![]() When oriented so that the resistance axis is horizontal, positive reactances are plotted above the resistance axis and negative reactances below. Points on the reactance axis have a resistance of 0 ohms. ![]() The arcs on a Smith chart represent points with constant reactance, and the large outer circle on which the reactance arcs terminate is called the reactance axis. QUESTION: On the Smith chart shown in Figure E9-3, what is the only straight line shown? (E9G07) ANSWER: The resistance axis QUESTION: What are the two families of circles and arcs that make up a Smith chart? (E9G04) ANSWER: Resistance and reactance QUESTION: What type of coordinate system is used in a Smith chart? (E9G02) ANSWER: Resistance circles and reactance arcs In practice, you want to position the chart so that 0 ohms is at the far left, while infinity is at the far right. Points on this axis are pure resistances. ![]() The resistance axis is the only straight line on the Smith chart. The Smith chart coordinate system is comprised of resistance circles and reactance arcs. While a complete discussion of the theory behind the Smith Chart is outside the scope of this study guide, a good discussion of the Smith Chart can be found on the ARRL website. A Smith chart, shown in Figure E9-3 above, is a chart designed to solve transmission line problems graphically.
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