This is dedicated to everyone interested in building or learning Magnetic Loop Antennas, or MagLoops.
There is a lot of articles and videos on the Internet about building, tuning, and designing MagLoops. Using the link below you can navigate to the Magnetic Loop Calculator - very simple yet useful tool allowing you to be one step closer to be the owner of the MagLoop.
I have played a little with this calculator and noticed that using the single 3 meters (9.8 feet) long loop magnetic antenna you can cover bands from 14 to 24 MHz using the only one 25-80 pF capacitor. Also, calculations are accompanied by some useful advises allowing you to select more correct dimensions.
Also, I have watched some videos and noticed two- and even three-loop magnetic antennas covering the much wider frequency range using the same not a very big capacitor. The only thing you have to keep in mind: the capacitor must have the air between its plates corresponding to the power you are going to apply to the antenna - the more power is being emitted of your transmitter, the more space should be between plates.
The best choice is a vacuum capacitor - the dielectric is much better than in case of the air. But these capacitors are much expensive and fragile than their fully-metal friends.
There is a lot of articles and videos on the Internet about building, tuning, and designing MagLoops. Using the link below you can navigate to the Magnetic Loop Calculator - very simple yet useful tool allowing you to be one step closer to be the owner of the MagLoop.
I have played a little with this calculator and noticed that using the single 3 meters (9.8 feet) long loop magnetic antenna you can cover bands from 14 to 24 MHz using the only one 25-80 pF capacitor. Also, calculations are accompanied by some useful advises allowing you to select more correct dimensions.
Also, I have watched some videos and noticed two- and even three-loop magnetic antennas covering the much wider frequency range using the same not a very big capacitor. The only thing you have to keep in mind: the capacitor must have the air between its plates corresponding to the power you are going to apply to the antenna - the more power is being emitted of your transmitter, the more space should be between plates.
You even can use a piece coax as a capacitor. But in this case, you won't be able to change the resonant frequency and, therefore, the effectiveness of the antenna will degrade near the bandwidth borders.
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