1、QUESTION ITU-R 230-1/3*Prediction methods and models applicable to power linetelecommunications systems(2005-2009)The ITU Radiocommunication Assembly,consideringa) that power line telecommunications systems (PLT) and other wired telecommunicationsystems may use base-band frequencies up to 80 MHz, an
2、d that a wide variety of PLT architecturesand components will be present, even in one administrative jurisdiction;b) that radio-frequency energy will be radiated by a number of mechanisms and in severalmodes, particularly from unbalanced, variable impedance and poorly terminated lines,decides that t
3、he following Questions should be studied1 What are the mechanisms that cause radio-frequency radiation from PLT systems and howcan they be modelled? What are the salient features of the topology (ground plane location, spatialdistribution, etc.) that are most important for accurate estimation of emi
4、ssions?2 What techniques are most appropriate in aggregating the total radiated energy in space fromsuch a system or multitude of systems?3 Which signal level propagation models are most appropriate in the determination ofinterference?4 What advice may be given to enable practical measurement of rad
5、iating fields at shortdistances (within the near field)?further decides1 that appropriate information shall be included in a Recommendation or a Handbook;2 that the above studies should be completed by 2012.Category: S2_* This Question should be brought to the attention of Radiocommunication Study Group 1(Working Party 1A).
