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

Jean-Pierre Desrochers jpdesroc at oricom.ca
Fri Sep 29 23:12:43 CEST 2023


I like your post Roman..

JP


> -----Message d'origine-----
> De : Roman Sowa <modular at go2.pl>
> Envoyé : 29 septembre 2023 06:14
> À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> Cc : Synth-diy at synth-diy.org
> Objet : Re: [sdiy] 4 channel mixer of signals with frequencies between 2Mhz
> and lower.. any circuits available.. ??
> 
> Come on, this is basicaly almost a DC signal, let's not overkill this!
> I especially liked as someone joked about doing it digitally in FPGA.
> 
> In the old days of analog television, this was called "video bandwidth"
> and what comes wit it - huge variety of video opamps, with enough power,
> bandwidth and low distortion to use in such scenario. My prefered all-purpose
> models were AD818 and AD817, but that was 25 years ago.
> Nowadays there should be hundreds of better and cheaper opamps. Just build
> resistive adder like you would do for CV in modular synth, the only difference
> being resistor values to provide matched load impedance for individual
> transmitters. The opamp will provide enough gain and output power to drive
> antenna directly with those few miliwatts.
> 
> Roman
> 
> 
> W dniu 2023-09-28 o 23:02, Jean-Pierre Desrochers pisze:
> > Here is what I'm trying to do as an experiment.
> >
> > I have 4 small AM transmitters transmitting at 600, 900, 1200 and 1600Khz.
> > At about 10mW of power each.
> > I was thinking about mixing the 4 frequencies as a single unit
> > that I could adjust the final output transmitted on a small antenna.
> > That's my idea so far..
> >
> >
> >> -----Message d'origine-----
> >> De : Synth-diy <synth-diy-bounces at synth-diy.org> De la part de Gordonjcp
> >> Envoyé : 28 septembre 2023 16:46
> >> À : synth-diy at synth-diy.org
> >> Objet : Re: [sdiy] 4 channel mixer of signals with frequencies between
> > 2Mhz
> >> and lower.. any circuits available.. ??
> >>
> >> On Thu, Sep 28, 2023 at 03:17:56PM -0400, Jean-Pierre Desrochers wrote:
> >>> 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.
> >>
> >> For the avoidance of the XY Problem, what exactly are you trying to do?
> >>
> >> --
> >> Gordonjcp
> >>
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