Asea Brown Boveri Inc.

Bbc Brown Boveri Ag

Thomcast Ag

Juraj Tomljenovic

Bohumil Kyrian

Wilhelm Tschol

Nenad Tomljenovic

Patrick Gehri

Peter Niklaus

Narindra N Puri

Hans-Ulrich Boksberger

Modulation amplifier for radio transmitters

In the case of a high power AM radio transmitter with a tetrode as final stage tube (13), this final stage tube (13) is designed as a low voltage tetrode with a d.c. plate voltage &lt;10 kV and an plate efficiency of &gt;80%. By utilizing these measures, a compact transmitter design is achieved with virtually unchanged overall efficiency.

AM radio transmitter with a final stage tetrode

In an adjustable vacuum condenser, in which two interengaging electrode systems are arranged in a vacuum-tight housing, the upper electrode system of which is displaceably connected with the cover of the housing via a set of bellows serving as current feed, the interfering self-inductivity is reduced by adapting the outside diameter of the set of bellows and the inside diameter of the electrically conducting jacket surrounding the set of bellows to one another.

Adjustable vacuum condenser

Growing community of inventors

Tegerfelden, Switzerland

Juraj Tomljenovic