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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Here is a block diagram of something that could work for me..<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>I think..<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><img width=380 height=410 style='width:3.9583in;height:4.2708in' id="Image_x0020_1" src="cid:image001.jpg@01D9F228.6D82C2C0"></span><span style='mso-fareast-language:EN-US'><o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=FR>De :</span></b><span lang=FR> Mike Bryant <mbryant@futurehorizons.com> <br><b>Envoyé :</b> 28 septembre 2023 15:40<br><b>À :</b> Jean-Pierre Desrochers <jpdesroc@oricom.ca>; Synth-diy@synth-diy.org<br><b>Objet :</b> Re: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Aptos",sans-serif;color:black'>Yes it can be done, but even the slightest non-linearity produces countless intermodulation products. Why not just A-D the signal (plenty of SDR chips around nowadays) and mix in an FPGA where you can control out of band signals ?<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Aptos",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Aptos",sans-serif;color:black'><o:p> </o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="98%" align=center></div><div id=divRplyFwdMsg><p class=MsoNormal><b><span style='color:black'>From:</span></b><span style='color:black'> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org">synth-diy-bounces@synth-diy.org</a>> on behalf of Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca">jpdesroc@oricom.ca</a>><br><b>Sent:</b> 28 September 2023 20:17<br><b>To:</b> <a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a> <<a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>><br><b>Subject:</b> [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??</span> <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><p class=xmsonormal>Hi all,<o:p></o:p></p><p class=xmsonormal> <o:p></o:p></p><p class=xmsonormal style='margin-bottom:12.0pt'>This is an out off topics question but I will ask you anyway..<o:p></o:p></p><p class=xmsonormal>I want to build a 4 channel mixer that would receive signal frequencies between 2Mhz and lower one channel..<br>These 4 frequencies won’t change. They will be fixed. <o:p></o:p></p><p class=xmsonormal>Google would give me lots of Radio/Ham solutions that imply the use of tuning coils and such things<br>I don’t want to get into.<o:p></o:p></p><p class=xmsonormal style='margin-bottom:12.0pt'>The idea would be to use ready available opamps with high bandwidth<br>with the use of resistors and caps only. Gain would be of one.<o:p></o:p></p><p class=xmsonormal>Any idea of good components for that ?<o:p></o:p></p><p class=xmsonormal> <o:p></o:p></p></div></div></div></div></body></html>