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Check these two types of dipole and tell me in english...! (Language problem!)

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Willen

Well-Known Member
I want to understand all the details written inside here:
https://pira.cz/adipol.htm
but which language is this??? There are easy trick to make coax BalUn. Please anybody tell me the details about length, impedance and all who is familier with this language. (describe two dipole images in brief shown there.)
 
Using Google translate:Czech Language

Half-wave dipole is the basis for most antennas. Its basic feature is the length equal to half the wavelength and gain 0 dBd (2.15 dBi). Power of the dipole is symmetrical, so you can not directly connect the coaxial cable, but this brings problems.

dipol2.gif (1368 bytes) In practice, most are two types, namely open and folded dipole dipole. Folded dipole in free space impedance is 300 ohms, 75 ohms open. Profit is exactly the same, but folded dipole can be used on a larger range of frequencies is širokopásmovější.

On the right is shown how to implement the folded dipole. Ground condition is not indicated, but the storm can help. It is a good grounding coax dipole and connect with grounded mast, on which the dipole is fixed. Sometimes with small ferrite dipole matching member, which is definitely for broadcast use, and use a loop of coax. Open dipole is quite different not only design, but also the way location and coax connections. Impedance 75 ohm dipole open often brings coax cable for direct connection to the terminals. However, this could be a source of problems because the dipole is electrically symmetric, but not coax. Therefore, there must also use a special adjustment loop. Some sources indicate the possibility of symmetrization by simply twisting a few turns of coax supply close to the dipole. The FM is a method by itself quite insufficient, especially for higher performance.

dipol3.gif (1351 bytes) Dipole can be mounted in several ways. They are either mounted on a wooden, plastic or other non-conductive metal rod or pole. In both cases, it is particularly important that the cable was kept perpendicular to the dipole. Fixing the non-conductive rod brings great difficulty, if not subject to special requirements for mechanical resistance, it is sufficient dipole chain with tape. The metal pole is different, dipole must be from the mast at a distance, which is 0.2 to 0.3 wavelength. Also there is a deformation of the radiation diagram, so the dipole toward the mast will be less revenue, while in the opposite direction of the profit increase. In practice it is most convenient. dipol.jpg (13272 bytes)

Using a dipole for FM radio broadcasting to consider generally the best choice. Folded dipole you simply buy that ring, that are everywhere, and straighten it :
 
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