https://wiki.jetvision.de/index.php?action=history&feed=atom&title=Accessories%3AG7RGQ_Omni_Directiona_Antenna 2026-06-02T21:05:05Z Revision history for this page on the wiki MediaWiki 1.42.1 https://wiki.jetvision.de/index.php?title=Accessories:G7RGQ_Omni_Directiona_Antenna&diff=2738&oldid=prev 2013-11-10T18:36:46Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 18:36, 10 November 2013</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>For a long time, until I got the russian wonder, I was using this [http://www.kineticavionics.co.uk/forums/viewtopic.php?f=1&amp;t=7489&amp;sid=a97d41478e66511dd5cf715ee7c88df0&amp;start=24 antenna] but with quarter wavelength radials only. Don't know what the author hopes to gain from longer ones, within 30 years of ham radio life I never saw radials different to half wavelength. I have measured one on a network analyzer. If you leave the antenna rod in free space (as in the picture below), make the top section about <del style="font-weight: bold; text-decoration: none;">2mm </del>longer, if you put a <del style="font-weight: bold; text-decoration: none;">20mm </del>plastic tube over it, shorten the top section by 5mm. I do not know the influence of a wide diameter (<del style="font-weight: bold; text-decoration: none;">50mm </del>- <del style="font-weight: bold; text-decoration: none;">100mm</del>) plastic tube, maybe this is then just matching the given length.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>For a long time, until I got the russian wonder, I was using this [http://www.kineticavionics.co.uk/forums/viewtopic.php?f=1&amp;t=7489&amp;sid=a97d41478e66511dd5cf715ee7c88df0&amp;start=24 antenna] but with quarter wavelength radials only. Don't know what the author hopes to gain from longer ones, within 30 years of ham radio life I never saw radials different to half wavelength. I have measured one on a network analyzer. If you leave the antenna rod in free space (as in the picture below), make the top section about <ins style="font-weight: bold; text-decoration: none;">2 mm </ins>longer, if you put a <ins style="font-weight: bold; text-decoration: none;">20 mm </ins>plastic tube over it, shorten the top section by 5mm. I do not know the influence of a wide diameter (<ins style="font-weight: bold; text-decoration: none;">50 mm </ins>- <ins style="font-weight: bold; text-decoration: none;">100 mm</ins>) plastic tube, maybe this is then just matching the given length.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;gallery&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;gallery&gt;</div></td></tr> <tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9">Line 9:</td> <td colspan="2" class="diff-lineno">Line 9:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Click on the pictures for higher resolution (drawing from orignal web page, in order to copy before it disappears there)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Click on the pictures for higher resolution (drawing from orignal web page, in order to copy before it disappears there)</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A final note for manufacturing: Take a long wire and put markers for the sections on it: <del style="font-weight: bold; text-decoration: none;">136mm </del>-&gt; 65.<del style="font-weight: bold; text-decoration: none;">5mm </del>-&gt; <del style="font-weight: bold; text-decoration: none;">205mm </del>-&gt; 65.<del style="font-weight: bold; text-decoration: none;">5mm </del>-&gt; <del style="font-weight: bold; text-decoration: none;">190mm</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A final note for manufacturing: Take a long wire and put markers for the sections on it: <ins style="font-weight: bold; text-decoration: none;">136 mm </ins>-&gt; 65.<ins style="font-weight: bold; text-decoration: none;">5 mm </ins>-&gt; <ins style="font-weight: bold; text-decoration: none;">205 mm </ins>-&gt; 65.<ins style="font-weight: bold; text-decoration: none;">5 mm </ins>-&gt; <ins style="font-weight: bold; text-decoration: none;">190 mm</ins>.</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Then first roll the inductors (1.5 turns onto a 9.<del style="font-weight: bold; text-decoration: none;">5mm </del>drill) and second do the 90° bends in order to get it straight.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Then <ins style="font-weight: bold; text-decoration: none;">'''</ins>first<ins style="font-weight: bold; text-decoration: none;">''' </ins>roll the inductors (1.5 turns onto a 9.<ins style="font-weight: bold; text-decoration: none;">5 mm </ins>drill) and <ins style="font-weight: bold; text-decoration: none;">'''</ins>second<ins style="font-weight: bold; text-decoration: none;">''' </ins>do the 90° bends in order to get it straight.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Another good antenna, which is easy to build (you may leave away the loop with acceptable degradation) can be found on [http://www.lll.lu/%7Eedward/edward/adsb/antenna/ADSBantenna.html Edward&#039;s page].</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Another good antenna, which is easy to build (you may leave away the loop with acceptable degradation) can be found on [http://www.lll.lu/%7Eedward/edward/adsb/antenna/ADSBantenna.html Edward&#039;s page].</div></td></tr> </table>

imported>Beastadmin https://wiki.jetvision.de/index.php?title=Accessories:G7RGQ_Omni_Directiona_Antenna&diff=2737&oldid=prev 2013-11-10T18:35:21Z

<p>Created page with &quot;For a long time, until I got the russian wonder, I was using this [http://www.kineticavionics.co.uk/forums/viewtopic.php?f=1&amp;t=7489&amp;sid=a97d41478e66511dd5cf715ee7c88df0&amp;start=...&quot;</p> <p><b>New page</b></p><div>For a long time, until I got the russian wonder, I was using this [http://www.kineticavionics.co.uk/forums/viewtopic.php?f=1&amp;t=7489&amp;sid=a97d41478e66511dd5cf715ee7c88df0&amp;start=24 antenna] but with quarter wavelength radials only. Don&#039;t know what the author hopes to gain from longer ones, within 30 years of ham radio life I never saw radials different to half wavelength. I have measured one on a network analyzer. If you leave the antenna rod in free space (as in the picture below), make the top section about 2mm longer, if you put a 20mm plastic tube over it, shorten the top section by 5mm. I do not know the influence of a wide diameter (50mm - 100mm) plastic tube, maybe this is then just matching the given length.<br /> <br /> &lt;gallery&gt;<br /> File:S11-adsb.gif<br /> File:Picadsb-antenna.jpg<br /> File:ADS-B-antenna-drawing.gif<br /> &lt;/gallery&gt;<br /> <br /> Click on the pictures for higher resolution (drawing from orignal web page, in order to copy before it disappears there)<br /> <br /> A final note for manufacturing: Take a long wire and put markers for the sections on it: 136mm -&gt; 65.5mm -&gt; 205mm -&gt; 65.5mm -&gt; 190mm.<br /> Then first roll the inductors (1.5 turns onto a 9.5mm drill) and second do the 90° bends in order to get it straight.<br /> <br /> Another good antenna, which is easy to build (you may leave away the loop with acceptable degradation) can be found on [http://www.lll.lu/%7Eedward/edward/adsb/antenna/ADSBantenna.html Edward&#039;s page].</div>

imported>Beastadmin