Build a simple magnetic loop antenna.

Β This article is a reprint from my original article published in 2004. I don’t use the antenna anymore (collecting dust in the basement) but the article will stay here for informational purposes.

I live in an appartment and don’t have the space to put up a large antenna for my Kenwood R1000 receiver.
I knew the excistance of magnetic loops, but I never spent time to take a look at it. Why ? Who knows.

For the main loop I used a soft copper tube, diameter is 10 mm, length about 3 meter.
Try to make a circle (not always easy). A friend of me, Carl ON7NH, has drilled and tapped M3 tread into it. This makes it possible to use solder lips. The entire loop is constructed on a sunday afternoon.
The smaller loop is about 60 cm in length (diameter 1/5 of the main loop), material is 1,5 square mm copperwire.

With the capacitor found in my junkbox, I can tune the loop from 2,9 Mhz till 10 Mhz. Other capacitors will give other tuning ranges, have to experiment here.

5 Comments on “Build a simple magnetic loop antenna.”

  1. Cheers mate, long time no see!

    Nice to see that you are experimenting with magloop again. We also did some testing
    last saturday and compared an groudn mounted GP and magloop on 20 meters.

    The results were quite promising and “real report” A/B test with few stations gave similar
    results from both antennas. I built quite unigue capacitor for this magloop and I might
    even put the details to my website after I’ve finnished the remote cotrolleing mechanism.

    Have you ever tried to do any comparisons? Using thicker materials, bigger loop, soldered connections and
    good capacitor might give you better results.

    73 de Janne, OH1SDR (ex. OH1GTF)

    1. Hi Janne,

      the article is rather old, but was still on my old site. At the time I wrote the article I had no antenna at all. I built the loop to see if it was something I could use. The only receiver I had was my old Kenwood R1000. I was happy enough to hear something πŸ™‚

      About 1,5 year ago I started building a loop from coax cable (don’t know the size, but it was about 4 cm in diameter) that I had found near the road. It was a leftover from a contruction site, but still a good 9m long. My goal was to make a horizontal loop. But the coax was way to heavy. I started over with a square loop in Al made from DIY parts. The side was now 3m. But I never finished it. All the parts are at my parents garage.

      I will proceed with the experiments later. I can get a vacuum cap from a friend of me. But I moved house. We sold our appartment (to my parents in law) en bought a house. All my activities stopped earlier this year (feb 2009) and we moved in june. Now is the time that everything is falling in place and I hope to gain more time for the hobby. No antenna at all. It’s difficult sometime to be silent πŸ™‚

  2. Hi,

    I’m interested to know about your experiences on F/S performance. Can you blend out any disturbing signals from unwanted directions to clear up the wanted signal?
    73 Mark, PA5MW

    1. Hi Marc,

      I have to test that again, I had no other antennas to compare with. See my reply to Janne and you see why. The antenna was placed on the window frame, rotating would result in the antenne falling to the floor πŸ™‚ I did made some PSK31 contacts but only with the stronger stations.

  3. Wonderful! Thanks for the great images, which really help people like me, strating out on amateur radio and trying to have some building fun whilst also saving money!

    Site like this are invaluable!

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