Page:United States Statutes at Large Volume 55 Part 2.djvu/157

 1028 TREATIES [5 5 STAT. APPENDIX VI MILEAGE SEPARATION TABLES The required separations between broadcasting stations as tabulated below are based upon the following conditions: 1. The use of nondirectional antennas. 2. Antenna efficiencies (in mv/m at one mile for one kilowatt) Class I - 225 mv/m Class II and III - 175 mv/m Class IV - 150 mv/m 3. Frequency, 1000 kc. 4. Soil conductivity, s = 10- ' 3. 5. Soil dielectric constant, e = 15. 6. Groundwave transmission as shown on chart in Appendix IV. 7. Skywave transmission as shown on chart in Appendix V. 8. Protection to service areas as shown in Appendix II, Table I. 9. Ratio of desired to undesired signal: Ratio of Channel Separation Desired to Undesired Same Frequency 20:1 10 kc 2:1 20 kc 1:10 30 kc 1:50

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