If a value of 50 ohm is assigned to prime center, corresponding values will be 25, 10 and 100 ohm. If prime center is assigned a value of 100 ohm, then 0.5 represents 50 ohm, 0.2 represents 20 ohm, 2.0 represents 200 ohm, etc. The calibration of this line runs from 0 at the top to infinity (∞) at the bottom. The numbers along this line indicate percentages of the value assigned to the center point - the 100 per cent point indicated by the numeral 1.0 - usually referred to as prime center. The only straight line on the Chart - the vertical one in Fig. 1, the Smith Chart (1) consists basically of a circle upon which are placed various circular scales. But a brief description of its construction and some of its simpler applications will show that it is far less complicated than its aspect. In All probability, the chief reason that more use of the Smith Chart is not made by amateurs in solving some of their antenna-feeding problems is its formidable appearance at first glance. In this article, K6CRT discusses the use of the Chart in some of its simpler applications. This device eliminates the need for mathematical gymnastics and greatly reduces the laborious task of solving most transmission-line problems. One of the most useful tools at the disposal of the radio engineer is a transmission-line calculator known as the Smith Chart.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |