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antennas and, to some extent, larger equipment Higher frequencies dictate smaller antennas and equipment, but need more power (which also means more equipment) to go the same distance Still another is that the distance covered by radio communications varies with the frequency and with the weather at least the weather at very high altitudes, in the ionosphere something for which we have no known control These factors and the general behavior of radio signals at different frequencies are fairly well known and tend to dictate classes of service or application-specific uses for the different frequencies We use some of these limitations to our advantage when figuring out what part of the radio spectrum is best for what we intend to communicate over it, and where we want it to go For this reason, for example, cellular telephones that have to communicate only a mile or two to a nearby base station can use low power at very high frequencies And those frequencies can be reused over and over again in other cells nearby You would not use a huge radio with a 200-foot long antenna for something like cellular telephones, as the idea of portable brings up visions of trucks and trailers full of equipment We know a cellular telephone-type radio cannot broadcast very far, but a larger radio and antenna at a lower frequency can, so we use those parts of the radio spectrum for long-distance communication around the Earth What we find is that some of the radio spectrum is reusable or can be used simultaneously by separating its reuse to areas beyond the range it normally covers, and we have been doing that for years For instance, 1070 KHz AM broadcast radio stations exist in only three to four different parts of the United States, while perhaps 20 or 30 1013 MHz FM broadcast stations exist in the same larger geographical area And there are more in other countries, just as there are multiple Channel 3 or Channel 21 television stations around the world Because we know how most radio waves and the ionosphere behave, and we have learned how to design antennas to shape the pattern the radio signals emit, we can tailor the amount and direction of signal An FM radio signal, for instance, does not need to broadcast to the stars, so the antenna pattern is tailored to place that signal down into the local listening area and not much beyond the primary area of interest Doing this, we can cellularize radio frequency reuse around the country and around the world One of the enemies of reuse is boosting the power to get a signal just a little bit
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farther out there And in doing so, we may infringe on someone else s territory, causing interference The frequency, direction (or focus), and the power of various radio signals is, thus, regulated to avoid interference between users This is a very important consideration when dealing with a limited resource, and a resource that has limitations on how much of it we can practically use Cellular phone service has or had only 40 to 50 800 to 900 MHzrange channels to share, and there are thousands of phone cells throughout the country We also anticipate there are, or will be, millions of wireless networking devices using 24 or 5 GHz spectrum all over the world and perhaps several hundred of them within 1 to 5 miles of yours Above 2 to 5 GHz, it becomes impractical to use radio spectrum for anything but point-to-point communications satellites, microwave hops from place to place, etc We do not want to use 10 GHz radios for personal communications devices because water resonates near that frequency and a high percentage of human mass is water make a phone call, boil your brain So, we have learned since the days of Marconi how different parts of the radio spectrum behave, how the atmosphere behaves, how to control the power levels, and how to tailor antennas to focus and optimize signals to specific areas, with the result that we can reuse the same frequencies many times in different areas of the world What we have not been able to do is make more radio units available; thus we have to work out better sharing arrangements or repurpose some of the spectrum we have been using if we want to do more or different things As good (as in beneficial to us and financially successful to the manufacturers) as the implementation of 80211a and 80211b have been so far in the limited amount of spectrum allotted to them, there is speculation and investigation into broadening the use of radio for data networks, and, of course, which part of the greater radio spectrum can be used for it While computer networking looks to expand, so do police and fire and other types of communications, causing a major reshuffling of television channels and a push to digital TV broadcasts that can use more of the original television space for more and different radio uses The US Federal Communications Commission (FCC) has begun a new Spectrum Policy Task Force (http://wwwfccgov/sptf) to study the current and future demands of radio spectrum use, leading to possible changes in who uses what parts of the spectrum and how
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