Friday, 26 July 2013

Magnetic loop antenna with coil tuning

Richard, PE0RIG designed a magnetic loop antenna some time ago with an original method of tuning:
A small ferrite core inside a coil realizes the magnetic loop antenne to be tuned.
No expensive vacuum glass capacitors - which are often used in this type of antennes - are required. The antenna is designed for the 80m band and is constructed in a way that portability is garanteed.
Two fixed value high capacitors (120 pF / 10 kV) are used; this type of capacitors can easily be found and are not expensive. 



Richard has used this antenna with SSB RF powers up to 100 Watts and that is a lot for this type of antennas. I would keep great distance from this antenna while using this amount of power. (Magnetic) fieldstrengths are enormous  in the near field of this antenna. Take care !



The complete story: 
http://www.v2g.nl/site/images/stories/downloads/projecten/Portable%20magnetic%20loop%20antenne.pdf

This article was published earlier in the "QRP Nieuwsbrief 132, December 2009" 

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