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<body class='hmmessage'><div dir='ltr'><font color="#000000">All accepted Alex - yes - this is my </font>subject as you know and has been for well over 50 years<div><font color="#000000">I was simply pointing out to Alan that using the phrase </font><span style="background-color: rgb(255, 255, 255);"><font size="3"><span style="line-height: 19.88px;">"20cm patch antennas" in isolation conveys no useful information whatsoever.</span></font></span><font color="#000000"><br id="FontBreak"></font><br><div style="line-height:21.3px;color:rgb(68, 68, 68);background-color:rgb(255, 255, 255);"><p class="ecxMsoNormal" style="line-height:22.72px;background-image:initial;background-attachment:initial;background-size:initial;background-origin:initial;background-clip:initial;background-position:initial;background-repeat:initial;"><font face="Calibri" size="3"><span style="line-height:22.72px;"><span style="line-height:22.72px;color:rgb(34, 34, 34);">Ian Hickling</span></span><span style="color:rgb(34, 34, 34);line-height:17.9867px;line-height:17.9867px;"></span></font></p></div><p class="ecxMsoNormal" style="line-height:22.72px;color:rgb(68, 68, 68);background-color:rgb(255, 255, 255);"><span style="line-height:22.72px;color:rgb(34, 34, 34);background-image:initial;background-attachment:initial;background-size:initial;background-origin:initial;background-clip:initial;background-position:initial;background-repeat:initial;"><font face="Calibri" size="3">Partner</font></span><span style="font-size:12pt;font-family:Calibri, sans-serif;line-height:22.72px;"><br style="line-height:22.72px;"><br style="line-height:22.72px;"><a href="http://www.transplanuk.com/" target="_blank" style="line-height:22.72px;font-weight:inherit;color:blue;cursor:pointer;"><span style="line-height:22.72px;color:rgb(17, 85, 204);text-decoration:none;"><img border="0" id="ecx_x0000_i1025" src="https://ci4.googleusercontent.com/proxy/2SkDsnIzSZgRbNnNKBSiwxiFhFQWRGV55mTjVL23fulnJpstZmYxeKrrYefY4qxiSgkMrAETld64XINLXCsujE_zI5gAsQyWeCWvHixcrNYtar3Sij4YlVBgN2NSQ-n2DsgZvrnpWZlfwCQ=s0-d-e1-ft#http://www.transplanuk.com/wp-content/uploads/2014/07/transplan_UK_weblogo_190x60.png" style="line-height:22.72px;border:none;"></span></a></span></p><div style="line-height:21.3px;color:rgb(68, 68, 68);background-color:rgb(255, 255, 255);"><p class="ecxMsoNormal" style="line-height:22.72px;font-family:'Times New Roman', serif;"><font size="2"><i style="line-height:22.72px;"><span style="line-height:22.72px;font-family:Arial, sans-serif;color:rgb(34, 34, 34);">Office: 016 3557 8435 (07h to 22h GTS)</span></i><span style="font-family:Arial, sans-serif;color:rgb(34, 34, 34);line-height:17.9867px;"></span></font></p></div><div style="line-height:21.3px;color:rgb(68, 68, 68);background-color:rgb(255, 255, 255);"><p class="ecxMsoNormal" style="line-height:22.72px;font-family:'Times New Roman', serif;"><font size="2"><i style="line-height:22.72px;"><span style="line-height:22.72px;font-family:Arial, sans-serif;color:rgb(34, 34, 34);">Car: 075 3098 0115 (only responds when driving)</span></i><span style="line-height:17.9867px;font-family:Arial, sans-serif;color:rgb(34, 34, 34);"></span></font></p></div><div style="line-height:21.3px;color:rgb(68, 68, 68);background-color:rgb(255, 255, 255);"><p class="ecxMsoNormal" style="line-height:22.72px;font-family:'Times New Roman', serif;"><i style="line-height:22.72px;"><span style="line-height:22.72px;font-family:Arial, sans-serif;color:rgb(34, 34, 34);"><font size="2">6 Horn Street, Compton, NEWBURY, RG20 6QS</font></span></i></p></div><br><br><div><hr id="stopSpelling">From: tlr@gairloch.co.uk<br>To: cma-l@mailman.commedia.org.uk<br>Date: Sat, 4 Jun 2016 12:14:50 +0100<br>Subject: Re: [cma-l] Radio Link Transmission systems<br><br><style><!--
