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11 Cable Television History
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Cable television systems were rst developed to improve television service to people living in remote areas where the off-air signal, or reception, was poor Television broadcasting stations looked on this new industry as an ally in expanding their market area Even today local broadcast stations are a major source of local news, weather, and sports to the viewing American public, and cable television still carries local television broadcast stations as part of its channel lineup Of course, the problem with reception for many television broadcast stations has not disappeared Transmitted power output as stated in the station licenses has not changed The location of the station transmitting antenna towers and antennas, in most cases, has not changed The point is, the off-air reception problem remains, and therefore many subscribers still connect to the cable television system because it carries local television broadcasting stations Many early cable television systems were required as part of their license, charter, or franchise to provide locally originated programs, providing another service to the subscriber for local news, weather, and sports Many families were able to watch their children participate in school sports programs televised by the local cable company, shows available only to subscribers Cable operators looked upon their locally originated cable channel as a horrible problem and large expense, though some became successful enough to sell local advertising spots to offset production costs
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Introduction to Cable Communications Systems
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Today, the cable television industry is facing much competition for the viewing public s attention Analysis of the facts tells us that a family that has a direct satellite broadcast system (DBS) or some other satellite service has to have some kind of rooftop antenna or the usual rabbit-ear antenna to provide the local television off-air broadcasts Many new housing developments and planned communities prohibit backyard dishes and/or rooftop antennas These are additional reasons for the viewing public to remain on a cable television system We, the cable operators, must never forget these facts
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111 The Television Reception Problem
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The reception problem of off-air television broadcast stations remains; it has not simply disappeared with technical progress Of course, the television set itself has been improved signi cantly The development of solidstate components and the manufacture of printed circuits allowed sets to run cooler, thus prolonging their lives Tuner circuits have improved signal-to-noise ratios, and the mechanical switch has been replaced by push-button digital switches Remote controls have helped to make couch potatoes of many people Large screens and improved sound have made modern television sets an important source of home entertainment 1111 Cable television is the major source of television programming in remote areas Such areas often have a sparse population, so subscriber numbers are usually small Cable systems serving such areas provide a very useful service and have to charge subscribers accordingly Since the path loss of signal between the television transmitter and receiver is a function of distance and frequency, these areas receive weak television signals 1112 Terrain also affects signal levels Mountainous areas cause problems with reception in many parts of the United States It s no surprise, then, that the rst cable television systems were started in this region People living in the valleys, where most of the towns were concentrated, had major problems with television reception Essentially, these locations were out of the eld strength path as projected by the transmitting sites In many instances, homes that were fairly close to the transmitter were nearly completely shielded by a mountain in between Cable systems serving these areas enjoyed a high penetration of television service
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1113 Urban residents also have television reception problems Tall buildings and skyscrapers are similar to mountains in that they shield many apartment dwellers from good quality television reception In many instances television signals are re ected off some of the surrounding buildings, causing severe television picture impairment called multipath reception Multipath reception can be so severe that within the same home, the signal can be unwatchable for one channel and satisfactory for another Such multipath problems are illustrated in Figure 1-1
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