ELF Propagation Study (Phase 2 - Fall 1971)
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
Pagination or Media Count:
An experimental measurement program has been undertaken to determine the parameters for propagation in the 40 and 70 Hz range. A transmitter in Wisconsin WTF transmitted simple sinusoidal signals for two eight-hour periods per day for 20 days. The radiated power was 14 watt at 45 Hz and 12 watt at 75 Hz. Receiver sites were located in Utah, Nova Scotia and Hawaii. Subject to the constraints detailed in the text, estimates of the attenuation rates and the mode excitation factors have been determined with high accuracy. The daytime attenuation rates were found to be higher than those estimated previously on the basis of theoretical calculations. The nighttime excitation factor was also found to be a few dB smaller than previously expected.
- Radiofrequency Wave Propagation