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</o:shapelayout></xml><![endif]--></head><body lang=DA link=blue vlink=purple><div class=WordSection1><pre><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Hi All,<o:p></o:p></span></pre><pre><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></pre><pre><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>In the referenced DUBUS article SM5BSZ is talking about broadband TX-noise where the cure is filtering. Predistortion suppresses IMD and that’s another issue.<o:p></o:p></span></pre><pre><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></pre><p class=MsoNormal><span lang=EN-US>Vy 73 de OZ1FF - Kjeld</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Flex & Hermes user<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a href="http://www.oz1ff.dk/"><span lang=EN-US style='color:blue'>http://www.oz1ff.dk</span></a></span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><pre><span lang=EN-US><o:p> </o:p></span></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i><span lang=EN-US>Hi All,<o:p></o:p></span></i></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i><span lang=EN-US>The current state of the art with PureSignal <o:p></o:p></span></i></pre><pre><i><span lang=EN-US><</span><a href="http://www.n9vv.com/Images/Apache-Labs/PureSignal.pdf"><span lang=EN-US>http://www.n9vv.com/Images/Apache-Labs/PureSignal.pdf</span></a></i><i><span lang=EN-US>> on HPSDR and <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>also Stefan's work with the N2ADR <o:p></o:p></span></i></pre><pre><i><span lang=EN-US><</span><a href="http://dl2stg.de/stefan/hiqsdr/gnuradio.html"><span lang=EN-US>http://dl2stg.de/stefan/hiqsdr/gnuradio.html</span></a></i><i><span lang=EN-US>> transceiver is exciting! <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>I read each new post with high interest, and I guess this post will <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>hopefully spark some more. :-) I am really curious how well it works <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>on different types of amplifiers. So please pipe up if you have any <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>experience with any of these:<o:p></o:p></span></i></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i><span lang=EN-US>1) From what I've seen, the high voltage (50 V) LDMOS seems to work well.<o:p></o:p></span></i></pre><pre><i><span lang=EN-US>2) My memory says that I read somewhere that lower voltage solid state <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>amps don't work very well.<o:p></o:p></span></i></pre><pre><i><span lang=EN-US> a) Is this true, and if so is it true for both BJT and FET amps?<o:p></o:p></span></i></pre><pre><i><span lang=EN-US>3) How does it work with vacuum tube amps?<o:p></o:p></span></i></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i><span lang=EN-US>With the advent of SDRs showing the spectrum to everyone, and now with <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>predistortion, we might see hope for a big improvement in transmitted <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>signals, but this article <</span><a href="http://www.sm5bsz.com/dynrange/dubus313.pdf"><span lang=EN-US>http://www.sm5bsz.com/dynrange/dubus313.pdf</span></a></i><i><span lang=EN-US>> <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>shows that some popular SDR transmitters end up at the bottom of the list.<o:p></o:p></span></i></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i><span lang=EN-US>Thanks to all of you who have posted test results to the list, and to <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>those developing the code to enable the tests. I look forward to more <o:p></o:p></span></i></pre><pre><i><span lang=EN-US>great results!<o:p></o:p></span></i></pre><pre><i><span lang=EN-US><o:p> </o:p></span></i></pre><pre><i>73,<o:p></o:p></i></pre><pre><i><o:p> </o:p></i></pre><pre><i>Rob<o:p></o:p></i></pre><pre>KL7NA<o:p></o:p></pre><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>