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Although the architectural goal of most cellular providers is to create a mosaic of thousands of very small cells, called microcells or picocells, that s an expensive proposition and will not happen immediately Finally, cellular systems rely on a technique called cell-to-cell handoff, which simply means that the cellular network has the capability to track a call (using relative signal strength as an indicator) as the user moves across a cell When the signal strength detected by the current cell is perceived by the system to be weaker than that detected by the cell the user is approaching, the call is handed off to the second cell Ideally, the user hears nothing Cell handoff and other cellular system capabilities are under the central control of a Mobile Telephone Switching Office or (MTSO, sometimes pronounced Mitso )..

Transmission lines usually take either of two forms, the parallel-wire type or the coaxial type. A parallel-wire transmission line consists of two wires running alongside each other with a constant spacing (Fig. 10-10). The spacing is maintained by polyethylene rods molded at regular intervals to the wires, or by a solid web of polyethylene. You have seen this type of line used with television receiving antennas. The substance separating the wires is called the dielectric of the transmission line. A coaxial transmission line has a wire conductor surrounded by a tubular braid or pipe (Fig. 10-11). The wire is kept at the center of this tubular shield by means of polythylene beads, or more often, by solid or foamed polyethylene dielectric, all along the length of the line.

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Short lengths of any type of transmission line behave as inductors, as long as the line is less than 90 electrical degrees in length. At 100 MHz, 90 electrical degrees, or 1 4

Line Inductance Short lengths of any type of transmission line behave as inductors, as long as the line length is less than 90 (1 4 of a wavelength). At 100 MHz, 90 in free space is 75 cm, or a little more than 2 ft. In general, if f is the frequency in megahertz, then 1 4 wavelength in free space, expressed in centimeters (scm), is given by this formula:

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Table 2-1. Resistivity for copper wire, in terms of the size in American Wire Gauge (AWG).

scm = 7500/f The length of a quarter-wavelength section of transmission line is shortened from the free-space quarter wavelength by the effects of the dielectric. In practice, 1 4 wavelength along the line can be anywhere from about 0.66 (or 66 percent) of the free-space length for coaxial lines with solid polyethylene dielectric to about 0.95 (or 95 percent) of the free-space length for parallel-wire line with spacers molded at intervals of several centimeters. The factor by which the wavelength is shortened is called the velocity factor of the line. The shortening of the wavelength in a transmission line, compared with the wavelength in free space, is a result of a slowing down of the speed with which the radio signals move in the line compared with their speed in space (the speed of light). If the velocity factor of a line is given by v, then the preceding formula for the length of a quarter-wave line, in centimeters, becomes: scm = 7500v/f Very short lengths of line a few electrical degrees produce small values of inductance. As the length approaches 1 4 wavelength, the inductance increases. Transmission line inductors behave differently than coils in one important way: the inductance of a coil, particularly an air-core coil, is independent of the frequency. But the inductance of a transmission-line section changes as the frequency changes. At first, the inductance becomes larger as the frequency increases. At a certain limiting frequency, the inductance becomes theoretically infinite. Above that frequency, the line becomes capacitive rather than inductive. You ll learn about capacitance in the next chapter.

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Wire size, AWG 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Resistivity, ohms/km 0.52 0.83 1.3 2.7 3.3 5.3 8.4 13 21 34 54 86 140 220 350

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