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Arduino Projects for Amateur Radio by Dennis Kidder, Jack Purdum

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CHAPTER 14

A Directional Watt and SWR Meter

When Dennis was back in engineering school, one of his passions was fast cars. Light weight, lots of horsepower; that was the ticket (…often literally!). But, a little too heavy on the throttle and all that power was wasted when the tires broke loose and would spin freely. So, what does this have to do with radio? Being a “radio guy,” Dennis realized that he needed a better match between the car and the pavement; a lower SWR! One solution: wider tires!

Way back in 1840, a Russian, Moritz von Jacobi, determined that the maximum power transfer in a circuit occurred when the source resistance was equal to the load resistance. The maximum power transfer theorem, as we know it today, is also referred to ...

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