Abstract: A pneumatic supply device for an agricultural tractor includes a compressed air source for producing a compressed air flow, a cooler for cooling the air flow produced, and a first air dryer, which is fed with the cooled air flow and via the outlet of which a first pneumatic consumer group can be supplied with dehumidified compressed air in accordance with a first dehumidification and flow capacity, and a second air dryer, which is fed with the cooled air flow and via the outlet of which a second pneumatic consumer group can be supplied with dehumidified compressed air in accordance with a second dehumidification and flow capacity.

Abstract: A method for assisting a coupling operation to be carried out at a three-point powerlift of an agricultural tractor includes determining via a control unit in communication with an imaging device using image capture and analysis a spatial actual position of implement-side coupling points of the implement interface relative to the tractor-side coupling points, steering via the control unit the agricultural tractor along a predetermined trajectory into an end position provided for the attachment of the implement, and activating via the control unit the actuator arrangement in accordance with the course of the predetermined trajectory such that the tractor-side coupling points take up a spatial desired position provided for attaching the implement-side coupling points.

Abstract: A near field communication (NFC) system includes a plurality of coils for coupling to an antenna of a portable device, wherein each two adjacent coils are partly overlapped with one another; a multiplexer selectively enabling at least one of the coils to build a communication with the antenna, wherein the coils enabled by the multiplexer are selected to have a best coupling effect with the antenna and are combined into an effective antenna; and at least one adaptation network for adapting an input/output of the effective antenna.

Abstract: An expansion bolt including an anchor bolt having an expansion section, and further including an expansion sleeve which surrounds the anchor bolt and which can be expanded by retracting the expansion section, and a spring element arranged on the anchor bolt. The spring element can be tensioned by inserting the anchor bolt into a bore hole and can retract the expansion section of the anchor bolt into the expansion sleeve when it is released. An indicator element indicates when a rated tension of the spring element is reached.

Abstract: A near field communication (NFC) system includes a plurality of coils for coupling to an antenna of a portable device, wherein each two adjacent coils are partly overlapped with one another; a multiplexer selectively enabling at least one of the coils to build a communication with the antenna, wherein the coils enabled by the multiplexer are selected to have a best coupling effect with the antenna and are combined into an effective antenna; and at least one adaptation network for adapting an input/output of the effective antenna.

Abstract: A method of monitoring a plurality of strings of a photovoltaic system connected to a power inverter includes measuring current values from individual strings to the power inverter; determining a reference current value from the measured current values; and standardizing the measured current values to the reference current value. The method further includes and analyzing the standardized current values of individual strings within representative time periods by comparison with comparison values established for the individual strings. Based on the analysis a failure of an individual string is ascertained.