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<H1 align=left><FONT size=6><FONT style="BACKGROUND-COLOR: #ffffff" face=Impact
color=#000000>... <FONT size=5>PELA SAÚDE DA ONDA CURTA
</FONT>...</FONT></FONT></H1>
<H1 align=left><STRONG><FONT face=Tahoma color=#ff0000><FONT size=7><FONT
face="Comic Sans MS"><IMG class="fwEmotion fwSizeFixed"
src="http://images.webs.com/Images/Smilies/Round/exclamation.gif"><FONT
size=6>PLC</FONT><IMG class="fwEmotion fwSizeFixed"
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class="fwEmotion fwSizeFixed"
src="http://images.webs.com/Images/Smilies/Round/question.gif"></FONT>, NÃO,
<FONT size=6>OBRIGADO
!!!</FONT></FONT></FONT></STRONG></H1></FONT></FONT></FONT></STRONG>
<H1>IARU: Powerline Communications</H1>
<P><FONT face=Verdana>Powerline Communications (PLC, PLT, BPL) can wreak havoc
to radio reception. An International Amateur Radio Union (IARU) report to the
ITU-R states the minimum level of protection that radio communications need from
these polluting systems.</FONT></P>
<P><FONT face=Verdana>From </FONT><A
href="http://www.arrl.org/news/forthcoming-iaru-activities-at-the-itu"
target=_blank><FONT
face=Verdana>http://www.arrl.org/news/forthcoming-iaru-activities-at-the-itu</FONT></A></P>
<P><FONT face=Verdana>Working Parties 1A and 1B of the International
Telecommunication Union’s (ITU) Study Group 1 will meet in Geneva from June
21-28. </FONT></P>
<P><FONT face=Verdana>A major item of discussion will be protection of radio
services from interference from Broadband over Powerline (BPL), called Power
Line Communications (PLC or PLT) in Europe. </FONT></P>
<P><FONT face=Verdana>The International Amateur Radio Union (IARU) has already
contributed to the ITU-R report SM2158, Impact of Power Line Telecommunication
Systems on Radiocommunication Systems Operating in the LF, MF, HF and VHF bands
below 80 MHz. This report shows the acceptable criteria for degradation of the
HF radio noise floor caused by BPL is defined as being 0.5dB. Work in WP1A will
concentrate on the protection of radio services from the effects of BPL in range
from 80-200MHz.</FONT></P>
<P><FONT face=Verdana>The IARU delegate to Study Group 1 and its working parties
is <STRONG>Peter Chadwick, G3RZP</STRONG>. One of items Chadwick has prepared
for these meetings is a report on the effects of intermodulation in power
supplies causing the amateur band frequency notches in the BPL spectrum to be
degraded. <BR>This report has been prepared from the work by <STRONG>Richard
Marshall, G3SBA</STRONG>, published in the RSGB’s member journal RadCom, and
also points out the difficulty such effects could have on the BPL system
itself.</FONT></P>
<P><FONT face=Verdana>Chadwick will also present protection criteria for those
amateur stations operating in the 2 meter band. Chadwick, who along with
<STRONG>Ian White, GM3SEK</STRONG>, helped prepare the criteria, said it is
considered that the Amateur and Amateur Satellite Services require protection
such that BPL interference does not exceed -45dBmV/m in the main lobe of the
antenna, with a separation between antenna and the BPL installation being at
least 10 meters.</FONT></P>
<P><FONT face=Verdana>Chadwick said that there are a number of non-amateur
services that could suffer interference from BPL or its harmonics, such as
applications including social alarms for the elderly, pagers and medical implant
telemetry, as well as broadcast services, and when aggregation of radiation is
concerned, aircraft navigation and communications: “When the differences in
range between BPL and mains leads and the social alarms and medical implant
‘base’ stations and the like are taken into account, the acceptable levels of
radiation to protect the Amateur Service are of the same order as those needed
to protect these other services.”</FONT></P>
<P><FONT face=Verdana>Read the report - Impact of power line telecommunication
systems on radiocommunication systems operating in the LF, MF, HF and VHF bands
below 80 MHz<BR></FONT><A href="http://www.itu.int/publ/R-REP-SM.2158-2009/en"
target=_blank><FONT
face=Verdana>http://www.itu.int/publ/R-REP-SM.2158-2009/en</FONT></A></P>
<P><FONT face=Verdana>G.hn home network standard approved<BR></FONT><A
href="http://www.southgatearc.org/news/june2010/g_hn_home_networking_standard_approved.htm"
target=_blank><FONT
face=Verdana>http://www.southgatearc.org/news/june2010/g_hn_home_networking_standard_approved.htm</FONT></A></P>
<P><FONT face=Verdana><STRONG>UKQRM</STRONG> is a group fighting radio
interference caused by Powerline communications (PLC, PLT, PLA, BPL)
</FONT><A href="http://www.ukqrm.org/" target=_blank><FONT
face=Verdana>http://www.ukqrm.org/</FONT></A><BR><BR></P></BODY></HTML>