Abstract: In order to determine the complex pulse response of a radio channel, for instance in a digital mobile radio network, signal portions of the wanted signal transmitted via the radio channel, which signal portions are preset at the receiver end, are measured and the pulse response is then calculated from the signal portions by linear transformation.

Abstract: Printing forms or metallized images can be prepared electrophotographically by a process comprising the electrostatic chargeup, imagewise exposure and tonering of a photoconductor layer applied to an electroconductive base material, followed by fixing of the tonered image areas, removal of the photoconductive layer in the non-image areas by decoating and, where appropriate, etching of the bared base material surface. A recording material is used that comprises a photoconductive layer containing at least one organic n-conducting pigment in a concentration between 10 and 50 percent by weight and an organic p-conducting photoconductor in a concentration of 0 to 20 percent by weight, based on the layer weight, together with a binder which is soluble or dispersible in aqueous-alkaline solution. The decoating is carried out with an aqueous-alkaline decoater solution, which preferably contains alkali metal hydroxides and/or phosphates.

Abstract: A pilot operated relief valve is disclosed which includes a first control space operatively connected to the inlet fluid channel, and a second control space operatively connected to the outlet fluid channel. In one embodiment, each control space is connected to a relief outlet by means of an adjustable valve, whereby the valve is adapted to operate as a pressure relief valve in either flow direction. In another embodiment, one of the control spaces is connected to the opposite channel by means of a one-way check valve, so as to function as a makeup fluid supply valve upon the pressure in the opposite channel reaching a predetermined low level.

Abstract: A pilot operated relief valve is disclosed which includes a first control space operatively connected to the inlet fluid channel, and a second control space operatively connected to the outlet fluid channel. In one embodiment, each control space is connected to a relief outlet by means of an ajustable valve, whereby the valve is adapted to operate as a pressure relief valve in either flow direction. In another embodiment, one of the control spaces is connected to the opposite channel by means of a one-way check valve, so as to function as a makeup fluid supply valve upon the pressure in the opposite channel reaching a predetermined low level.

Abstract: Pneumatic boosters basically comprise a casing and at least one movable wall disposed therein dividing the casing into two chambers. The differential of pressure between a low pressure in one of the two chambers and atmospheric pressure in the other of the two chambers provides the boosting effect. The diaphragm plate of the movable wall is normally made of relatively heavy sheet steel. According to the present invention a weight reduction and a saving of material is accomplished by providing openings in at least that portion of the diaphragm plate that extends substantially radially from the axis of the booster.

Abstract: A light weight brake booster is disclosed having an internal axial tube for transmitting axial forces with a working or boosting piston surrounding the tube and a control piston slideably guide inside the tube. These two pistons are connected by reaction levers extending through longitudinal slots in the tube. The reaction levers are pivotably supported to transmit boosting forces to a master brake cylinder and their inner ends engage the control piston to deliver a reaction force to the brake pedal to give the driver the required "brake feel".

Abstract: In a known tandem master cylinder with a regulator, machining and assembly of the parts is complicated which renders the master cylinder costly. Moreover, such an arrangement is only realizable with master cylinders having a large diameter. There are also functional disadvantages, particularly in the event of failure of one brake circuit, the brake fluid volume consumption of the other brake circuit is materially increased which results in an additional increase of the pedal travel. To avoid these shortcomings, the present invention provides a tandem master cylinder with a regulator including an arrangement, which in the event of failure of the front-axle brake circuit, mechanically actuates the regulator valve coupled to the rear-axle brake circuit by a pressure piston to keep the regulator valve in the open position to enable unreduced braking pressure to be coupled to the rear-axle brake circuit.

Abstract: In a known tandem master cylinder with two regulators for use in vehicles using diagonally split brake circuits, machining and assembly of the components is time consuming which makes the device expensive to manufacture. Moreover, the arrangement is only realizable with master cylinders having a relatively large diameter. There are also functional disadvantages, particularly that in the event of failure of a brake circuit the fluid volume consumption of the other brake circuit is materially increased which further increases the brake pedal travel. To eliminate these shortcomings, the tandem master cylinder with two regulators of the present invention includes means which, in the event of failure of a brake circuit, the regulator valve of the other brake circuit is actuated mechanically by one of the pressure pistons so that the regulator valve of the intact brake circuit is kept open to enable unreduced braking pressure to be coupled to the intact brake circuit.