Transmitters feeding a balanced transmission line will need a balun.
2.
It is typically fed at one of the two acute ( sharper angle ) vertices through a balanced transmission line.
3.
So every two-wire balanced transmission line has two modes which are nominally called the differential and common modes.
4.
The folded dipole is therefore well matched to 300 Ohm balanced transmission lines, such as twin-feed ribbon cable.
5.
An example of a transmission line modeled by this circuit would be a balanced transmission line such as a telephone line.
6.
These use balanced transmission lines to separate individual single stage amplifiers, the outputs of which are summed by the same transmission line.
7.
Balanced transmission lines of 300 Ohms or more were more-or-less standard for all shortwave transmitters and antennas in the past, even by amateurs.
8.
As UTP is a balanced transmission line, a balun is needed to connect to unbalanced equipment, for example any using BNC connectors and designed for coaxial cable.
9.
Every two-wire or balanced transmission line has an implicit ( or in some cases explicit ) third wire which may be called shield, sheath, common, Earth or ground.
10.
The transmission line is a balanced type with the input at one end and on one side only of the balanced transmission line and the output at the opposite end is also the opposite side of the balanced transmission line.
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