Abstract
THE typical rotating back-scatter sounder1,2 uses a horizontal 3 or 4 element Yagi for both transmission and reception. The main-lobe width for such aerials is commonly about 60° between half power points, and when the aerial is used in conjunction with a ‘transmit–receive’ switch the effective lobe width reduces to about 40°. This means that echoes will tend to become ‘smeared out’ in azimuth to a greater or lesser degree depending on the received signal strength.
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References
Villard, O. G., and Peterson, A. M., Trans. Inst. Rad. Eng., PGAP-3, 186 (Aug. 1952).
Shearman, E. D. R., Proc. Inst. Elec. Eng., 103, B, 203 (March 1956).
Peterson, A. M., “Annals of I.G.Y.”, 3, Part 4 (Pergamon Press, 1957).
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THOMAS, J., MCNICOL, R. A Highly Directive Rotating Array for 16 Mc./s.. Nature 187, 398–399 (1960). https://doi.org/10.1038/187398a0
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DOI: https://doi.org/10.1038/187398a0
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