Tennessee Valley Authority´s Radio Interference Experiences on 500-kY Transmission Lines

This paper describes a two-year investigation of radio interference (RI) levels in the vicinity of 400 miles of operating 500- kV transmission lines. Discussions are given of instruments, antennas, and types of surveys; the design and development of RI monitoring stations; and comparisons of the relative merits of various supplementary items. Results from RI profiles, RIV measurements, and monitor station recordings are analyzed and presented along with brief discussions of signal-to-noise ratios and evaluation of TVA´s transmission line design and construction techniques.