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

brianw brianw at audiobanshee.com
Thu Sep 28 23:51:52 CEST 2023

Can you reduce the bandwidth to 1 MHz by mixing the signals at a lower frequency, and then shift up by 600 kHz before transmitting? I suppose you'd still need about 1.02 MHz of bandwidth, but that might be a little easier than 2.00 MHz.

On Sep 28, 2023, at 2:02 PM, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> 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 : Gordonjcp
>> Envoyé : 28 septembre 2023 16:46
>> 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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