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Specifies preference type Specifies the title displayed by the Settings application Specifies the file used for the child pane

is packed on the field is preserved for recovery by the demodulation circuitry in the receiving device As we deal with very tiny signals in wireless networking, the antennas must be as efficient as possible The typical wireless network interface card (W-NIC) contains a small antenna that is usable in locations with adequate signal strength However, if the distances, surroundings, or line-of-sight attenuation dictates, you may need to add a supplementary antenna (Fig 133) External antennas often have a pattern that concentrates the signals from certain directions, effectively creating a signal gain, relative to an ordinary antenna Such gain antennas are often called range extenders, after their function Antennas may be either directional or omnidirectional An omnidirectional antenna is an antenna that transmits equally in all directions The only truly threedimensional omni antenna is the theoretical point-source, or isotropic, antenna Such an antenna, if perfectly matched to its source, would convert all its applied electrical energy to electromagnetic (EM) energy, and launch the EM (radio) waves in all directions The converse for receiving EM energy would be true, as well Bottom line: From any direction, in all three dimensions, the transmitted/received energy would be equal We rate real-world antennas in comparison to this theoretical model, in decibels above or below the isotropic model, or dBi Thus, a perfect isotropic antenna would be rated as unity gain, 0 dBi

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The PSChildPaneSpecifier is for specifying a child pane in the Settings application You define the settings in this pane in a separate plist file Table 14-6 summarizes PSChildSpecifier s settings

Figure 710 The WMP11 s Encryption dialog is where you set up the WEP encryption level and keys Expect interaction with this dialog to change your WEP key values when you change networks

Change the second child row s key to Title, type to String, and value to Shade Change the third child row s key to File, type to String, and value to Shades (Figure 14-14)

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Figure 14-14

14:

7

In order to optimize the transmission of the wireless network signal, we assume that most of the devices we want to access will be roughly along a plane parallel to the ground the floor of the building, for example We can make an antenna that does a better job of transmitting side to side than up and down When we measure the received signal strength from side to side (horizontally) for such an antenna, we find that it is greater than we would have expected from an isotropic antenna This type of antenna is commonly called a gain antenna A gain antenna that has equal gain in all horizontal directions (360 ) is what we usually mean when we describe an antenna as omnidirectional In reality, it has this gain in the horizontal plane, geometrically speaking, at the expense of directions away from horizontal Omnidirectional gain antennas typically have gains of 3 to 6 dBi, although it is possible to construct omnis with somewhat higher gains at greater expense The directional antenna, on the other hand, concentrates its gain in a single direction, both vertically and horizontally Two common types of directional antennas are the Yagi and the parabolic dish Each type produces a much narrower gain lobe of concentrated EM signal, which can almost be called a beam of energy We often call the directions where most of the signal is concentrated the beamwidth Directional antennas for this band usually range from around 12 to 15 dBi, although parabolic dishes can go as much as double that to 25 to 30 dBi The Yagi antenna (properly the Yagi-Uda Array, so named after its inventors) consists of an array of parallel conductive elements (Fig 134) The rear-most element is called the reflector, followed by the driven element (to which the signal is applied), and then a series of oddly spaced conductive elements that point in the.

Figure 14-15

3 Save 4 Create a new property list (Figure 14-15) Name the file Shades 5 Open Shadesplist in the editor and add one row Change the row s key to Title, type to

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