Radio frequency power transmission

As Reuse line refers to a special type of an overhead line to supply power to antennas of large stations in long and medium waveband.

Construction

A Reuse line consists of an annular array of outer conductors that are connected to the earthing system. Inside the array, separated by insulators of the outer conductors conductor of the inner conductor are attached.

Function

The operating principle of a fish trap line corresponds to a coaxial cable, that constructive only this line is executed as an overhead line and the electrical conductors consist of single conductor cables and are not designed as hollow tubes. Hochleistungskoaxialkabeln as outer and inner conductors are held by spacers at a constant distance. This spatial distance and the ratio of the diameter of the inner and outer conductor substantially determine the characteristic impedance of a line Reuse.

Properties

Due to the large spatial distances between the individual conductors in the outer and inner conductor to Reuse cables are suitable only for low frequencies in the long and medium wave range up to frequencies of a few MHz.

As with a coaxial cable of the transport of high-frequency power in the field space between the outer conductor and the inner conductor is done. Since this space between the conductors, except for the small insulators to ensure equal biological forming spacing of the conductors to each other, is filled with air and air has only a small loss factor, large high-frequency performance can be transmitted up to the megawatt range with Reuse lines. An example is the transmitter Wachenbrunn in Thuringia, which was fed by the year 2003 with an output power of 1 MW over a fish trap line.

New plants

Even with some new transmitters, the antenna feed lines run as Reuse line, as in the long-wave transmitter of 252 in Atlantic Clarkestown, Ireland, and the long-wave transmitter of the Polish Radio in Solec Kujawski.