Download e-book for kindle: A copious phraseological English-Greek lexicon by Thomas Kerchever 1800-1853 Arnold, Henry 1804- Browne, J

By Thomas Kerchever 1800-1853 Arnold, Henry 1804- Browne, J Wilhelm Fradersdorff

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The design of supports for the feed should permit removal and replacement of the feed without impairing its alignment with respect to the reflector. It is desirable to have an arrangement that will permit removal of the feed without removal of its supports. Permissible variations in alignment between feed and reflector should be determined by actual measurement of the pattern. The design should be such that reflectors and feeds are interchangeable within the allowed tolerances. WIND LOADS ON REFLECTORS The land-based and particularly the shipborne antennas are designed The resultant wind forces exert for operation in winds of high velocity.

0035-in. diameter round monel wire, knit into a mesh containing seven loops per inch. I Reflectivity is excellent with both 10- and 3-cm radiation when the mesh is new; but because the conductivity between loops is reduced by corrosion or oil films, the reflectivity may be lowered by as much as 50 per cent. This material is of interest as a reflecting medium, but it obviously does not constitute a rigid antenna surf ace. TABLE22,-MEsH Mesh No. 73 0,007 * Specified windvelocities thatthereflectors canwithstand without~truct”ral damage.

D. Jmobus. sections writtenby other authors are as follows: Sec. 5, R. J. Grenzeback;Sec. 16, H. A. 17 and 2-18, M. B. Karelitz; Sec. 19, V. G. Bruce. 2 sharp back lobe of the same pattern as the one that would exist in the absence of the reflector. They can beused on any of awide variety of paraboloidal reflectors, however, because the radiation escaping through Even here, leakage of radiation the grill is not focused in a sharp beam. in excess of 5 per cent is considered undesirable. 2. -The primary mechanical requirement affecting antenna design, particularly with large reflectors, is structural rigidity.

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A copious phraseological English-Greek lexicon by Thomas Kerchever 1800-1853 Arnold, Henry 1804- Browne, J Wilhelm Fradersdorff


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