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The tape itself consists of millions of particles of iron oxide, attached to a plastic or mylar strip. A fluctuating magnetic field, produced by the recording head, polarizes these particles. As the field changes in strength next to the recording head, the tape passes by at a constant, controlled speed. This produces regions in which the iron-oxide particles are polarized in either direction (Fig. 8-10). When the tape is run at the same speed through the recorder in the playback mode, the magnetic fields around the individual particles cause a fluctuating field that is detected by the pickup head. This field has the same pattern of variations as the original field from the recording head. Magnetic tape is available in various widths and thicknesses, for different applications. The thicker tapes result in cassettes that don t play as long, but the tape is more resistant to stretching. The speed of the tape determines the fidelity of the recording. Higher speeds are preferred for music and video, and lower speeds for voice. The data on a magnetic tape can be distorted or erased by external magnetic fields. Therefore, tapes should be protected from such fields. Keep magnetic tape away from magnets. Extreme heat can also result in loss of data, and possibly even physical damage to the tape.

The properties of a transformer depend on the shape of its core, and on the way in which the wires are wound on it. There are several different geometries used with transformers.

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The age of the personal computer has seen the development of ever-more-compact data-storage systems. One of the most versatile is the magnetic disk. A magnetic disk can be either rigid or flexible. Disks are available in various sizes. Hard disks store the most data, and are generally found inside of computer units. Floppy disks or diskettes are usually either 31/2 or 51/4 inch in diameter, and can be inserted and removed from recording/playback machines called disk drives. The principle of the magnetic disk, on the micro scale, is the same as that of the magnetic tape. The information is stored in digital form; that is, there are only two different ways that the particles are magnetized. This results in almost perfect, error-free storage.

Splices can result in service impairments due to cold solder joints, corrosion, or weakening effects caused by the repeated bending of wind-driven aerial cable. Gauge changes tend to have the same effects that plague circuits with unterminated bridged taps. When a signal traveling down a wire of one gauge jumps to a piece of wire of another gauge, the signal is reflected, resulting in an impairment known as an intersymbol interference. The use of multiple gauges is common in a loop deployment strategy because it enables outside plant engineers to use lower-cost small gauge wire where appropriate, cross-connecting it to larger-gauge, lower-resistance wire where necessary.

E Core A common core for a power transformer is the E core, so named because it is shaped like the capital letter E. A bar, placed at the open end of the E, completes the core assembly after the coils have been wound on the E-shaped section (Fig. 18-4A). The primary and secondary windings can be placed on an E core in either of two ways. The simpler winding method is to put both the primary and the secondary around the middle bar of the E (Fig. 18-4B). This is called the shell method of transformer winding. It provides maximum coupling between the windings. However, this scheme results in considerable capacitance between the primary and the secondary. Such interwinding capacitance can sometimes be tolerated, but often it cannot. Another disadvantage of the shell geometry is that, when windings are placed one on top of the other, the transformer cannot handle very much voltage. High voltages cause arcing between the windings, which can destroy the insulation on the wires and lead to permanent short circuits. Another winding method is the core method. In this scheme, one winding is placed at the bottom of the E section, and the other winding is placed at the top (Fig. 18-4C). The coupling occurs

8-10 On recording tape, particles are magnetized in a pattern that follows the modulating waveform.

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by means of magnetic flux in the core. The interwinding capacitance is lower than it is in a shellwound transformer because the windings are physically farther apart. Also, a core-wound transformer can handle higher voltages than a shell-wound transformer of the same physical size. Sometimes the center part of the E is left out of the core when the core winding scheme is used. Shell-wound and core-wound transformers are almost universally employed at 60 Hz. These configurations are also common at AF.

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