Magnetic Loop.
Hi i have built a .9 meter m l a with a air spaced cap to tune said 2 turn loop, works well as i can null out most qrm, on tx i can get almost 1 to 1.Tuning is very sharp around 10khz on rx even sharper on tx so i fitted a slow rpm motor so i can tune remotely ok the tuning is ok BUT as soon as i connect the dc supply wire noise goes up even without being connected to a power unit (6v battery) the motor and connections to it are inside the loop, so how to remove the qrm being picked up by the 2 core wire to the motor maybe rf choke and caps like a wave trap idea what do others think. by the way the improvement is like chalk and cheese b4 s9+5 with loop s4 will right up details if any interest Mick
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