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www.southgatearc.org
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IEEE Article on BPL / PLTThe November 2008 issue of the IEEE Communications magazine carries an article on the potential effects of broadband wireline telecommunications on the HF spectrum. A number of companies now sell products that transmit a broadband HF radio signal over the electric mains power supply. Such products can not only cause severe interference to the reception of broadcast radio stations they can also impact on the military users in this key part of the radio spectrum potentially jeopardizing Homeland Security. The IEEE abstract of the article reads: Power line telecommunications and various forms of digital subscriber line transmissions are recent and rapidly evolving technologies using the existing electricity power or telephone lines for data transmission at rates higher than 1 Mb/s. As these lines were not designed for transmission of high data rates, they produce noiselike interferences in the HF range. The intensity depends on the electrical characteristics of the lines (balance, match, screening) as well as on the density and area coverage of these new systems. Exact calculations are impossible at this time because of missing models for the new wirebound communication systems with respect to emission of radio noise in the HF band. Early measurements and estimations showed that radio noise from PLT and xDSL has the potential to cause problems for military HF radio communications and communication intelligence. A Research Task Group under NATO was assigned to study the issue and determine possible solutions. Briefly, the findings of the RTG do indicate that PLT emissions have the potential to cause appreciable degradation in the exploitation of the HF spectrum by military users. The article is available to IEEE members or can be purchased from http://ieeexplore.ieee.org/xpl/freeabs_all.jsp
Related URL's Video - Shortwave Radio and Power Line Transmissions (UKQRM) UKQRM
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