Magnetic Loop. How to retire capacitor?

It is known that the most valuable piece of the magnetic loop antenna is a capacitor, which must be able to handle very high voltage in case of 30+ watts of emitting power (up to 5000V for 100 watts).

The construction of the Magnetic Loop antenna is pretty simple: the one or two loops of wire (the more diameter of the wire is better) and capacitor breaking the loop. But in case of making the loop using the coaxial cable, there is an ability to retire the capacitor. The reason is simple: coaxial cable has its own capacitance. Therefore if you know the linear capacitance of your coax you can calculate the required length of the cable which creates the resonant contour on the desired frequency. Below is a sketch of the coax wiring allowing you to use both the cable shield and the linear capacitance of the coax (the image source).

Magnetic Loop. First impressions.

Yesterday I finished building my Magnetic Loop. I will provide all the details later, as soon as prepare pictures for the article. Now I would like to say the following: the tiny (in comparison to the half-wave dipole) antenna placed only two foot above the ground among a lot of trees and buildings is able to receive signals from all around the world! I tried it for transmission (FT8, driving 10 watts), but almost unsuccessfully - a lot of people heard me but only a few contacts appeared on my log. Next time I'll try to run in from the top of some building to ensure that the height of the antenna above the ground does matter.

Magnetic Loop. Calculator.

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.