Abstract: The invention concerns a method for analysing an OFDM signal (rIF(t)) transporting a series of data symbols on several orthogonal carrier frequencies, each data symbol having a useful part separated by a guard period from neighboring data symbols, with an analysing device (40) having a signal section (20) with a bandwidth (BWA) smaller than the bandwidth (BWOFDM) of the OFDM signal. The method comprises the steps of low pass filtering of the OFDM signal with a low pass filter (24) and shifting (26) the spectrum of the OFDM signal in order to obtain a frequency shifted filtered OFDM signal (r(i)), whereby the length of the impulse response of the low pass filter (24) is shorter than the length of the guard periods of the data symbols.

Abstract: An apparatus for providing Phased-Locked Loop (PLL) synthesis comprises a phase detector, at least one switchable filter, an oscillator controlled by a control voltage (uPLL) and a divider. The controlled oscillator has two inputs, wherein the control voltage (uPLL) is coupled to a first input, and a selection voltage (uSET) for rough frequency adjustment is coupled to a second input. Both voltages establish the frequency of the oscillator.

Abstract: The invention relates to a magnetically tunable filter having a filter housing and having two tunable resonator spheres which comprise magnetizable material and are arranged next to one another in two filter branches. Each filter branch comprises a coplanar line arranged on a substrate layer and extending in the direction of an electrical connection, as well as a common coupling opening so that the two filter branches are connected to one another. A resonator sphere is respectively positioned on each side of the coupling opening inside the two filter branches.

Abstract: In an electronic high-frequency switch, comprising a field-effect transistor as the switching element, the size of the gate voltage may be switched between at least two values (?5.5 V and ?8 V), according to the desired linearity or switching speed. The switching device for the gate voltage is preferably coupled to a correction device in which different correcting values for the different gate voltage values corresponding to different correcting values for transmission or reflection by the high frequency switch are stored.

Abstract: To achieve a synchronous output of analog signals generated in two or more digital-to-analog (DAC) converters, an adjustable, digital delay device, of which the delay time is adjustable dependent upon the cross-correlation determined between the analog output signals of the digital-to-analog converters, is provided upstream of at least one of the fifo memories provided for the signal transfer in order to delay the digital signal.

Abstract: A signal generator includes a baseband unit, generating a digital, and an I/Q modulator, modulating the digital baseband signal. A storing memory stores a time slot of said digital baseband signal and an optical display unit represents the digital baseband signal stored in said memory according to a predetermined representation mode.

Abstract: Electrical switching device, especially a high-frequency switching device, with at least one oblong electrical switching element, which is arranged with one contact end between two fixed-contact elements spaced a transverse distance from one another and can be moved by two adjustment elements forming a transverse movement drive transversely to a longitudinal direction optionally towards the one or the other fixed-contact element. The adjustment elements are disposed laterally alongside the switching element and can be moved transversely to and from the switching element. In order to improve the transverse movement drive for the switching element, the switching element-comprises magnetic material, wherein the adjustment elements are formed by magnets.

Abstract: In a controller-assisted device for determining a characteristic of a compensation element in a level control circuit, the compensation element is serially mounted inside the level control circuit for a high-frequency signal (S<SB>HF</SB>) in a signal channel with respect to said signal channel. The characteristic of the compensation element has a characteristic which the inverse of the non-linear transmission characteristic of the signal channel in the event of ideal compensation. In the controller-assisted method for the determination of a characteristic of the compensation element in a level control circuit, each ordinate value of the characteristic of the compensation element arises, in the event of a bridged compensation element, from the corrective signal value (Pastel) which is adjusted at a signal level of the level reference signal (Pref) in the adjusted level control circuit, corresponding to the associated abscissa value of the characteristic of the compensation element.

Abstract: A method for testing the error ratio BER of a device under test against a specified allowable error ratio comprises the steps: measuring ns samples of the output of the device, thereby detecting ne erroneous samples of these ns samples, defining BER(ne)=ne/ns as the preliminary error ratio and deciding to pass the device, if the preliminary error ratio BER(ne) is smaller than an early pass limit EPL(ne). The early pass limit is constructed by using an empirically or analytically derived distribution for a specific number of devices each having the specified allowable error ratio by separating a specific portion DD of the best devices from the distribution for a specific number of erroneous samples ne and proceeding further with the remaining part of the distribution for an incremented number of erroneous samples.

