EXPERIMENTAL RESEARCH INVESTIGATION OF EXTREMELY LOW FREQUENCY PROPAGATION
SPACE-GENERAL CORP EL MONTE CA
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Characteristics of ELF electromagnetic wave propagation were investigated by measuring the characteristics of cw signals transmitted over a 400 link. Propagation measurements were carried out during July and October 1962. Signal strength, received and transmitted signal phase, and atmospheric noise were recorded. Data reduction and analysis showed that received values of signal strength were 2 db less during nighttime and 4 db less during daytime than the values predicted by analytical studies carried out during the previous contract. Data reduction and analysis of the recorded phase data showed that more stable reference signal sources are required at transmitter and receiver. The form of the record obtained over a link which had approximately a 6 db signal to noise ratio in a 1 cp band indicates that a useful technique has been evolved. Atmospheric noise data was recorded for all transmission periods. This data is presented in the form of amplitude probability distributions and impulses per unit time distributions.
- Radiofrequency Wave Propagation