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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>In last weeks Tacos meeting, on the ways to make a CW filter, the discussion had me think of using analog components, and I used a filter designer to generate some numbers, what is a good way to simulate this to see its curve? Pspice? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Would a VNA gadget you showed plot the curve of this filter board? If I only had a signal generator (455 kHz, to simulate CW carrier 2<sup>nd</sup> IF stage) and a spectrum analyzer, that couldn’t be used to generate a filter curve right because it wouldn’t sweep? Any poor mans way of sweeping (e.g., manual and then plotting the level?)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Is there a software VNA that can plot the filter curve? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:9.6pt;background:white'><b><span style='font-size:14.5pt;font-family:"Arial",sans-serif;color:black'>Bandpass Filter Calculator<o:p></o:p></span></b></p><p class=MsoNormal style='margin-bottom:9.6pt;background:white'><b><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Passive Bandpass Filter<o:p></o:p></span></b></p><p class=MsoNormal><img width=415 height=198 style='width:4.325in;height:2.0666in' id="Picture_x0020_2" src="cid:image001.png@01D71DDF.F5242C20" alt="Passive bandpass filter"><span style='font-size:10.5pt;font-family:"Times New Roman",serif;color:black'><br><br></span><b><span style='font-size:14.5pt;font-family:"Arial",sans-serif;color:black'>Passive Bandpass Filter Formulas<o:p></o:p></span></b></p><p class=MsoNormal><img width=379 height=139 style='width:3.95in;height:1.45in' id="Picture_x0020_1" src="cid:image002.png@01D71DDF.F5242C20" alt="Passive bandpass filter formulas"><span style='font-size:10.5pt;font-family:"Times New Roman",serif;color:black'><br><br><br>Using Low Cutoff 454850 Hz, High Cutoff 455150 Hz, we get:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white'>C</span><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black;background:white'>1</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white'>: 100nF</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black'><br><span style='background:white'>R</span></span><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black;background:white'>1</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white'>: 4Ω</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black'><br><span style='background:white'>C</span></span><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black;background:white'>2</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white'>: 1nF</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black'><br><span style='background:white'>R</span></span><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:black;background:white'>2</span><span style='font-size:13.5pt;font-family:"Arial",sans-serif;color:black;background:white'>: 350Ω</span><span style='font-size:10.5pt;font-family:"Times New Roman",serif;color:black'><br><br></span><o:p></o:p></p></div></body></html>