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<DIV><FONT size=2 face=Arial>Hi Ben,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The openHPSDR Penelope exciter was designed to
enable predistortion to be added when required. It provides an ADC input
that could take the envelope of your transmitted signal and compare it
with the envelope of the required signal i.e. Sqrt(I*I +
Q*Q).</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The envelope of the output of Penelope is already
available at the output of the ADC (U16). I did some initial test some
time ago but the IMD performance of Penny is very good and does not benefit from
adding predistortion. It did indicate that the technique is feasible and I'm
sure would improve the performance of a subsequent PA stage. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The ADT-200A (<A
href="http://www.adat.ch/index_e.html">http://www.adat.ch/index_e.html</A>) does
use adaptive predistortion very effectively.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>73's Phil...VK6APH </FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=pa5bw@xs4all.nl href="mailto:pa5bw@xs4all.nl">Ben Witvliet</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, July 23, 2010 6:24 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [hpsdr] EER finals,
predistortion</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
*****<BR><BR>
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<DIV class=WordSection1>
<P class=MsoNormal>Dear all,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN lang=EN-US>I found the following (commercial)
publication on very high efficiency RF power amplifiers:<o:p></o:p></SPAN></P>
<P class=MsoNormal><A
href="http://www.mathworks.nl/company/newsletters/digest/2010/july/nujira-amplifier-performance.html?s_v1=13445411_1-6XCKGU"><SPAN
lang=EN-US>http://www.mathworks.nl/company/newsletters/digest/2010/july/nujira-amplifier-performance.html?s_v1=13445411_1-6XCKGU</SPAN></A><SPAN
lang=EN-US><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>It is of course a success story describing
the benefit of their own product, but the message I get from it: EER as we
meant to achieve in Thor can be done. <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>Also the article mentions the use of
predistortion to create a very linear amplifier. I heard that before from an
English consultant (For my QRL I participate in European standardization
work). He said that mobile phone network operators had great success with
predistortion to get rid of IMD products on combined installations. So I see
the remark in this document as a confirmation that that has become feasible
with “average” means. I haven´t seen any amateur publications yet on the use
of non-linear or not-so-linear amplifiers and predistortion. With the
processing power we have in HPSDR this may come within
reach.<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>By the way: as a MatLab user I’m very
interested in using Simulink to simulate such applications. Makes it possible
to replace the MatLab software blocks bit-by-bit by real-life
hardware.<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>Justed wanted to share this information
with you.<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>Kindest regards, 73,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Ben, PA5BW<o:p></o:p></SPAN></P></DIV>
<P>
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