[sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??

Mike Bryant mbryant at futurehorizons.com
Thu Sep 28 22:33:52 CEST 2023


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.

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Jean-Pierre Desrochers <jpdesroc at oricom.ca>
Sent: 28 September 2023 21:25
To: Synth-diy at synth-diy.org <Synth-diy at synth-diy.org>
Subject: Re: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??


Here is a block diagram of something that could work for me..

I think..

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De : Mike Bryant <mbryant at futurehorizons.com>
Envoyé : 28 septembre 2023 15:40
À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>; Synth-diy at synth-diy.org
Objet : Re: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??



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 ?





________________________________

From: Synth-diy <synth-diy-bounces at synth-diy.org<mailto:synth-diy-bounces at synth-diy.org>> on behalf of Jean-Pierre Desrochers <jpdesroc at oricom.ca<mailto:jpdesroc at oricom.ca>>
Sent: 28 September 2023 20:17
To: Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org> <Synth-diy at synth-diy.org<mailto:Synth-diy at synth-diy.org>>
Subject: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz and lower.. any circuits available.. ??



Hi all,



This is an out off topics question but I will ask you anyway..

I want to build a 4 channel mixer that would receive signal  frequencies between 2Mhz and lower one channel..
These 4 frequencies won’t change. They will be fixed.

Google would give me lots of Radio/Ham solutions that imply the use of tuning coils and such things
I don’t want to get into.

The idea would be to use ready available opamps with high bandwidth
with the use of resistors and caps only. Gain would be of one.

Any idea of good components for that ?


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