Loop antenna for medium wave with remote tuning

A tuned loop is a very effective antenna for medium wave reception in an area with man-made noise. However, using such a loop in close proximity to a laptop computer with an SDR (software-defined radio) is not a good idea because the loop will pick up interference from the computer. Therefore I decided to build a loop antenna with remote tuning by varicaps (varistors if you prefer that term), picking up the idea from T.J. Nelson’s article. That way you can move the loop antenna to a spot further from the computer and possibly a spot with lower interference. Outside is best, so I’ll be aiming to build something that can withstand inclement weather (within reason!).

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A bottle and stairs

One of those days where there doesn’t seem to pop up anything worth photographing and just when I was about to give up, this scene presented itself.