Abstract: According to the invention, an antenna curtain, particularly a dipole curtain of an antenna in the decametric wave range is formed of a plurality of cables. Radiators are provided arranged essentially in a vertical plane, defining a radiator plane, in a plurality of rows located one atop another and in one column or in a plurality of columns next to one another. A line system device is provided for feeding the radiators of each column through conductive lines. A single catenary is provided to provide sufficient tension for the vertical or slightly inclined lines of the line system. An approximately horizontal spreader is arranged above each of the columns essentially perpendicularly to the radiator plane. The horizontal spreader is positioned beneath the catenary and above the topmost radiator, preferably spaced a small distance in height above the topmost radiator.

Abstract: A power amplifier for amplifying analog input signals includes one or a plurality of amplifier modules which are connected in series on their output sides, which preferably each include a double mains unit having three outputs and a mains transformer connected in a wye pattern on its secondary side, with the two outer outputs each being connected by way of a main switch with the filter choke of a lowpass filter and by way of a free running diode connected between the main switch and the filter choke with the middle output while the middle output, in turn, is connected directly with the secondary side wye point of the transformer and, on the other hand, directly with the junction of the two series connected filter capacitors of the two lowpass filters.