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<body class='hmmessage'><div dir='ltr'>If only it were as simple as that!<br>I must admit that I hadn't looked at it like that - <span style="font-family: sans-serif; font-size: 14px; line-height: 22.4px; background-color: rgb(255, 255, 255);">531 to 1,611 kHz gives a quarter wave range of of 141 metres to 46 metres - yes - three to one!</span><div><font face="sans-serif"><span style="font-size: 14px; line-height: 22.4px;">But do you fancy buying/siting/building even a 46m guyed vertical radiator - 152 feet high?<br></span></font>Apparently there are only 9 AM frequencies that Ofcom feels able to allocate to LP operation - I'll see if I can find out what they are.<br><br><div><div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8000001907349px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;widows:1;word-spacing:0px;background-color:rgb(255, 255, 255);"><font size="3"><b>Ian Hickling</b><br></font></div><font style="color:rgb(34, 34, 34);font-family:arial,sans-serif;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;widows:1;word-spacing:0px;background-color:rgb(255, 255, 255);font-size:12pt;" size="3"><font style="color:rgb(34, 34, 34);background-color:rgb(255, 255, 255);">Partner</font></font><br><br><a href="http://www.transplanuk.com/" target="_blank" style="color:rgb(17, 85, 204);"><img alt="" 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"></a><div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8000001907349px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;widows:1;word-spacing:0px;"><i><font size="3">Office: 01635 578435 (7am-11pm UK time)</font></i></div><div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8000001907349px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;widows:1;word-spacing:0px;"><i><font size="3">Carphone: 07530 980115 (only responds when driving)</font></i></div><div style="color:rgb(34, 34, 34);font-family:arial, sans-serif;font-size:12.8000001907349px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;widows:1;word-spacing:0px;"><i><font size="3">6 Horn Street, Compton, NEWBURY, RG20 6QS</font></i></div></div><br><br><div><hr id="stopSpelling">Date: Wed, 16 Sep 2015 21:28:28 +0100<br>From: tlr@gairloch.co.uk<br>To: cma-l@mailman.commedia.org.uk<br>Subject: Re: [cma-l] AM community radio<br><br>
Given that the MF AM band covers a 3:1 frequency range, is Ofcom at least able to allocate a frequency at the high end of the band, making any given given aerial design a third the size it would be at the LF end of the band? Just wonderin'!<br><BR><br><BR>Alex<br><BR><blockquote>On 16 September 2015 at 20:20 Ian Hickling <transplanfm@hotmail.com> wrote:<br><br><div dir="ltr">All perfectly acc<span style="font-size:12pt;">eptable - but as an experienced propagation engineer my concern is that any departure from a vertical end-corrected quarter wave radiator operating on a groundplane of at least .55 wavelength diameter, the energy propagation pattern is uncertain and effectively impossible to either determine or plot.</span><div>In order to take his order - and his money - I have to give the Client an assurance that he will be able to cover his audience effectively - and that simply isn't possible with a cut-down compensated radiator on a much smaller earth mat.<br><br><div><div style="color:#222222;font-family:arial, sans-serif;font-size:12.8000001907349px;font-style:normal;font-variant:normal;font-weight:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;"><span style="font-size:medium;"><strong>Ian Hickling</strong><br></span></div><span style="color:#222222;font-family:arial,sans-serif;font-style:normal;font-variant:normal;font-weight:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:#ffffff;font-size:medium;"><span style="color:#222222;background-color:#ffffff;">Partner</span></span></div></div></div></blockquote>
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