EXPERIMENTAL RESEARCH INVESTIGATION OF EXTREMELY LOW FREQUENCY PROPAGATION.
Abstract
Characteristics of ELF electromagnetic wave propagation were investigated by measuring the characteristics of CW signals transmitted over a 400 cps link, over a distance of 3000 km. A 67-mile section of power transmission line was used to radiate the 400 cps energy. Data which could be reduced to yield signal strength, attenuation rate, transmission path phase variations, and atmospheric noise amplitude probability distributions (APD) were recorded at the receiver site. The measured attenuation rate was 3.5 db/1000 KM for a nighttime path and 9 db/1000 KM for a daytime path. Reduction and analysis of the transmission path phase data showed sunrise diurnal phase variations ranging from 150 to 200 degrees. Measurements are compared with path characteristics calculated using existing theoretical treatments of ELF propagation. Atmospheric noise data were recorded for all transmission periods. Samples of these data are presented in the form of amplitude probability distributions and impulses per unit time distributions. Performance measurements and calculations for the power line transmitting antenna are presented. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1964
- Accession Number
- AD0437777
Entities
People
- G. R. Dunn
- P. F. Kuhnle
- R. D. Smith