http://wiki.hamtools.org/index.php?action=history&feed=atom&title=Front-to-back_ratio 2026-05-02T05:27:23Z Revision history for this page on the wiki MediaWiki 1.38.1 http://wiki.hamtools.org/index.php?title=Front-to-back_ratio&diff=2656&oldid=prev 2009-04-09T00:59:04Z

<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 17:59, 8 April 2009</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l10">Line 10:</td> <td colspan="2" class="diff-lineno">Line 10:</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>FBR is of course meaningless for omnidirectional antennas.</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>FBR is of course meaningless for omnidirectional antennas.</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></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><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></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><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></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><ins style="font-weight: bold; text-decoration: none;">{{antennas}}</ins></div></td></tr> </table>

Carlb http://wiki.hamtools.org/index.php?title=Front-to-back_ratio&diff=2095&oldid=prev 2008-08-23T00:55:56Z

<p>Protected &quot;<a href="/index.php/Front-to-back_ratio" title="Front-to-back ratio">Front-to-back ratio</a>&quot; [edit=autoconfirmed:move=autoconfirmed]</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <tr class="diff-title" lang="en"> <td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:55, 22 August 2008</td> </tr><tr><td colspan="2" class="diff-notice" lang="en"><div class="mw-diff-empty">(No difference)</div> </td></tr></table>

TimVK4YEH http://wiki.hamtools.org/index.php?title=Front-to-back_ratio&diff=2090&oldid=prev 2008-08-23T00:12:30Z

<p>content from old fbr page</p> <p><b>New page</b></p><div>Related wiki pages: [[Antennas]], [[Gain]], [[Propagation]], [[SWR]]<br /> <br /> Front-to-back ratio (FBR) is a measure of how effectively a directional antennas, eg [[Yagi]], [[Log Periodic (LPDA)]], [[Dish or Parabola]] projects RF energy in the desired direction.<br /> <br /> It is calculated as the ratio of the maximum directivity of the antenna to the directivity in the opposite direction.<br /> <br /> To quantify FBR, a radiation pattern plot is drawn. <br /> <br /> FBR = maximum radiation (dB) in the forward direction - maximum radiation (dB) at &lt;math&gt; 180^0 &lt;/math&gt;<br /> <br /> FBR is of course meaningless for omnidirectional antennas.</div>

TimVK4YEH