Siemens Aktiengesellschaft

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Gustav Schumacher

Friedrich Schumacher

Gustav Schumacher, Ii

Guenther Herbster

A system for phase trimming of feeder cables, which are used for driving an antenna system uses a transmission pilot tone. A pilot tone device, which is arranged on the transmission side, produces the transmission pilot tone, which is input into each individual one of the feeder cables and is in each case passed, as a received pilot tone, to an output device which is connected upstream of the antenna system. Using the latter, the pilot tone is output from the respective feeder cable, and is processed further in order to determine phase differences between the feeder cables. The phase differences between the feeder cables determined in this way are compensated for by a trimming device, which is arranged between the input device and the feeder cables.

System for phase trimming of feeder cables to an antenna system by a transmission pilot tone

A control system for the linearization of an amplifier circuit having a power amplifier operating in the non-linear region for the amplification of an RF input signal. In a modulator a local oscillator is derived from a coupled-out input measurement signal. In a mixer, the local oscillator signal is mixed with the input and output measurement signal to form a respective intermediate-frequency signal. In a detector, level signals are derived from the intermediate-frequency signal and are compared in an amplitude controller. A derived amplitude control signal controls an amplitude controlling element for the linearization of the amplification of the input signal.

Control system for the linearization of an amplifier circuit

A sieve for separating grain crops from a chaff-straw mixture, used in agricultural harvesting machines, particularly harvester threshers and which is passed from below by a blower wind current includes alternating elongated grooves and channels aligned in parallel relative to the crop conveying direction. The grooves and channels are alternately open on the top or on the bottom, respectively, and have lateral legs with openings, through which the crop can pass from the grooves open on the top to the channels open on the bottom.

Sieve for harvesting machines

A cleaning sieve assembly disposed at the end of and below a transporting conveyor of the harvested crop in the harvesting machine includes an upper or shaff sieve and a lower sieve both subjected to an air current blown from a blower. The upper sieve includes a plurality of inclined sieve zones, which may be descending or ascending in respect to the plane of the sieve with the inclination which is adjustable.

Cleaning sieve for the harvested crop of agricultural machines

The invention concerns a coupling for connecting hydraulic lines having a first coupling part 1 with a first valve 6, which is received into a housing 3, and including means for receiving a second coupling part 2, which includes a second valve 64. The truncated conical valve body 30 of first valve 6 is urged in the closing direction by a separate closing spring 33. Valve body 30 of first valve 6 is then penetrated by an actuator, which is adjustable in the direction of second valve 64, and which actsacross an actuating surface cooperatively with an actuating shaft 7 disposed diagonally to the valve axis and penetrates housing 3 of first coupling part 1, which actuating surface, on the one hand, acts on valve body 30 of first valve 6 and, on the other hand, on an actuator 35. The actuator 35 is urged toward actuating surface 22 by means of an opening spring 37 supported by valve body 30. In order to attain a simplified assembly, the actuating surface is part of a separate actuating member 18, which is attached non-rotatably to an actuating shaft 7, which is divided into two partial shaft pieces 8, 9.

Coupling for connecting hydraulic lines

Frequency synthesizer for use in the microwave range and that operates according to the indirect principle contains a reference frequency branch in which the reference frequency is derived from a crystal-stable fundamental frequency on the basis of multiple frequency multiplication and intermediate filtering one or more PLL segments cascaded according to the divide and mix principle, each of these PLL segments having an offset mixing stage for mixing the reference frequency with an offset frequency, an intermediate frequency mixing stage for mixing the filtered-out aggregate or difference frequency with the frequency of a pretunable, voltage-controlled oscillator into the intermediate frequency level, and a screen mixing stage for mixing the intermediate frequency with a comb line frequency corresponding to a multiple of the fundamental frequency for the purpose of generating an error signal for a phase frequency detector whose reference is a suitably divided fundamental frequency and whose output signal, after comparison, forms the control voltage for a voltage-controlled oscillator. The frequency synthesizer is suitable for a low-noise carrier supply that is capable of extremely fast frequency changes, this enabling its use in, for example, frequency-agile radar equipment.

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Munich, Germany

Friedrich Schumacher