balancing device. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / HF antennas
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Many radio amateurs use symmetrical antennas - dipoles, squares, etc. - to operate on the air, feeding them with an unbalanced coaxial cable under these conditions, the cable does not fully show its shielding properties: during transmission it radiates energy, and in reception mode it receives signals (and interference) from all directions. In order to eliminate this effect, balancing devices are used, which are connected between the cable and the antenna. In English, such a device is called BALUN from the words "BAlanced-UNba lanced", i.e. "symmetrical - asymmetrical. There are many varieties of balancing devices. One of them, quite simple and effective, was described by V. Zalnerauskas (UP2NV):
"... The design of a balancing transformer is extremely simple. A segment of the same coaxial cable 1-1,5 m long is connected to the main feeder (see figure), and the two-cable part of the feeder is wound on a large-sized ferrite ring. If the two-cable part of the feeder is on one ring does not fit, you can put together several rings of the same size.You can use ferrite rings of any brand of magnetically soft ferrites with a permeability of 400.. 2000 ".
According to UP2NV, tests of such a balancing device have shown that it works well in the frequency range from 2 to 30 MHz. Note that this device does not change resistance (it is a transformer with a ratio of 1:1), i.e. it can be connected to your existing symmetrical antennas without changing anything in their design.
Author: V. Žalnerauskas (UP2NV); Publication: cxem.net
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