A LOW-FREQUENCY IONOSPHERE RECORDER

National Bureau of Standards

Peer Reviewed

Abstract: As an outcome of the increased interest and demand for more information concerning low-frequency radio propagation phenomena, the National Bureau of Standards has developed a low-frequency recorder to probe the ionosphere. The recorder, developed by J.M. Watts, J.N. Brown, and J. C. Blair of the Bureau’s Central Radio Propagation Laboratory, utilizes many of the the principles incorporated in high-frequency recording equipment Its operating frequencies of 50 to 1100 kc are produced by using the beat frequency method of generating wide frequency sweeps. Wide-band transmitter amplifiers, which utilize transformers containing ferromagnetic cores, deliver over 200 kilowatts of pulsed power; but because of practical limitations an inefficient antenna system is used.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 3, Number 9
Pages: 340 - 343
Cite this article: Standards, National Bureau of, "A LOW-FREQUENCY IONOSPHERE RECORDER", NAVIGATION, Journal of The Institute of Navigation, Vol. 3, No. 9, 1953, pp. 340-343.
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