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

[Mike Bryant]

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.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>
Sent: 19 October 2023 12:00
To: Gordonjcp <gordonjcp at gjcp.net>
Cc: 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.. ??

> The coil in the oscillator is going to radiate far more than any
> reasonable-sized whip...

My thoughts exactly.

It's relatively easy to mix the MHz signals together with a decent CFB
op-amp, but you'll never get a compact antenna that is capable of
efficiently radiating them all at the same time!  (The OP should read
about radiation resistance, capacity top-hat and base-loading coil if
they are interested to understand why this is the case.)

-Richie,

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