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The field strength of medium and short wave communication system was calculated and correlated for different wavelengths from the predicted local transmitter to different receiving points at different local times by using Vvednsky and Kazantsev method. A correlation constant is formulated that satisfies the relationship between the field strength of medium wave and short wave communication system. It was observed that this correlation constant varies with local time and wavelength. The average value of the correlation constant is maximum at night and minimum at noon. The calculated field strength of short wave communication system is almost the same with the results obtained by using correlation constant.
