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<body class='hmmessage'><div dir='ltr'>For us - the easy part is getting an efficient aerial system!<br>Been doing it for 50-odd years!<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: Tue, 15 Sep 2015 10:33:45 +0100<br>From: info@a-bc.co.uk<br>To: cma-l@mailman.commedia.org.uk<br>Subject: Re: [cma-l] AMCR - SDR<br><br><div dir="ltr"><div>If anyone is interested I have Software Defined Radio for sale on Ebay at the moment. I've used the same type of unit to run a DAB test multiplex. I'm pretty sure I've recall that someone has already written the code to run it as a DRM transmitter.<br><br><a href="http://www.ebay.co.uk/itm/HackRF-One-Software-Defined-Radio-NEW-Unopened-FREE-Postage-BARGAIN-/271983417851?hash=item3f537999fb" target="_blank">http://www.ebay.co.uk/itm/HackRF-One-Software-Defined-Radio-NEW-Unopened-FREE-Postage-BARGAIN-/271983417851?hash=item3f537999fb</a><br><br></div><div>I can't help feeling though that the SDR is the "easy" part. The difficult part is getting an efficient aerial system.<br><br></div>Glyn<br><div><div><br>-- <br><div class="ecxgmail_signature">Glyn Roylance - Principal Consultant
<div>
<div><a href="http://www.a-bc.co.uk/" target="_blank">Associated Broadcast Consultants</a></div></div>
<div> </div></div><br><br><br><br><br><div class="ecxgmail_extra"><br><div class="ecxgmail_quote">On 15 September 2015 at 08:16, Tony Bailey <span dir="ltr"><<a href="mailto:ravensound@pilgrimsound.co.uk" target="_blank">ravensound@pilgrimsound.co.uk</a>></span> wrote:<br><blockquote class="ecxgmail_quote" style="border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<div>Hello Marc et al,<br>
<br>
I mentioned DRM on AM because it would be easily implemented in a
software box. I think the Talk 107 test used two programme
channels on one FM carrier. In fact the main issue with medium
wave is getting a stable earth system without ploughing a field!
Antennas can be short (most RSLs use them) but they aren't very
efficient due to being very small impedance compared to the
ground. As has been pointed out this isn't a problem if you can
site the antenna in (or on) water. I wondered if given that SDR
requires an rf box maybe a clever designer could come up with a
low impedance amp that could include matching directly connected
to the vertical antenna sitting on a ground plane.<br>
<br>
Regards, Tony<div><div class="h5"><br>
<br></div></div></div></div></blockquote></div><br clear="all"><br><br></div></div></div></div>
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