8/28/2023 0 Comments How to read a smith chart![]() ![]() Nautel webinars (and Transmission Talk Tuesday round-tables) qualify for a ½ SBE Recertification Credit. Special Guest: Stephen Lockwood, President/Senior Electrical Engineer, Hatfield and Dawson Consulting Engineers. Arguably the most important metric in an HD Radio or DTV signal, it’s also one of the most overlooked. For S21, the magnitude plot makes sence, because it. So really whats going on is ADS is plotting the reflection coefficient against lines that arent shown on the chart, and youre reading the impedance off the lines that are on the chart. For the FM HD (and DTV) folks in the audience, we also discuss MER – what it means, how it’s displayed and how MER translates directly to coverage of your digital signal. Then the Smith chart lines would give you the impedance without having to do any tedious calculations. ![]() Admittances add together for shunt-connected circuits. In this session, Jeff and guest Stephen Lockwood, of Hatfield and Dawson Consulting Engineers in Seattle, look at the Smith Chart, how to read it and what it can tell you. Keep in mind that BjwC for a capacitor, and B1/jwL for an inductor. A network analyzer is a great tool for determining your load impedance across the operating bandwidth of your signal and typically displays the results on a Smith Chart. One of the great things about Nautel’s AUI is the unprecedented amount of instrumentation it brought to the transmitter industry. ![]()
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