Abstract: A bias circuit for a radio frequency linear power amplifier includes an input for selecting an operating mode varying in quiescent current of an output transistor. A sensor senses a current through the output transistor and a circuit biases the output transistor for maintaining linear performance in each of mode over a range of temperatures. A filter attenuates noise generated within the linear power amplifier. A tank circuit at the collector of a power radio frequency transistor, having an inductor capable of handling the collector current, resonating with a capacitor at the design frequency, permits a reduction in the required inductance and therefore higher levels of integration.

Abstract: A bias circuit for a radio frequency linear power amplifier includes an input for selecting an operating mode varying in quiescent current of an output transistor. A sensor senses a current through the output transistor and a circuit biases the output transistor for maintaining linear performance in each of mode over a range of temperatures. A filter attenuates noise generated within the linear power amplifier. A tank circuit at the collector of a power radio frequency transistor, having an inductor capable of handling the collector current, resonating with a capacitor at the design frequency, permits a reduction in the required inductance and therefore higher levels of integration.

Abstract: A bias circuit for a radio frequency linear power amplifier having an input for selecting one of a plurality of operating modes varying in quiescent current of an bipolar transistor, a thermally responsive element for sensing a temperature, a circuit for biasing the output bipolar transistor, receiving said selecting input and incorporating said thermally responsive element, for maintaining linear performance in each of said modes over a range of temperatures, and a filter 6, 41, 42, 43 for attenuating noise generated within the linear power amplifier. The use of a tank circuit at the collector of a power radio frequency transistor, having an inductor capable of handling the collector current, resonating with a capacitor at the design frequency, permits a reduction in the required inductance and therefore higher levels of integration.

Abstract: A bias circuit for a radio frequency linear power amplifier having an input for selecting one of a plurality of operating modes varying in quiescent current of an bipolar transistor, a thermally responsive element for sensing a temperature, a circuit for biasing the output bipolar transistor, receiving said selecting input and incorporating said thermally responsive element, for maintaining linear performance in each of said modes over a range of temperatures, and a filter 6, 41, 42, 43 for attenuating noise generated within the linear power amplifier. The use of a tank circuit at the collector of a power radio frequency transistor, having an inductor capable of handling the collector current, resonating with a capacitor at the design frequency, permits a reduction in the required inductance and therefore higher levels of integration.

Abstract: A mixer feeder wagon (1) for mixing animal feed which includes hay, straw, silage and the like, including a mixing compartment (20) and a dispensing compartment (21). A mixing rotor (30) is rotatable in the mixing compartment (20) for mixing the animal feed, and a dispensing auger (38) in the dispensing compartment (21) dispenses the mixed animal feed through a dispensing outlet (22). A plurality of first blades (55) extend radially from mixing paddles (47) of the mixing rotor (30) and co-operate with a plurality of second blades (56) which are mounted on a base (12) of the mixing compartment (20) for cutting the fibrous material of the animal feed into relatively short lengths as the mixing rotor (30) rotates.

Abstract: A spreader wagon (1) comprises a container (10). A dispensing rotor (30) is rotatable in the container (10) for dispensing material through a dispensing outlet (21). A piston plate member (45) is movable within the container (10) for urging material into engagement with the dispensing rotor (30). An inner separating member (75) and an outer separating member (76) are rotatably mounted on the dispensing rotor (30) for separating material from the mass of material in the container (10) for dispensing through the dispensing outlet (21). A drive transmission interconnects the dispensing rotor (30) and the inner and outer separating members (75,76) so that the separating members (75,76) rotate relative to the dispensing rotor (30) as the dispensing rotor (30) rotates.

Abstract: A spreader wagon (1) comprises a container (10) for material to be spread. The container (10) is formed by a semi-circular base (14) and side walls (15) and (16) and a downstream end wall (17). A dispensing rotor (30) rotatable in the downstream end (12) of the container (10) dispenses material through a dispensing outlet (19). A piston plate member (45) extending transversely of and slidable in the container (10) from the upstream end (11) to the downstream end (12) retains the material in the container and urges the material into engagement with the dispensing rotor (30). An isolating plate (55) slidable in tracks (57) is lowerable into a closed position for isolating the dispensing rotor (30) from an upstream portion (56) of the container (10) for retaining the material out of engagement with the dispensing rotor (30) until the dispensing rotor (30) has been run up to speed.

Abstract: A hopper is adapted to be mounted on the three-point suspension system of an agricultural tractor by pivoting the lifting links to pivots immediately beneath the hopper body which has downwardly extending arms to which are pivoted a link pivotally connecting same to the anchor pin from which the usual stabilizing link of the tractor is removed. This construction gives a four-bar chain with crossed links whereby the hopper may be raised from a horizontal position to an upright position (or vice versa) by operating the lifting links. The construction is also capable of adjustment. The contents of the hopper can be discharged in bulk or dispensed laterally by an archimedean screw located in the bottom of the hopper.