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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SDR is definitely the easy bit Glyn - one of my Hack RFs has been txing a solid DAB signal now for 186 days (I still have 3)!! </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>Kind Regards<br><br>Andy S Clarke</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'>Managing Director - Ringtone.net Ltd.<br></span><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:black'><br></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'><br></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="blocked::http://www.ringtone.net/aboutus.html" title="blocked::http://www.ringtone.net/aboutus.html"><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:red'>http://www.ringtone.net/aboutus.html</span></a></span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:black'><img border=0 width=240 height=26 id="Picture_x0020_1" src="cid:image001.png@01D0EFE0.E95B4550" alt="cid:image003.png@01D06D77.D7B3B940"><br>Severn FM is a registered trademark of Ringtone.net Ltd, a company Registered in England No. 4225273. </span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:black'><br><br></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> cma-l-bounces@mailman.commedia.org.uk [mailto:cma-l-bounces@mailman.commedia.org.uk] <b>On Behalf Of </b>Associated Broadcast Consultants<br><b>Sent:</b> 15 September 2015 10:34<br><b>To:</b> The Community Media Association Discussion List<br><b>Subject:</b> Re: [cma-l] AMCR - SDR<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>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">http://www.ebay.co.uk/itm/HackRF-One-Software-Defined-Radio-NEW-Unopened-FREE-Postage-BARGAIN-/271983417851?hash=item3f537999fb</a><o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>I can't help feeling though that the SDR is the "easy" part. The difficult part is getting an efficient aerial system.<o:p></o:p></p></div><p class=MsoNormal>Glyn<o:p></o:p></p><div><div><p class=MsoNormal><br>-- <o:p></o:p></p><div><p class=MsoNormal>Glyn Roylance - Principal Consultant <o:p></o:p></p><div><div><p class=MsoNormal><a href="http://www.a-bc.co.uk/" target="_blank">Associated Broadcast Consultants</a><o:p></o:p></p></div></div><div><p class=MsoNormal> <o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br><br><br><br><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 15 September 2015 at 08:16, Tony Bailey <<a href="mailto:ravensound@pilgrimsound.co.uk" target="_blank">ravensound@pilgrimsound.co.uk</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal>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<o:p></o:p></p><div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div></div></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><br clear=all><o:p></o:p></p></div></div></div></div></div></body></html>