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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"'>
hpsdr-bounces@lists.openhpsdr.org [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> hpsdr@lists.openhpsdr.org<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>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 Hamsdr.com 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">http://www.hamsdr.com/PersonalDirectory.aspx?did=44</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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<p class=MsoNormal><o:p> </o:p></p>
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