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#HC33S

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Fabian Kurz, DJ5CW/SO5CW<p>Time to catch up with <a href="https://social.darc.de/tags/hamchallenge" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamchallenge</span></a> - <a href="https://social.darc.de/tags/HC33S" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HC33S</span></a> (Build an antenna and make a contact with it): I replaced the Kelemen 40m/80m trap dipole at SO5CW with two parallel dipoles for 40m and 80m with a common feed point. I pre-tuned the 40m dipole to resonance at 7025 kHz and after adding the 80m dipole, I had to shorten the 40m dipole a bit because the resonance slipped down a bit below the band edge. Yesterday I did not have much time but made two QSOs with it on 80m and 40m. <span class="h-card" translate="no"><a href="https://mas.to/@hamchallenge" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>hamchallenge</span></a></span> <a href="https://social.darc.de/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a></p>
Michael K Johnson<p><span class="h-card" translate="no"><a href="https://mas.to/@hamchallenge" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>hamchallenge</span></a></span> Apparently this was also an ahead-of-schedule <a href="https://social.makerforums.info/tags/HamChallenge" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HamChallenge</span></a> <a href="https://social.makerforums.info/tags/HC33S" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HC33S</span></a> </p><p>I built a six-band linked dipole with links for 10m, 12m, 15m, 17m, 20m, 30m, and 40m meant for inverted-V deployment, to be an efficient, mostly isotropic radiator with high Q on one band (at a time). I want to be able to POTA with friends, but we tend to desense each other, so I'm trying for more band isolation as one tool in the toolkit.</p><p>My toolkit for isolating now includes:</p><ul><li>Roofing filters in the KX3 (but not in the IC-7300, sadly)</li><li>A 100' coax extension to move at least one antenna to keep them out of each others' near fields</li><li>External QRP bandpass filters for the KX3 (but haven't built 100W capable bandpass filters for the IC-7300 yet)</li><li>Polarization separation via loaded JPC-12 and JPC-7 antennas (with relatively low Q)</li><li>Higher Q in this linked dipole</li><li>A dual-tapped QRP 9:1/49:1 unun to let me move either an EFHW or EFRW away from my KX3</li><li>A 49:1 unun to let me move an EFHW away from my IC-7300</li></ul><p>Because I expect to operate QRP mostly on CW, I tuned the links for the low ends of the bands. I started by tuning 10m, then added one set of slightly-too-long links at a time, hoisting it on a mast to measure with a NanoVNA, and trimmed the ends evenly to move resonance up only as far as I wanted.</p><p>I used 2mm bullet/banana connectors to connect the links, and lightweight static line for the links, so that they would be flexible and be able to wrap up on a winder.</p><p>I chose the size of the winder to be able to hold a 40m dipole with thin wire, and to be able to hold FT82, FT140, or FT240 toroids for common-mode so that it can be realized for any desired power level from QRP, to barefoot 100W, and beyond.</p><p>I chose RG316 for the balun/choke because of its PTFE dielectric that can take a tight radius bend, and used that for the entire feed from the radio.</p><p>I designed the winder to be small. My next linked dipole will use Vectran-core DX-WIRE UL, and I'll modify the design slightly.</p>
Richard<p>Let&#39;s try a 10fer for <span class="h-card" translate="no"><a href="https://mas.to/@hamchallenge" class="u-url mention">@<span>hamchallenge</span></a></span> : :alex_crazy: </p><p>I went out today for POTA RO-0109 <a href="https://mastodon.radio/tags/HC29S" class="mention hashtag" rel="tag">#<span>HC29S</span></a> in front of this communist mammoth <a href="https://mastodon.radio/tags/HC13S" class="mention hashtag" rel="tag">#<span>HC13S</span></a>, operated all day on 36Ah <a href="https://mastodon.radio/tags/HC36S" class="mention hashtag" rel="tag">#<span>HC36S</span></a> (ha!). I worked one DX, the ITU HQ, out of today&#39;s DXpeds PJ4M, VP8DPD and V73MT <a href="https://mastodon.radio/tags/HC07S" class="mention hashtag" rel="tag">#<span>HC07S</span></a>, 14 DXCCs <a href="https://mastodon.radio/tags/HC37s" class="mention hashtag" rel="tag">#<span>HC37s</span></a>, plus all xOTA <a href="https://mastodon.radio/tags/HC16S" class="mention hashtag" rel="tag">#<span>HC16S</span></a> I heard. I had 20 contacts on CW <a href="https://mastodon.radio/tags/HC38S" class="mention hashtag" rel="tag">#<span>HC38S</span></a> including <span class="h-card" translate="no"><a href="https://mastodon.radio/@YO3AX" class="u-url mention">@<span>YO3AX</span></a></span> and <span class="h-card" translate="no"><a href="https://mastodon.radio/@G0TRT" class="u-url mention">@<span>G0TRT</span></a></span>. I even heard F4JRC on 6m <a href="https://mastodon.radio/tags/HC28S" class="mention hashtag" rel="tag">#<span>HC28S</span></a>. I fixed my audio card <a href="https://mastodon.radio/tags/HC45S" class="mention hashtag" rel="tag">#<span>HC45S</span></a> and used the antenna I built with the YL <a href="https://mastodon.radio/tags/HC33S" class="mention hashtag" rel="tag">#<span>HC33S</span></a>.</p><p>Details follow.</p>
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