Magnetic Loop “Platform” for Future Testing

A really nice remote tuning capacitor circuit for a receiving mag loop

I really like the simplicity and direct feedback of this circuit – that uses variable diodes – NTE618. The circuit can be found on this web page –

I’ve done enough testing with the loop – at its lowest usable frequency, but I only took one quick test on 40M, and they sounded dead. I will be getting the Wellbrook ALA100N preamps tomorrow, so will test after they are inline, but I also expect that a tuned circuit at the antenna will offer better multi band performance.

My goal up through last weekend was to settle on the physical characteristics of the loops – and I’m very pleased as is. What I have in the back yard is really a “platform” for further experimentation with these receiving mag loops.

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