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Ferromagnetic substances can be crushed into dust and then bound into various shapes, providing core materials that greatly increase the inductance of a coil having a given number of turns. Depending on the mixture used, the increase in flux density can range from a factor of a few times, up through hundreds, thousands, and even millions of times. A small coil can thus be made to have a large inductance. Powdered-iron cores are common at radio frequencies. Ferrite has a higher permeability than powdered iron, causing a greater concentration of magnetic flux lines within the coil. Ferrite is used at lower radio frequencies and at audio frequencies, as well as at medium and high radio frequencies. The main trouble with ferromagnetic cores is that, if the coil carries more than a certain amount of current, the core will saturate. This means that the ferromagnetic material is holding as much flux as it possibly can. Any further increase in coil current will not produce a corresponding increase in the magnetic flux in the core. The result is that the inductance changes, decreasing with coil currents that are more than the critical value. In extreme cases, ferromagnetic cores can waste considerable power as heat. If a core gets hot enough, it might fracture. This will permanently change the inductance of the coil, and will also reduce its current-handling ability.

The simplest inductors (besides plain, straight lengths of wire) are coils. A coil can be wound on a hollow cylinder of plastic or other nonferromagnetic material, forming an air-core coil. In practice, the maximum attainable inductance for such coils is about 1 mH. Air-core coils are used mostly in radio-frequency transmitters, receivers, and antenna networks. In general, the higher the frequency of ac, the less inductance is needed to produce significant effects. Air-core coils can be made to have almost unlimited current-carrying capacity, simply by using heavy-gauge wire and making the radius of the coil large. Air does not dissipate much energy in the form of heat. It s efficient, even though it has low permeability.

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Solenoidal, or cylindrical, coils can be made to have variable inductance by sliding ferromagnetic cores in and out of them. This is a common practice in radio communications. The frequency of a radio circuit can be adjusted in this way, as you ll learn later in this book. Because moving the core in and out changes the effective permeability within a coil of wire, this method of tuning is called permeability tuning. The in/out motion can be precisely controlled by attaching the core to a screw shaft, and anchoring a nut at one end of the coil (Fig. 10-7). As the screw shaft is rotated clockwise, the core enters the coil, so that the inductance increases. As the screw shaft is rotated counterclockwise, the core moves out of the coil and the inductance decreases.

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Ferromagnetic substances can be crushed into dust and then bound into various shapes, providing core materials that greatly increase the inductance of a coil having a given number of turns. Depending on the mixture used, the increase in flux density can range from a factor of a few times, up through many thousands of times. A small coil can thus be made to have a large inductance. There are two main types of ferromagnetic material in common use as coil cores. These substances are known as powdered iron and ferrite.

Inductor coils do not have to be wound on cylindrical forms, or on cylindrical ferromagnetic cores. In recent years, a new form of coil has become increasingly common. This is the toroid. It gets its name from the donut shape of the ferromagnetic core. The coil is wound over a core having this shape (Fig. 10-8).

effort to determine the regulatory structure of the market they were attempting to create. Three options emerged from their discussions. The first was preservation of the monopolistic, single-operator concept, while the second advocated an open market, in which competition was opened to all comers and the market would sort itself out. The third involved a duopoly approach, in which two systems would be allowed in each major market area. After long debate, regulators and lawmakers decided on the duopoly concept, with two 20-MHz systems (A frequencies and B frequencies) allocated in each market. The A frequencies were allocated to the nonwireline company, whereas the B frequencies went to the wireline carrier. The first commercial cellular telephone system became operational in October of 1983. By 1985, there were 340,000 cellular subscribers; today there are over 16 million, with annual revenues of nearly $11 billion. It s interesting to note that in 1982, AT&T proudly predicted that there would be over 100,000 cellular subscribers by 1990.

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