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<!DOCTYPE html>
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<a href="/transmissionlines/atu/qrp-antenna-tuner/" rel="bookmark">
QRP Antenna Tuner
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<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
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DIY kit from Aliexpress or Ebay Thse kits are sold on Aliexpress and Ebay and at the time of wiring they cost about $13 USD shipped.
Roots of this tuner can be traced to a QRP console designed by Doug DeMaw featured in QST article: “A QRP Console” Doug DeMaw, QST, Sept. 1970, p. 23-25.
SWR indicator used in this tuner is based on Dan Tayloe design:
SWR Indicator Bridge Kit N7VE LED SWR Bridge Manual LED SWR Schematic Tuner is using a high-pass T-network to match low input impedance (Z) to a high output Z.
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<a class="list__footer-readmore btn" href="/transmissionlines/atu/qrp-antenna-tuner/">Read more…</a>
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Zen and Art of Radiotelegraphy Book
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<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2020-02-25T18:47:06-05:00">February 25, 2020</time>
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Free book by Carlo Consoli, IK0YGJ ZEN AND THE ART OF RADIOTELEGRAPHY
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</article><article class="list__item post">
<header class="list__header">
<h3 class="list__title post__title ">
<a href="/antennas/qrp-40-10-ununtenna-ali/" rel="bookmark">
QRP 40m-10m UnUnTenna
</a>
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<svg class="meta__icon icon icon-time" width="16" height="14" viewBox="0 0 30 28"><path d="M15 0C7 0 1 6 1 14s6 14 14 14 14-6 14-14S23 0 15 0zm0 25C9 25 4 20 4 14S9 3 15 3s11 5 11 11-5 11-11 11zm1-18h-2v8.4l6.8 4.4L22 18l-6-3.8V7z"/></svg>
<time class="meta__text" datetime="2020-02-22T07:48:27-05:00">February 22, 2020</time>
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40m-10m UnUnTenna Kit from Aliexpress These kits are sold on Aliexpress and Ebay and at the time of wiring they are about $15.35 USD shipped.
QRPGuys 40m-10m UnUnTenna
</div>
</article><article class="list__item post">
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<a href="/logger/cqrlog/" rel="bookmark">
Cqrlog
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<time class="meta__text" datetime="2020-02-17T20:51:28-05:00">February 17, 2020</time>
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CQRLOG
GUI logger app build with Lazarus and FreePascal. Primary platform: Linux + MySQL.
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Tlf Logger
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<time class="meta__text" datetime="2020-02-12T21:28:31-05:00">February 12, 2020</time>
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<div class="content list__excerpt post__content clearfix">
TLF a Linux based ham radio contest logger TLF is a curses based console mode general logging and contest program for amateur radio:
https://tlf.github.io/
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