<html><body bgcolor="#FFFFFF"><div>Hi Helmut</div><div><br></div><div>I changed my measurement connections this am. No ripple now on JP2. Must have been the clock pickup on the scope probe ground lead.</div><div><br></div><div>Will post revised bmp file later today.</div><div><br></div><div>Thanks for the confirmation.</div><div><br></div><div>73 </div><div><br></div><div>Rick ve3mm<br><br>On 2011-09-04, at 7:12 AM, "Helmut" <<a href="mailto:dc6ny@gmx.de">dc6ny@gmx.de</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Hi,<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">using same software version and test conditions on my Penelope:<o:p></o:p></span></p>
<p class="MsoNormal"><u><span lang="EN-US" style="font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D">No</span></u><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
122Mc ripple can be detected on the input signal with my Tektronix scope. I think
if the ripple would really exist, the output waveform should show the same.<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>
<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>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:hpsdr-bounces@lists.openhpsdr.org">hpsdr-bounces@lists.openhpsdr.org</a> [mailto:hpsdr-bounces@lists.openhpsdr.org] <b>Im
Auftrag von </b>Rick ve3mm<br>
<b>Gesendet:</b> Sonntag, 4. September 2011 00:31<br>
<b>An:</b> <a href="mailto:hpsdr@lists.openhpsdr.org"><a href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a></a><br>
<b>Betreff:</b> [hpsdr] Penelope Input and Output Voltages and Waveforms<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Duane W5PNM asked for assistance on Teamspeak last night in
diagnosing a suspected problem with his Penelope. He was looking for
information on the input and output voltages at Penelope's output device
(OPA2874 Op Amp). <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here are some measurements on my Penelope. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Setup:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Software: K5SO PWSDR 1.19.3.5 diversity20<o:p></o:p></p>
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<p class="MsoNormal">Frequency 7.010 Mhz.<o:p></o:p></p>
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<p class="MsoNormal">Power Output measured at 500 mW into 50 ohm load<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Voltage measurement at JP2 (Input to T1) 295mV RMS<o:p></o:p></p>
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<p class="MsoNormal">Voltage measurement at 50 ohm load 5.10V RMS<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Measurements were taken with an Agilent Oscilloscope MSO-X
2024A.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have uploaded a screenshot of the scope at <a href="http://Hamsdr.com">Hamsdr.com</a> in
my personal files section.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="http://www.hamsdr.com/PersonalDirectory.aspx?did=44"><a href="http://www.hamsdr.com/PersonalDirectory.aspx?did=44">http://www.hamsdr.com/PersonalDirectory.aspx?did=44</a></a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As is usual in most experiments, one thing leads to
something unexpected......<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The input waveform shows a definite 122 Mhz ripple. I
am not sure if it really there ....is it an artifact a poor scope connection or
is it leakage from the clock connection between my two mercury cards (used for
synchronization for diversity reception). More investigation is needed.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">73<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Rick ve3mm<o:p></o:p></p>
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