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Especially if you put all four coils on a ferrite rod. I assume they still make those even though AM radios aren't as common as they used to be.<br>
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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 rburnett@richieburnett.co.uk <rburnett@richieburnett.co.uk><br>
<b>Sent:</b> 19 October 2023 12:00<br>
<b>To:</b> Gordonjcp <gordonjcp@gjcp.net><br>
<b>Cc:</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>
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<div class="PlainText">> The coil in the oscillator is going to radiate far more than any
<br>
> reasonable-sized whip...<br>
<br>
My thoughts exactly.<br>
<br>
It's relatively easy to mix the MHz signals together with a decent CFB <br>
op-amp, but you'll never get a compact antenna that is capable of <br>
efficiently radiating them all at the same time! (The OP should read <br>
about radiation resistance, capacity top-hat and base-loading coil if <br>
they are interested to understand why this is the case.)<br>
<br>
-Richie,<br>
<br>
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