<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 <transplanfm@hotmail.com> 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: 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 /><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>
</td></tr></tbody></table><br />_______________________________________________
Reply - cma-l@commedia.org.uk
The cma-l mailing list is a members' service provided by the Community Media Association - http://www.commedia.org.uk
Twitter: http://twitter.com/community_media
http://www.facebook.com/CommunityMediaAssociation
Canstream Internet Radio & Video: http://www.canstream.co.uk/
_______________________________________________
Mailing list guidelines: http://www.commedia.org.uk/about/cma-email-lists/email-list-guidelines/
_______________________________________________
To unsubscribe or manage your CMA-L mailing list subscription please visit:
http://mailman.commedia.org.uk/mailman/listinfo/cma-l</div></div> </div></div>
</blockquote></div>