Abstract: In a radio receiver, the receive signal is conditioned in parallel in at least two paths, in one path a first mixing oscillator signal lying above a channel center by an absolute value, and in a second path a second mixing oscillator signal lying below the channel center by an absolute value, and furthermore, special components are able to be filtered out using filters, and subsequently the signals are conditioned and/or combined in a suitable manner.

Abstract: To avoid intermodulation interferences, a varactor diode alternative circuit has at least three varactor diodes connected in series alternatingly opposite to one another and a resistor and/or inductor network. At each of the varactor diodes, a control voltage supplied to the circuit for adjusting capacitance is at least approximately at full extent. An alternating voltage applied at the series connection, which is at a higher frequency than the control voltage, is distributed at least approximately uniformly to the varacter diodes. Even for an at least not substantially larger tuning voltage than the amplitude of a signal voltage to be processed in the oscillator circuit that has the alternative circuit, reactions of the signal voltage on the set capacitance of the varactor diode alternative circuit remain negligible, or at least low. The circuit may be used in an electrical, e.g., battery-operated, unit in which only one small operating voltage is available.

Abstract: A radio receiver system, having two receiving antennas, two receivers, and a transformer transmitter, which is provided for the purpose of supplying radio signals of both antennas to each of the receivers, the transformer transmitter having a first winding and a second winding, wherein the two receiving antennas are connected to the end terminals of the first winding, and a first of the two receivers is connected to a center tap of the first winding and the second of the two receivers is connected to an end terminal of the second winding.

Abstract: A radio receiver system, having two receiving antennas, two receivers, and a transformer transmitter, which is provided for the purpose of supplying radio signals of both antennas to each of the receivers, the transformer transmitter having a first winding and a second winding, wherein the two receiving antennas are connected to the end terminals of the first winding, and a first of the two receivers is connected to a center tap of the first winding and the second of the two receivers is connected to an end terminal of the second winding.

Abstract: An antenna amplifier includes at least one input for connecting to an antenna and at least one output for connecting to a receiver, as well as at least one means of signal-level matching positioned between the input and the output. The antenna amplifier improves the noise-to-useful signal ratio, in particular in situations in which a noise signal having a high level is applied, by providing a narrow-band filter situated between the input and the means of signal-level matching, with the mid-frequency of the filter passband being able to be changed and tuned to the receive channel of the receiver.

Abstract: A system for connecting at least two receivers to a common antenna is proposed, antenna signal lines being supplied to the receivers, which stands out in that the input impedances of the at least two receivers are matched only in a narrow-band fashion in the range of their current reception frequencies to the impedances of the antenna signal lines supplied to them. An antenna signal splitter is also proposed. Finally, a method for controlling the reception frequencies of at least two receivers connected to a common receiving antenna is proposed, which is distinguished by the fact that the reception frequencies of the at least two receivers are set in such a way that they maintain a predefined minimum frequency distance from one another. A reduction of an antenna signal attenuation in an antenna signal splitter for multiple receiver systems is thereby possible, provided the receivers are tuned to different reception frequencies.

Abstract: A varactor diode alternative circuit having at least three varactor diodes that are in each case connected in series alternatingly opposite to one another and a resistor network and/or inductor network, which has the effect that at each of the varactor diodes, a control voltage supplied to the circuit for adjusting the capacitance is present at least approximately at full extent, and an alternating voltage that is applied at the series connection of the varactor diodes, which is at a higher frequency compared to the control voltage, is distributed preferably at least approximately uniformly to the varacter diodes.

Abstract: A radio receiver system having a plurality of receiving antennas and a plurality of receivers is described in which antenna signals of a multiplicity of the plurality of receiving antennas are fed to each of the plurality of receivers. The plurality of receiving antennas may be interconnected to the plurality of receivers more flexibly as a function of the desired reception strategy. In addition, the functionality of the entire system may also be maintained in the event of a defect or failure of one or more receiving antennas.

Abstract: A method for operating a plurality of subscribers (X1, . . . , X4; Y1, . . . , Y4; Z1, . . . , Z4, B, C1, C2, D, E) that are connected to a serial bus, the bus including at least one address line for addressing the subscribers (X1, . . . , X4; Y1, . . . , Y4; Z1, . . . , Z4, B, C1, C2, D, E). In order to create as simple as possible and as cost-effective as possible a possibility of being also able to operate such subscribers as are originally addressed via the same address, it is provided that at least those subscribers (X1, . . . , X4; Y1, . . . , Y4; Z1, . . . , Z4, C1, C2) who originally are addressed via the same address be connected in series to the address line (3), and the address for the postconnected subscriber(s) (X2, . . . , X4; Y2, . . . , Y4; Z2, . . . , Z4; C2) be transmitted via the preconnected subscriber(s) (X1; Y1, Z1; C1).

Abstract: A radio apparatus (95), particularly for mobile radio, which makes it possible to adjust the signal reception in a predeterminably optimized way is proposed. The radio apparatus (95) includes a receiver part (1) and an evaluation unit (5), which controls the sensitivity and/or the signal-to-noise ratio of the receiver part (1) as a function of a predeterminable signal reception quality and the actual signal reception. In the event of defective signal reception, the evaluation unit (5) increases the sensitivity and/or the signal-to-noise ratio of the receiver part (1), and when signal reception is error-free for a predeterminable time it reduces the sensitivity and/or the signal-to-noise ratio of the receiver part (1).

Abstract: A radio receiver system having a plurality of receiving antennas and a plurality of receivers is described in which antenna signals of a multiplicity of the plurality of receiving antennas are fed to each of the plurality of receivers. The plurality of receiving antennas may be interconnected to the plurality of receivers more flexibly as a function of the desired reception strategy. In addition, the functionality of the entire system may also be maintained in the event of a defect or failure of one or more receiving antennas.

Abstract: A system for connecting at least two receivers to a common antenna is proposed, antenna signal lines being supplied to the receivers, which stands out in that the input impedances of the at least two receivers are matched only in a narrow-band fashion in the range of their current reception frequencies to the impedances of the antenna signal lines supplied to them. An antenna signal splitter is also proposed. Finally, a method for controlling the reception frequencies of at least two receivers connected to a common receiving antenna is proposed, which is distinguished by the fact that the reception frequencies of the at least two receivers are set in such a way that they maintain a predefined minimum frequency distance from one another.

Abstract: Method for controlling the power gain for outputting a transmitted signal from a radio device. At the beginning of the transmitted signal, the output power is increased to a preset power level along a preset characteristic curve. At the end of the transmitted signal, the preset power is decreased along the preset characteristic curve. The power gain is controlled accordingly by a control signal (8, 9). A reference control signal (5) is used for the rising and falling edges of the control signal (8, 9). The control signal (8, 9) is limited to a preset maximum control signal value (6, 7).

Abstract: A radio receiver (1), in particular a car radio, is proposed, which is used for a space-saving feed-in of an antenna cable (15). A radio telephone (30) is integrated into the radio receiver (1). An antenna connector (5) is provided on a rear or lateral wall (10) of the housing of the radio receiver (1). The antenna connector (5) for the antenna cable (15) extends in a parallel direction or a narrow angle in respect to the rear or lateral wall (10) of the housing. The antenna connector (5) is arranged in a bulge (45) of the rear or lateral wall (10) of the housing.