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	<title>NØUN&#039;s Ham Radio Blog &#187; lights</title>
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	<link>http://www.n0un.net</link>
	<description>My Ham Radio Experience Through the Years</description>
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		<title>DXCC and Canceling Line Noise</title>
		<link>http://www.n0un.net/2009/12/dxcc-canceling-line-noise/</link>
		<comments>http://www.n0un.net/2009/12/dxcc-canceling-line-noise/#comments</comments>
		<pubDate>Sun, 06 Dec 2009 06:58:39 +0000</pubDate>
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				<category><![CDATA[N&#216;UN Blog Posts]]></category>
		<category><![CDATA[cancel]]></category>
		<category><![CDATA[christmas]]></category>
		<category><![CDATA[lights]]></category>
		<category><![CDATA[line noise]]></category>
		<category><![CDATA[mfj 1026]]></category>
		<category><![CDATA[power line noise]]></category>
		<category><![CDATA[qrm]]></category>
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		<guid isPermaLink="false">http://www.n0un.net/?p=308</guid>
		<description><![CDATA[A couple items of note&#8230; I snagged a couple new countries in my quest for DXCC Honor Roll in the last few weeks/month. OYØ (Faroe Island), 9Q (Democratic Republic of Congo), SV9 (Crete), EK (Armenia), 8Q (Maldives), FO (Austral Island) and finally FO (Marquesas Island). I&#8217;ve probably worked a few of these DXCC countries several [...]]]></description>
			<content:encoded><![CDATA[<p style="text-align: justify;">A couple items of note&#8230;</p>
<p style="text-align: justify;">I snagged a couple new countries in my quest for DXCC Honor Roll in the last few weeks/month. OYØ (Faroe Island), 9Q (Democratic Republic of Congo), SV9 (Crete), EK (Armenia), 8Q (Maldives), FO (Austral Island) and finally FO (Marquesas Island). I&#8217;ve probably worked a few of these DXCC countries several times over through the years, but I never received a QSL so we&#8217;ll just keep working until we confirm them, then we&#8217;ll keep working them well after too! That&#8217;s the fun of chasing DX <em><strong>and</strong></em> the the heartbreak of losing my old hard drive where I had thousands and thousands of contacts logged, but not backed up. Oh well, I still have all my QSL cards&#8230;</p>
<p style="text-align: justify;">With these 7, that brings my total DXCC Countries worked to 300 with 293 confirmed. Only 38 more to go.</p>
<p style="text-align: justify;">At this rate it may take me another 35 years to get them all!</p>
<p style="text-align: justify;">In other news, I&#8217;ve really been having a rough time with line noise &#8220;interference&#8221;. Between the neighbors Christmas light displays, low sunspot numbers and a constantly freezing/thawing power transformer out back, it&#8217;s been making it tougher than usual to hear DX. And if you can&#8217;t <em>hear</em> DX, you can&#8217;t <em>work</em> DX.</p>
<p style="text-align: justify;">I bought a MFJ 1026 Noise Canceling Signal Enhancer on eBay to assist with the noise and I have to say, once I figured it out (then got lucky with a noise antenna), it has helped tremendously. I was just about ready to give up on the damn thing, then I got lucky.</p>
<p style="text-align: justify;">The principle behind the noise canceler is to hear the &#8220;noise&#8221; on a secondary antenna, then the unit can place the noise 180 degrees out of phase from the main receiving antenna &#8211; thus cancelling the noise but not the signals being received. The problem I was having with it was I couldn&#8217;t get a secondary receive antenna to &#8220;hear&#8221; the noise. <strong>It can&#8217;t cancel something it can&#8217;t hear.</strong> I tried UHF/VHF TV antennas, wires wrapped around the shack, the whip that&#8217;s supplied with the 1026 and even a couple lame-ass attempts at building an &#8220;indoor&#8221; directional noise antenna from coat hangers and odds &amp; ends I had laying around the shack &#8211; no luck. I was just about to package the damn thing up and send it back &#8211; that&#8217;s when I got lucky.</p>
<p style="text-align: justify;">I had a 144 MHZ BNC rubber duck whip laying around that hadn&#8217;t been used in 20 years that I wanted to try on the noise, but I didn&#8217;t have a way to connect it to the MFJ 1026 RCA or 239 coax connectors so I stopped in at a local Radio Shack and was checking out the BNC to coax adapters when I saw a $20 telescoping whip antenna with a BNC connector on it. Hmmmm. I figured I&#8217;d try the rubber duck first then as a last resort, try the 27 MHZ adjustable whip. I threw it in my bag with the adapters and bee-lined it home.</p>
<p style="text-align: justify;">I never got to try the rubber whip. I installed the pre-amp jumper in the MFJ 1026 to the external antenna position, plugged the 27 MHZ telescoping antenna in, raised it and there it was &#8211; line noise on the secondary receive antenna! After a couple of &#8220;learning&#8221; passes on how to null the noise, it works perfectly. S-7 line noise completely wiped out without affecting the DX signals. Magic.</p>
<p style="text-align: justify;">Anyway, enough rambling for now. I&#8217;m hungry.</p>
<p style="text-align: justify;">I&#8217;ll post a couple .wav files soon with actual results of the noise canceller at work. It is amazing once you figure it out, and it&#8217;s much better than the noise &#8220;blanker&#8221; on the FT-990 because it doesn&#8217;t distort/overload or drag in loud signals close by.</p>
<p style="text-align: justify;">More to come, 73 for now</p>
<p style="text-align: justify;">NØUN</p>

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