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The coaxial cable and broadband amplifier technologies define the essential capabilities of cable networks But we also need to understand how real cable systems are actually built out of these and other components such as optical fiber, since this introduces both technological and economic constraints on using cable to support other communication applications Although cable systems in the United States were built independently by a variety of cable companies and equipment providers, the infrastructure is similar enough from system to system so that we can talk about cable systems in general terms Much of what we need to understand is a matter of terminology used to describe different parts of the network CATV has always been considered a one-way transmission system, designed to deliver TV and packaged entertainment to the residential marketplace As the development of the architectures rolled out across the country, the CATV business, like other utility functions, became a monopoly The industry enjoyed the freedom to offer products and services packaged to serve a local community As a utility, the CATV companies were granted exclusivity There were few demands placed on the cable systems because the providers delivered a sufficient number of channels to the consumer based on the coaxial technology used The typical operator uses a 6 MHz channel capacity that is then filtered to prevent overlapping signals from interfering with other TV channels as shown in Figure 13-2 The channel filters then limit the overall capacity to approximately 42-45 MHz to carry the TV signal This is sufficient to deliver CATV broadcast quality signals to the consumers door for a fee

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As mentioned earlier, a self-tapping screw looks a lot like a wood screw, but the former is designed for metal and is the type of screw you see in common household electronic equipment The threads are coarse like a wood screw, but generally the taper of the screw changes at the end, becoming narrow quickly This allows the person assembling the item to start the screw easily in the pilot hole; then it becomes tighter as the screw cuts into the metal Many times, these screws have a hexagonal head for a nut driver and a slot for a screwdriver Longer versions are also tapered but have two indentations at the bottom to aid in cutting into the metal like a drill (thus the self-tapping moniker) These types of screws are not recommended for any type of combat robot BattleBot that takes a lot of vibration, especially if you have to remove and insert them several times

Figure 13-2: Coaxial channel capacities at 6 MHz In the event the operator runs out of capacity, new techniques exist to offer as many as three or four channels of TV on a single CATV 6 MHz capacity through the use of MPEG 2 standard compression With a three- to four-fold increase in the channel carrying capacity on the same cable, the operators find this rewarding This is especially true when the new MPEG standard allows the increased capacity without requiring the CATV operator to trench new fibers or coaxial cables throughout the neighborhoods

Once the cable is channeled into the current 6 MHz techniques with the bandpass filters allowing a 45 MHz capacity, the carriers use the sideband capacities for other operations 1 Filter guardbands (see Figure 13-3 ) can prevent two channels from interfering with each other

Rivets seem like a strong fastening method, and they really are They look great on airplanes and tanks, and even on robots When people finally decide to go the rivet route, there are questions about just how to install rivets Most builders finally decide to use the blind, or pop rivet But using these rivets is a major mistake, especially in combat robots Rivets, just like welds, are pretty permanent, making it hard, if not impossible, to change them in the field If you have to remove a pop rivet, it has to be drilled out leaving bits of steel or aluminum shavings hiding in the corners of your robot s chassis, ready to sneak into your electronics at the wrong moment Most pop rivets found in typical hardware stores are made of aluminum; and although basically permanent, they are about the weakest way to attach two pieces of metal They have poor shear strength, even the mild steel varieties When the rivet tool pulls on the pin to cause the rivet to deform and fill the hole, the pin breaks in half after the operation is over Even though a rivet holds two pieces of metal together, the other piece of the metal pin can come loose during