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Propagation at 412 Megacycles from a High-Power Transmitter

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1 Author(s)
Gerks, I.H. ; Collins Radio Company, Research Div., Cedar Rapids, Iowa

Extended measurements are reported which indicate the existence of pronounced nocturnal superrefraction during an appreciable percentage of the summer and of very persistent scattering by atmospheric turbulence near the surface in all seasons. The measurements were taken over rolling midwestern terrain at a distance of about 100 miles. Mobile road tests were made to supplement the fixed-point measurements and to provide an approximate indication of the relation between field strength and distance. Aerial tests were made to show the effects of antenna height at large distance. Graphs are provided which show the effects of distance, terrain, antenna height, and time upon the field strength. The practical significance of the results in the broadcast and commmunication fields is indicated.

Published in:

Proceedings of the IRE  (Volume:39 ,  Issue: 11 )

Date of Publication:

Nov. 1951

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