Chapter 3Components and Hacking/Modifying Parts for Radio Circuits

This chapter will present some of the basic components or parts needed for building radios. These components include variable capacitors, antenna coils, and transformers. Other parts that will be used in the projects include transistors, diodes, capacitors, and inductors.

Antenna Coils

Basically, the antenna coils that will be used in this book are the ferrite rod or ferrite bar types (Figure 3-1). These types of antenna coils are used commonly in all portable amplitude-modulated (AM) broadcast radios. They are small in size but receive radio-frequency (RF) signals equivalently in strength to the older, large air-core-loop antennas.

The antenna coil at the top of the figure is ...

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