 uv/m (Ground wave) 500 uv/m 4000 uv/m (Ground wave) 500 uv/m 4000 uv/m (Ground wave) Day Night · 5 uv/m 25 uv/m 5 uv/m 26 uv/m 25 uv/m * 125 uv/m 25 uv/m 25 uv/m 25 uv/m 125 uv/m 200 uv/m 200 uv/m
- In accordance with other provisions in this Agreement this freedom of interference does not apply out-
side the boundaries of the country in which the station Is located. b From other stations on same channel only. For adjacent channels see Appendix III, Table I.
- Sky wave field Intensity exceeded for 10% of the time.
No Class II station shall be assigned to the same channel as a Class I A station for nighttime operation (from sunset to sunrise) less than 650 miles of the nearest border of the country in which the Class I A station is located.
- These values are with respect to interference from all stations except Class I, which stations may cause
interference to a field intensity contour of higher value. However, it is recommended that Class II sta- tions be so located that the interference received from Class I stations will not exceed these values. If the Class II stations are limited by Class I stations to higher values, then such values shall be the standard established with respect to interference from all other classes of stations. 1024
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