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Because Frequency Division Multiple Access (FDMA) uses the full 30 kHz channels for one telephone call at a time, it is obviously wasteful (see Figure 22-1 ) FDMA, an analog technique, can be improved a little by using the same frequency in a Time Division Duplex (TDD) mechanism Here, one channel is used and time slots are created The conversation flows from A to and then from B to A The use of this channel is slightly more efficient However, when nothing is being sent, the channel remains idle Because digital transmission introduces better multiplexing schemes, the carriers wanted to get more users on an already strained radio frequency spectrum

Robot frame Drive motors Power transmission Batteries Wheels Electronics Radio control system Weapons Armor

Figure 22-1: FDMA slotting Additional possibilities for enhancing security and reducing fraud can be addressed with digital cellular and PCS Again, this appears to be a win-win situation for the carrier because it features:

Table 7-1

Probably the first consideration in your robot s design is how you re going to make it move Your choices are many, and could include slithering, swimming, floating in the air, or even climbing up a wall or rope More than likely, though, you re going to want a mobile bot that travels across a floor, and this will mean legs, tank treads and tracks, or wheels

Obviously, the carriers welcomed some of these discussions Once the decision was made to consider digital transmission, the major problem was how, what flavor to use, and how to seamlessly migrate the existing customer base to digital The digital techniques available to the carriers are the following:

2:

This check box toggles support of native SQL and MDX business rules in the Models created within an application This check box toggles the support of Excel macros within the end-user data-entry forms This is the name of the default model site that is created with the application Model sites are explained in the next section The name of the model site in our sample application is Budget (The root model site name can be a different name than the application name) This is the label for the root site, which is also unique internal identifier for the site This may or may not be the same as the Root Site name The name of the server that hosts the backend Analysis Service 2005 (SSAS) databases and cubes This is the location where the Application Creation scripts are stored for later manual execution We are not using this option in our example

Time Division Multiple Access (TDMA) Extended Time Division Multiple Access (ETDMA) Code Division Multiple Access (CDMA)

Wheels are the most effective way of providing propulsion to a bot They are cheap, and easy to mount, control, and steer, and there are several methods you can use We ll discuss all this in 3 There are many sources of bot wheels, from toys for the smaller bots to small trailer tires for larger machines Some builders have used wheels from industrial casters, lawnmowers, go-karts, and even small bicycles Your choice depends on the size and steering configuration of your bot s design The majority of bots use differential or tank-type steering (also known as skid steering ) This means that the bot uses different speeds for left and right wheels (or sets of wheels), causing the bot to go straight, or to one side or the other Having one wheel stopped and the other moving makes the bot pivot on the stopped wheel, and vice versa Having one wheel move forward and the other in reverse makes the bot spin about its center axis (We ll discuss this in more detail in 3) Once you choose your locomotion method, the first set of major components you need to identify are the motors Most motors operate at speeds that are way too fast to control the robot So, you ll need a gear reduction Some motors have built-in gearboxes, while others require a speed reduction system This can be in the form of gears, sprockets, belts, or even gearboxes 6 will talk about these various power transmission methods The advantage of a gear reduction is an increase in the torque to the wheels, which gives your bot more pushing power Another reason you should select your motors first is that they will dictate your electrical power requirements, which affects the battery and motor speed controller selections

GSM (using a slightly different form of TDMA) Narrowband Advanced Mobile Phone Service (N-AMPS)

Table 7-1

The welded frame structure of Minion (courtesy of Christian Carlberg)

Carriers and manufacturers are using each of these systems The various means of implementing these systems has brought about several discussions regarding the benefits and losses of each choice

Explanation of the Various Fields in the Create Application Dialog Box (continued)

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As the radio spectrum for cellular and PCS continues to become more congested, the two primary approaches in North America use derivatives of