<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
Maybe. But some of the power of each of the sources will still be sent back into the PAs of the other sources, where the non-linearities occur. I think there are balanced arrangements where a null is created avoiding this happening, but needs an r.f. person
to say how to do this.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<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 21:25<br>
<b>To:</b> Synth-diy@synth-diy.org <Synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??</font>
<div> </div>
</div>
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
@font-face
{font-family:Aptos}
p.x_MsoNormal, li.x_MsoNormal, div.x_MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
a:link, span.x_MsoHyperlink
{color:blue;
text-decoration:underline}
p.x_xmsonormal, li.x_xmsonormal, div.x_xmsonormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
span.x_EmailStyle23
{font-family:"Calibri",sans-serif;
color:windowtext}
.x_MsoChpDefault
{font-size:10.0pt}
@page WordSection1
{margin:70.85pt 70.85pt 70.85pt 70.85pt}
div.x_WordSection1
{}
-->
</style>
<div lang="FR-CA" link="blue" vlink="purple" style="word-wrap:break-word">
<div class="x_WordSection1">
<p class="x_MsoNormal"><span style="">Here is a block diagram of something that could work for me..</span></p>
<p class="x_MsoNormal"><span style="">I think..</span></p>
<p class="x_MsoNormal"><span style=""><img width="380" height="410" id="x_Image_x0020_1" style="width:3.9583in; height:4.2708in" data-outlook-trace="F:1|T:1" src="cid:image001.jpg@01D9F228.6D82C2C0"></span><span style=""></span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style=""> </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="x_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.. ??</span></p>
</div>
</div>
<p class="x_MsoNormal"> </p>
<div>
<p class="x_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 ?</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Aptos",sans-serif; color:black"> </span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Aptos",sans-serif; color:black"> </span></p>
</div>
<div class="x_MsoNormal" align="center" style="text-align:center">
<hr size="2" width="98%" align="center">
</div>
<div id="x_divRplyFwdMsg">
<p class="x_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>
</p>
<div>
<p class="x_MsoNormal"> </p>
</div>
</div>
<div>
<div>
<p class="x_xmsonormal">Hi all,</p>
<p class="x_xmsonormal"> </p>
<p class="x_xmsonormal" style="margin-bottom:12.0pt">This is an out off topics question but I will ask you anyway..</p>
<p class="x_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. </p>
<p class="x_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.</p>
<p class="x_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.</p>
<p class="x_xmsonormal">Any idea of good components for that ?</p>
<p class="x_xmsonormal"> </p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>