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Ham and Shortwave Radio for the Electronics Hobbyist by Stan Gibilisco

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CHAPTER 7

Ham Antenna Primer

Ham radio antennas fall into two categories: receiving types and transmitting types. Nearly all transmitting antennas can receive signals effectively within the design frequency range. Some, but not all, receiving antennas can transmit signals with reasonable efficiency.

 

Radiation Resistance

When RF current flows in an electrical conductor, such as a wire or a length of metal tubing, some EM energy radiates into space. Imagine that you connect a transmitter to an antenna and test the whole system. Then you replace the antenna with a resistance/capacitance (RC) or resistance/inductance (RL) circuit and adjust the component values until the transmitter behaves exactly as it did when connected to the real antenna. ...

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