Powerful ultraviolet light sources

✍ Scribed by R.H.O.

• Publisher: Elsevier Science
• Year: 1941
• Tongue: English
• Weight: 120 KB
• Volume: 232
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(41)90607-5

✦ Synopsis

Oct., I94I.] CURRENT TOPICS. 4OI

developments of international broadcasting in the R. C. A. Review explains that directive aerials are designed with the proper compromise between power gain and beam width, because one is obtained at the expense of the other. For instance, a beam broad enough to "searchlight" over all of South America would have such a low power gain that it would not provide the strong signal intensity required for satisfactory service. Mr. Guy points out that the design of aerials of very high power gain presents no special problem itself. In fact, he says, it would be a comparatively simple matter to increase the power gain to the point where a somewhat higher concentration of field intensity is obtained in one area at the excessive sacrifice of adjoining areas of importance. R. H. O.