Abstract: The invention relates to a module for a measuring device and to a measuring device. The inventive module for a measuring device is provided with a plug-in contact element for the electrical contact of the plug-and-socket plate of the measuring device which is used for data transfer. Said module for the measuring device comprises a main circuit card arranged in the first circuit card space. Said first circuit card space is formed by at least one first element of the body which encompasses the circuit card in a closed manner on the level of the external periphery thereof.

Abstract: A method for measuring the noise factor (FDUT) of a device under test, which requires exclusively a network analyzer. The noise factor (FDUT) is calculated from the internal noise (NNWA) of the network analyzer determined in a calibration process, the power amplification (GDUT) of the device under test determined by measuring the S-parameters of the device under test, and the measured value (PNOISE) of the noise output (NNWA) applied at a first gate of the device under test without exciting the device under test with a noise signal.

Abstract: An oscillator including a resonator with at least one first tuneable element, with which a resonant frequency of the resonator can be varied. The oscillator further includes an amplifier, which provides an amplification element, connected to the resonator at a coupling position. The amplifier provides a second tuneable element, by which a complex resistance, which the amplifier provides at the coupling position, is variable in a frequency-dependent manner.

Abstract: An approach is provided for digital triggering a recording of one or more digitized signals on a digital oscilloscope by means of carrying out a level comparison for determining a triggering instant in each case between two successive sample values of a reference signal and a threshold values. According to the approach, at least one additional sample value of the reference signal is determined between two sequential samples of the reference signals by means of interpolation.

Abstract: An approach is provided for operating a radio network, wherein the operating frequency is varied systematically according to an enciphered sudden-frequency-change scheme and retained only during a hop. Several hops are combined to form a service interval, a service window being arranged at a variable position within the service interval. Given hops for different functionalities (late traffic entry, break-in, hailing, late network entry) of the radio network are specified in the service window.

Abstract: The invention relates to a network analyzer comprising a signal generator for generating an excitation signal which can be supplied to a measuring object connectable to a network analyzer by means of a measuring line, and a measuring bridge which is connected to the measuring line by means of signal transmission. A reference signal corresponding to the excitation signal can be extracted from a reference channel, and a measuring signal corresponding to a signal corresponding to a signal reflected from the measuring object can be extracted from a measuring channel. the measuring bridge comprises a resistive bridge and at least one hybrid coupler which is connected to the resistive bridge in series. the measuring bridge is operated as a resistive bridge in a low frequency range and as a hybrid coupler in a upper frequency range.

Abstract: A receiver antenna system of broad bandwidth including a plurality of active, vertical individual antennae, which have an electrically-active antenna height adapted to the respective received frequency range, is minimized with regard to the mutual electromagnetic coupling between the individual antennae, which are positioned at a small spacing distance.

Abstract: A phase/frequency comparator is described which includes two edge-triggered storage elements, each set by an edge of a reference frequency signal of a phase—or frequency-locked loop (PLL) and by an edge of an output frequency signal of the PLL. The storage elements are each reset by an output signal of a resetting logic unit, which is activated when both output signals of the storage elements are activated and then deactivated when the output signals are deactivated.

Abstract: A method is described for measuring the modulation error in digital modulated high frequency signal, whose amplitude and/or phase is digitally distorted according to a predetermined function, in particular limited by a given clip factor, in which the signal to be measured is compared with a locally generated reference signal that was generated by taking the predetermined distortion function into account.

Abstract: In a method for the excitation of port groups of a multi-port device under test with coherent incident waves of the same frequency, which provide defined amplitude ratios and phase differences within each port group, the waves are generated respectively by one signal generator of a vectorial network analyzer per test port. The network analyzer has unbalanced test ports. A system-error correction of the unbalanced incident and reflected waves with reference to the ports of the device under test is implemented in order to obtain corrected waves. The amplitude and phase changes required in the signal generators to fulfil the desired amplitude and phase conditions are calculated from these corrected waves.

Abstract: An electronic switching component (1) with gallium arsenide-based field effect transistors has its own housing (2) with at least one transparent section (3). An electronic microwave circuit (10) has at least one electronic switching component (1) with gallium arsenide-based field effect transistors and its own housing (2) with at least one transparent section (3). The at least one electronic switching component (1) can be illuminated by means of at least one light source (6, 11).