On Jul 27, 2024, at 7:32 AM, Hiroki Kato <hiroki@...> wrote:

While taking apart a 3D printer recently, our friend Jeff Reagan, AJ6WX, discovered an interesting electro-mechanical?phenomenon. When you connect two?identical stepper motors in parallel and manually turn one motor the other motor turns?exactly the same way, clockwise or counter-clockwise. One motor works as an electric power generator and the power thus generated is sufficient to turn the other motor. Jeff thought that?such a two-motor combination may work to built a?remote?control system for a?magnetic loop. He gave me the two motors from his canniibalized 3D printer for me to experiment.

I built a prototype this week and field-tested it yesterday. Here it is. Every part of this construction is from my junk box. The reduction gear is from a WWII military radio BC348's dial mechanism. ?The capacitor is a vintage butterfly capacitor about 60 pf. ?A discerning eye may notice Erector parts, my favorite old-timer's 3D printer. The antenna covers 17, 15, 12 and 10m. The remote control worked smoothly and easy to use.?

Hiroki AH6CY

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