<br><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Prof P</b> <<a href="mailto:prof2x1@hotmail.com">prof2x1@hotmail.com</a>><br>Date: 2008/4/21<br>Subject: link sobre PLC e PLT no site da NATO<br>
To: <a href="mailto:ct2hmx@gmail.com">ct2hmx@gmail.com</a><br><br><br>
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Boas Hugo, vê e divulga este link interessante sobre interferências PLC e PLT no HF que descobri ontem no site da NATO:<br>
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<a href="http://www.rto.nato.int/search.asp#IST-050" target="_blank">http://www.rto.nato.int/search.asp#IST-050</a><br>
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73's<br>
Paulo Patrick<br>
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<td style="padding-right: 5px;">Maintenance of Military Posture; Collective Defence; Peace Support Operation; Situation Assessment; Expansion of Stability; Military Cooperation with WEU; </td></tr>
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<td valign="top"><b><img align="texttop" height="1" vspace="12" width="1">Covered Military Functions: </b></td>
<td style="padding-right: 5px;">Command & Control; Reconnaissance, Surveillance and Target Acquisition; Intelligence Support; Electronic Warfare; Joint & Combined Operations; Land Operations; Air Operations; Maritime Operations; </td>
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<td valign="top"><b><img align="texttop" height="1" vspace="12" width="1">Keywords: </b></td>
<td style="padding-right: 5px;">Power Line;PLT;PLC;HF Communications;Digital Subscriber Line (xDSL);COMINT;Reconnaissance;EMC</td></tr>
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<td valign="top"><b><img align="texttop" height="1" vspace="12" width="1">Leading RTO Panel: </b></td>
<td style="padding-right: 5px;">IST</td></tr>
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<td valign="top"><b><img align="texttop" height="1" vspace="12" width="1">In Coordination with: </b></td>
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<td valign="top"><b><img align="texttop" height="1" vspace="12" width="1">Partner Nations Invited? </b></td>
<td style="padding-right: 5px;"><img alt="Partner Nations invited" align="absmiddle"> </td></tr>
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<td valign="top"><b>Participating Nations <br>or Organisations: </b></td>
<td style="padding-right: 5px;" width="550"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Belgium" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Canada" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="France" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Georgia" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Germany" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Italy" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Norway" height="27" width="54"><img style="margin-bottom: 2px; margin-right: 2px;" alt="Slovak Republic" height="27" width="54"> </td>
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<td valign="top"><b>Leading Nation <br>or Organisation: </b></td>
<td><img alt="Canada" border="0" height="27" width="54"> </td></tr>
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<td valign="top"><img alt="More information!" align="absmiddle" height="21" hspace="5" width="21"><b>Additional Information: </b></td>
<td style="padding-right: 5px;" valign="center"><b>Topics: </b><br>Identify the effects of PLT and xDSL systems contributing to HF radio noise. Find out technical characteristics of PLT and xDSL systems that may be modelled as HF radio noise sources. Establish the corresponding models including procedures and tools for determination of the technical parameters describing the HF radio noise sources (power, antenna characteristic, gain). Determine these technical parameters theoretically and by measurement.
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<b>Background: </b><br>Power Line Tele-Communications (PLT, PLC) and various forms of Digital Subscriber Line (xDSL) transmissions are recent and rapidly evolving technologies using the existing electricity power or telephone lines for data transmission with rates higher than 1 MBit/s. As these lines were not designed for transmission of high data rates, they will produce noise-like 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 wire bound communication systems with respect to emission of radio noise in HF band. First measurements and estimations show that radio noise from PLT and xDSL will bring up big problems for military HF radio communications and Communication Intelligence (COMINT) in all NATO countries. HF is still and will be further used for near (ground wave) and far (sky wave) distance communications, as its equipment is easily and rapidly deployable. It permits fully military-controlled command links across long distances with secured transmissions without additional costs and easy frequency co-ordination.
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<b>Objectives: </b><br>The objective of this task group will be to find out procedures, models and tools for being able to calculate and measure radio noise produced by PLT and xDSL systems in HF range. This will then enable NATO and its countries to determine the threat to military HF radio communications and COMINT systems by PLT and xDSL and to take the appropriate steps.</td>
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