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<div dir="ltr" data-setdir="false"><div><p class="ydpbc36f1a2MsoNormal">Willie –</p>
<p class="ydpbc36f1a2MsoNormal">Mike has covered this very well.<span> </span>Here are a couple additional ideas.<span> </span>The ends of the antenna can droop down the
side of your house and it will still work OK.</p>
<p class="ydpbc36f1a2MsoNormal">If you cut the wires long, say 35 feet, you can loop each wire
end back on itself.<span> </span>The loop back
portion will not radiate. <span> </span>This way you
won’t need to solder a foot of wire to the existing length to get a 40 meter
resonance (low vswr).</p>
<p class="ydpbc36f1a2MsoNormal">Feeding the same center insulator with 16 foot wires is a
good way to get 20 meters.<span> </span>If you do
this you should try to angle the wires away from the 40 meter wires.<span> </span>This will reduce interaction between the two
antennas.<span> </span>Interaction can cause the
resonance frequency to shift in both antennas.</p>
<p class="ydpbc36f1a2MsoNormal">A vswr meter will be useful.</p>
<div>de K1VK</div></div><br></div><div><br></div>
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On Friday, September 4, 2020, 09:03:54 AM EDT, Mike Raisbeck via bars <bars@w1hh.org> wrote:
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<div> <font size="2">Hi Willie,</font></div>
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<div><font size="2">A couple of observations:</font></div>
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<div><font size="2">1 - it doesn't need to be super straight. any angle greater than 60 should do it.</font></div>
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<div><font size="2">2 - if you have choices on which point can be the highest, go for the center. The center portion of the dipole carries most of the current, so the higher the better.</font><br clear="none">
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<div><font size="2">3 - shoot for the middle of the band - it's a squeeze, but you might get most or all of the band at less than 2:1 SWR. If you have a tuner on your rig, it hardly matters at this fequency<br clear="none">
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<div><font size="2">4 - depending on where your coax enters the house, you have the opportunity to base feed the whole thing as an 80m vertical</font></div>
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<div><font size="2">5 - might as well have a 20m dipole on the same feed points as well. That way you get 20. Though the SWR may be a bit over 2:1, you will get 15m as well.</font></div>
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<div style="font-family:arial, helvetica;font-size:10pt;color:black;">-----Original Message-----<br clear="none">
From: William Smith <w_smith@compusmiths.com><br clear="none">
To: bars@w1hh.org<br clear="none">
Sent: Thu, Sep 3, 2020 7:11 pm<br clear="none">
Subject: [bars] 40M Dipole?<br clear="none">
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<div class="ydpa7c62304yiv1156574383yqt4154814913" id="ydpa7c62304yiv1156574383yqt46558"><div id="ydpa7c62304yiv1156574383">
<div>Hi All,
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">As I mentioned last night during the Zoom meeting, I'm looking at building a 40M dipole out of some wire, insulators, and an SO-239 connector, using essentially the instructions at:</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383"><a shape="rect" class="ydpa7c62304yiv1156574383" href="https://dcasler.com/2011/02/17/ham-radio-40-meter-dipole-your-first-antenna/" rel="nofollow" target="_blank">https://dcasler.com/2011/02/17/ham-radio-40-meter-dipole-your-first-antenna/</a></div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">I'm hoping to stretch it out across the roof peak of my house, which has lots of space:</div>
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<div class="ydpa7c62304yiv1156574383"><img class="ydpa7c62304yiv1156574383" id="ydpa7c62304yiv1156574383B7903C8-1BD5-48EE-9ECB-A083B8FE7451" src="cid:45dHDk1VwfDfpucIyeK5" data-inlineimagemanipulating="true" style="width: 727px; max-width: 747px;"></div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">The ridge of the larger side is 40 feet, and the smaller side is 25 feet, so 66 feet ought to be do-able.</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">I have a couple of questions for the experts:</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">1) Does it make much difference if the antenna is straight? I might do something like:</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383"><img class="ydpa7c62304yiv1156574383" id="ydpa7c62304yiv1156574383A4CF11FB-E719-41F3-AF9A-8B379F015EB9" src="cid:MaosfbrVnsKOUbPzroZF" data-inlineimagemanipulating="true" style="width: 567px; max-width: 747px;"></div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">To stay away from the ridgelines, where I know there's a lot of wiring (the point of the "Vee" is where I have a couple of antenna poles.)</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">2) Obviously I want to start out long and shorten the wires, so as to avoid the "I cut it three times and it's still too short!" problem, but I'm not sure if I have to cut the (insulated) wire at the ends, or if I can wrap it back around itself (which would allow me to lengthen it if I overshoot).</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">3) Should I aim for one end of the band or the middle? Or is it going to be pretty good throughout the band?</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">Is there anything else I should know before I start?</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">Many thanks in advance!</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">73,</div>
<div class="ydpa7c62304yiv1156574383"><br clear="none" class="ydpa7c62304yiv1156574383"></div>
<div class="ydpa7c62304yiv1156574383">Willie</div>
<div class="ydpa7c62304yiv1156574383">N1JBJ</div>
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