<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE></TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.3314" name=GENERATOR></HEAD>
<BODY><!-- Converted from text/plain format -->
<DIV><FONT face=Arial><A 
href="http://images.google.pt/imgres?imgurl=http://www.vibeng.com/images/roomLayout.png&amp;imgrefurl=http://www.vibeng.com/cancellation.htm&amp;h=238&amp;w=290&amp;sz=48&amp;hl=pt-PT&amp;start=7&amp;tbnid=WQwyIPQmOXenfM:&amp;tbnh=94&amp;tbnw=115&amp;prev=/images%3Fq%3DINTERFERENCE%2BCANCELLING%2BSYSTEM%2B%26gbv%3D2%26hl%3Dpt-PT%26sa%3DG"><IMG 
style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; WIDTH: 159px; BORDER-BOTTOM: 1px solid; HEIGHT: 132px" 
height=94 
src="http://tbn0.google.com/images?q=tbn:WQwyIPQmOXenfM:http://www.vibeng.com/images/roomLayout.png" 
width=115></A><IMG 
style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; BORDER-BOTTOM: 1px solid" 
height=129 
src="http://tbn0.google.com/images?q=tbn:v29kXe9-JXgQNM:http://static.howstuffworks.com/gif/noise-canceling-headphone-6.jpg" 
width=124><A 
href="http://images.google.pt/imgres?imgurl=http://user.netonecom.net/~swordman/Radio/graphics/noise_cancel_diag.gif&amp;imgrefurl=http://catzco.com/Favorites.htm&amp;h=1144&amp;w=1543&amp;sz=69&amp;hl=pt-PT&amp;start=1&amp;tbnid=xw3YktIIezS3oM:&amp;tbnh=111&amp;tbnw=150&amp;prev=/images%3Fq%3DLloyd%2BButler%2BVK5BR%2BINTERFERENCE%2BCANCELLING%2BSYSTEM%2B%26gbv%3D2%26hl%3Dpt-PT%26sa%3DG"><IMG 
style="BORDER-RIGHT: 1px solid; BORDER-TOP: 1px solid; BORDER-LEFT: 1px solid; WIDTH: 152px; BORDER-BOTTOM: 1px solid; HEIGHT: 128px" 
height=111 
src="http://tbn0.google.com/images?q=tbn:xw3YktIIezS3oM:http://user.netonecom.net/~swordman/Radio/graphics/noise_cancel_diag.gif" 
width=150></A></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT face=Verdana size=5>Noise 
<B>cancelling</B> phasing circuit</FONT></FONT><FONT face=Verdana 
size=5>s.</FONT></FONT></DIV>
<DIV>
<H1>Simple circuit to beat receiver interference </H1>
<P><FONT face=Verdana><STRONG>VU2ATN</STRONG> had been experiencing severe 
problems in HF operation owing to continuous interference from passenger lifts 
and various power appliances in his QTH which is a part of a large apartment 
block. </FONT></P>
<P><FONT face=Verdana>In fact Atanu <STRONG>had even considered giving 
up</STRONG> ham radio because he had not been able to copy signals with signal 
strength less than +9.</FONT></P>
<P><FONT face=Verdana>What to do?<BR><BR>Well he found an article "AN 
INTERFERENCE CANCELLING SYSTEM FOR YOUR RECEIVER OR TRANSCEIVER" by Lloyd Butler 
VK5BR on the internet and decided to try the solution.</FONT></P>
<P><FONT face=Verdana>The result?</FONT></P>
<P><FONT face=Verdana>Very encouraging and the cancelling system, using a simple 
circuit and a noise antenna, has been working pretty well. </FONT></P>
<P><FONT face=Verdana>Atuna, VU2ATN can reiterate that VK5BR's solution is 
really very good and can certainly be copied by city-dwellers like him and still 
pursue ham radio.<BR></FONT></P>
<P><FONT face=Verdana>You can read Lloyd VK5BR's article by clicking </FONT><A 
href="http://users.tpg.com.au/users/ldbutler/NoiseCancelling.htm" 
target=_blank><FONT face=Verdana>here</FONT></A><FONT face=Verdana> </FONT></P>
<P><FONT face=Verdana>Fonte: </FONT><A href="http://www.wia.org.au/" 
target=_blank><FONT face=Verdana>Wireless Institute of 
Australia</FONT></A></P></DIV></BODY></HTML>