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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 ?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Jean-Pierre Desrochers <jpdesroc@oricom.ca><br>
<b>Sent:</b> 28 September 2023 20:17<br>
<b>To:</b> Synth-diy@synth-diy.org <Synth-diy@synth-diy.org><br>
<b>Subject:</b> [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??</font>
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<p class="x_MsoNormal">Hi all,</p>
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<p class="x_MsoNormal">This is an out off topics question but I will ask you anyway..<br>
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<p class="x_MsoNormal">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. </p>
<p class="x_MsoNormal">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.</p>
<p class="x_MsoNormal">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.<br>
<br>
</p>
<p class="x_MsoNormal">Any idea of good components for that ?</p>
<p class="x_MsoNormal"> </p>
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