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--></style><div class="ecxWordSection1"><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">Just look up the datasheets for any of the antennas Ian – they give all the usual polar patterns, gain figures, FB ratios etc as you would get for any broadcast antenna. They’re much what you expect – the panel antennas are in simplest terms just a broadside phased array, just like you might construct with conventional metalwork antennas.</span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">As with the more familiar dipoles and Yagis they can be scaled and optimized for gain, pattern and operating frequencies, but typically aren’t used below 300MHz. Gains typically range over 0-24dBi, for higher gains dishes tend to be more practical and better controlled patterns. Panels tend to have more sidelobes and poorer front-back ratios than end fire arrays like Yagis or dishes, but can be relatively easily screened at higher frequencies.</span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">Eg for the <a href="http://www.amphenol-antennas.com/getattachment/d407a33f-db8d-40cb-999a-f17377f11410/Products/Antennas/Antenna-Accessories-%281%29/Tri-Sector-TRIO-Accessories-%281%29/GPS-Antenna-Mounts/5680000.aspx" target="_blank">Jaybeam 14dB 568000</a> one we use on our STL: </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"><img border="0" width="719" height="265" id="ecxPicture_x0020_1" src="cid:image002.jpg@01D1BE5A.B1586770"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"></span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">For a typical 5.8GHz 21dBi w-fi panel:</span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"><img border="0" width="746" height="354" id="ecxPicture_x0020_2" src="cid:image003.jpg@01D1BE5A.58FCED80"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"></span></p><p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;"> </span></p><div><div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm;"><p class="ecxMsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;"> <a href="mailto:cma-l-bounces@mailman.commedia.org.uk">cma-l-bounces@mailman.commedia.org.uk</a> [<a href="mailto:cma-l-bounces@mailman.commedia.org.uk">mailto:cma-l-bounces@mailman.commedia.org.uk</a>] <b>On Behalf Of </b>Ian Hickling<br><b>Sent:</b> 03 June 2016 22:45<br><b>To:</b> The Community Media Association Discussion List <<a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a>><br><b>Subject:</b> [cma-l] Radio Link Transmission systems</span></p></div></div><p class="ecxMsoNormal"> </p><div><p class="ecxMsoNormal" style=""><span style="font-family:"Calibri",sans-serif;color:black;">I'm familiar with that general principle - very common in mobile phone base station panel construction - but as an antenna engineer I was more concerned with the operating frequency, forward gain and propagation pattern - which as yet are not clear from what I can read here.</span><span style="font-family:"Calibri",sans-serif;"></span></p><div><p class="ecxMsoNormal" style="line-height:17.05pt;background:white;background-image:initial;background-attachment:initial;background-size:initial;background-origin:initial;background-clip:initial;background-position:initial;background-repeat:initial;"><span style="font-family:"Calibri",sans-serif;color:#222222;">Ian Hickling</span><span style="font-family:"Calibri",sans-serif;color:#444444;"></span></p></div><p class="ecxMsoNormal" style="line-height:17.05pt;background:white;"><span style="font-family:"Calibri",sans-serif;color:#222222;">Partner</span><span style="font-family:"Calibri",sans-serif;color:#444444;"><br><br><a href="http://www.transplanuk.com/" target="_blank"><span style="color:#1155CC;text-decoration:none;"><img border="0" id="ecx_x005f_x0000_i1025" src="https://ci4.googleusercontent.com/proxy/2SkDsnIzSZgRbNnNKBSiwxiFhFQWRGV55mTjVL23fulnJpstZmYxeKrrYefY4qxiSgkMrAETld64XINLXCsujE_zI5gAsQyWeCWvHixcrNYtar3Sij4YlVBgN2NSQ-n2DsgZvrnpWZlfwCQ=s0-d-e1-ft#http://www.transplanuk.com/wp-content/uploads/2014/07/transplan_UK_weblogo_190x60.png"></span></a></span></p><div><p class="ecxMsoNormal" style="line-height:17.05pt;background:white;"><i><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222;">Office: 016 3557 8435 (07h to 22h GTS)</span></i><span style="color:#444444;"></span></p></div><div><p class="ecxMsoNormal" style="line-height:17.05pt;background:white;"><i><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222;">Car: 075 3098 0115 (only responds when driving)</span></i><span style="color:#444444;"></span></p></div><div><p class="ecxMsoNormal" style="line-height:17.05pt;background:white;"><i><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222;">6 Horn Street, Compton, NEWBURY, RG20 6QS</span></i><span style="color:#444444;"></span></p></div></div></div><br>
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