<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif;"><div><div>Alex, </div><div><br></div><div>Excellent information, very informative – thank you!</div><div><br></div><div>Ian, if you would like to know more (although Alex clearly knows his stuff), then I’m more than happy to put you in touch with the MD of a company who have vast experience setting these systems up.</div><div><br></div><div>Regards</div><div> </div><div><div id=""><p class="MsoNormal"><span lang="EN-US"><font size="3">Alan<o:p></o:p></font></span></p><p class="MsoNormal"><br></p><p class="MsoNormal" style="font-family: Calibri, sans-serif; font-size: 14px;"><span lang="EN-US"><font size="3"><span style="color: rgb(107, 0, 109);"></span></font></span></p></div></div></div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:12pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> <<a href="mailto:cma-l-bounces@mailman.commedia.org.uk">cma-l-bounces@mailman.commedia.org.uk</a>> on behalf of "<a href="mailto:tlr@gairloch.co.uk">tlr@gairloch.co.uk</a>" <<a href="mailto:tlr@gairloch.co.uk">tlr@gairloch.co.uk</a>><br><span style="font-weight:bold">Reply-To: </span> "<a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a>" <<a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a>><br><span style="font-weight:bold">Date: </span> Saturday, 4 June 2016 at 15:46<br><span style="font-weight:bold">To: </span> "<a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a>" <<a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a>><br><span style="font-weight:bold">Subject: </span> [cma-l] [***SPAM***] Re: Radio Link Transmission systems<br></div><div><br></div><p dir="ltr">Ah, I see, but he was just giving a broad description of the setup wasn't he?</p><p dir="ltr">Of course if you know the frequency (5.8GHz in this case), you can make a pretty good assumption about the antenna gain, pattern etc, especially if it's a simple old single polarisation model. </p><p dir="ltr">Alex<br></p><div class="gmail_quote">On 4 Jun 2016 14:08, Ian Hickling <<a href="mailto:transplanfm@hotmail.com">transplanfm@hotmail.com</a>> wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><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></font><br><div style="line-height:21.3px;color:rgb( 68 , 68 , 68 );background-color:rgb( 255 , 255 , 255 )"><p style="line-height:22.72px"><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 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 )"><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/" style="line-height:22.72px;font-weight:inherit;color:blue"><span style="line-height:22.72px;color:rgb( 17 , 85 , 204 );text-decoration:none"><img border="0" 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 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 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 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>From: <a href="mailto:tlr@gairloch.co.uk">tlr@gairloch.co.uk</a><br>To: <a href="mailto:cma-l@mailman.commedia.org.uk">cma-l@mailman.commedia.org.uk</a><br>Date: Sat, 4 Jun 2016 12:14:50 +0100<br>Subject: Re: [cma-l] Radio Link Transmission systems<br><br><div><p><span style="font-size:11pt;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><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><p><span style="font-size:11pt;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><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><p><span style="font-size:11pt;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">Jaybeam 14dB 568000</a> one we use on our STL: </span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"><img border="0" width="719" height="265" src="cid:image002.jpg@01D1BE5A.B1586770"></span><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"></span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d">For a typical 5.8GHz 21dBi w-fi panel:</span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"><img border="0" width="746" height="354" src="cid:image003.jpg@01D1BE5A.58FCED80"></span><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"></span></p><p><span style="font-size:11pt;font-family:'calibri' , sans-serif;color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #e1e1e1 1pt;padding:3pt 0cm 0cm 0cm"><p><b><span style="font-size:11pt;font-family:'calibri' , sans-serif">From:</span></b><span style="font-size:11pt;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> </p><div><p><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 style="line-height:17.05pt;background:white"><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 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/"><span style="color:#1155cc;text-decoration:none"><img border="0" 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 style="line-height:17.05pt;background:white"><i><span style="font-size:10pt;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 style="line-height:17.05pt;background:white"><i><span style="font-size:10pt;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 style="line-height:17.05pt;background:white"><i><span style="font-size:10pt;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><table style="border-top:1px solid #d3d4de"><tbody><tr><td style="width:55px;padding-top:13px"><a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient"><img src="https://ipmcdn.avast.com/images/2016/icons/icon-envelope-tick-round-orange_184x116-v1.png" height="29px"></a></td><td style="width:470px;padding-top:12px;color:#41424e;font-size:13px;font-family:'arial' , 'helvetica' , sans-serif;line-height:18px">Virus-free. <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient" style="color:#4453ea">www.avast.com</a>
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