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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Pete,<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I guess you know that some modifications of the frontend are
necessary to use the RP as an appropriate SDR. Impedance transformation from
high to 50 ohms seems helpful as well as sufficient low-pass filtering for the
1. Nyquist zone. The preamp for frequencies > 7 MHz needs a redesign. When
you have done this work calibration can be taken as Warren has described. To
get best accuracy a high reference (signal source) level should be used to
employ as much bits of the ADC as possible (just below clipping).<o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>73, Helmut, DC6NY<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>Von:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Hpsdr
[mailto:hpsdr-bounces@lists.openhpsdr.org] <b>Im Auftrag von </b>Pete Smith
N4ZR<br>
<b>Gesendet:</b> Mittwoch, 26. Oktober 2016 20:25<br>
<b>An:</b> hpsdr@openhpsdr.org<br>
<b>Betreff:</b> [hpsdr] A real newbie question<o:p></o:p></span></p>
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<pre><o:p> </o:p></pre>
<p><span style='font-family:"Helvetica","sans-serif"'>I'm one of the RBN team,
and am comparison testing the QS1R and Red Pitaya receivers with VE3NEA's CW
Skimserv. I'm getting some anomalies that I can't explain with my 1960's level
of electronic sophistication, so I'm looking to begin comparing the two
receivers for things like sensitivity, MDS, and so on.</span><o:p></o:p></p>
<p><span style='font-family:"Helvetica","sans-serif"'>A very useful tool would
be an SDR console capable of running with both the QS1R and the Red Pitaya
(with software by Pavel Demin). I have SDRMAXV for the QS1R and PowerSDR
from your website, but have no idea whether the signal level readouts on the
two programs are in any way comparable.</span><o:p></o:p></p>
<p><span style='font-family:"Helvetica","sans-serif"'>Does anyone know of a
console that will run with both sets of hardware and provide signal levels in
dBm?</span><o:p></o:p></p>
<p><span style='font-family:"Helvetica","sans-serif"'>Alternatively, can anyone
tell me if PowerSDRmRX PS is fairly accurate with its signal strength readouts,
or at least consistent from 160 to 10M? I'm seeing about a 20 dB
reduction in sensitivity of the Red Pitaya at 20M and above compared with 40
and below.</span><o:p></o:p></p>
<p class=MsoNormal>TIA<br>
<br>
<br>
<o:p></o:p></p>
<pre>73, Pete N4ZR<o:p></o:p></pre><pre>Download the new N1MM Logger+ at <o:p></o:p></pre><pre><a
href="http://N1MM.hamdocs.com"><http://N1MM.hamdocs.com></a>. Check <o:p></o:p></pre><pre>out the Reverse Beacon Network at <o:p></o:p></pre><pre><a
href="http://reversebeacon.net"><http://reversebeacon.net></a>, now <o:p></o:p></pre><pre>spotting RTTY activity worldwide. <o:p></o:p></pre><pre>For spots, please use your favorite <o:p></o:p></pre><pre>"retail" DX cluster.<o:p></o:p></pre>
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