The design documentation was developed, the layout was made, and an experimental study of the direction-finding receiver was conducted. A functional diagram and a description of the design are given. The method of the experiment is given. Shows the achievement of the following parameters: operating frequency range: centimeter; the dynamic range of the signals at the entrance 48 dB; the duration of the received pulses is not less than 0.1 µs; the irregularity of amplitude-frequency characteristics of not more than 5 dB.

Keywords: direction finding receiver, logarithmic receiver, amplitude-frequency response, amplitude response, dynamic range

Article is devoted to the creation of direction finders for bearing earthquakes ionospheric precursors. Structural diagrams of two direction finders variants are given, their advantages and disadvantages are shown. Algorithms for the direction finders functioning and selection of ionospheric precursors are developed.

Keywords: radio direction finder, ionospheric earthquake precursor, signal selection, phased antenna array, wave, oscillation, phase, azimuth, angle of elevation

The paper describes the design of a magnetic stimulator for studying the effect of ferromagnetic nanoparticles on biological objects in a magnetic field. In a magnetic stimulator, an electromagnet acts as a source of exposure, which creates an alternating magnetic field. To register the magnitude of the magnetic field created a special device based on Arduino. The presented magnetic stimulator can be used in the study of biological objects in vitro and in vivo. The stimulant is made of inexpensive, readily available components.

Keywords: magnetic stimulator, ferromagnetic nanoparticles, alternating magnetic field, electromagnet

Hydroacoustic parametric monitoring and communication systems are considered. Brief description developed at the Department electrohydroacoustical and medical technology, Institute of nanotechnologies, electronics and instrumentation, southern Federal University (Agaimt INAP SFU) is the most promising sonar systems with parametric emitting antenna. Presented appearance and radiation pattern (days) of various embodiments of converters pumping parametricheskikh antennas of small-sized profiling. The design of composite Converter and parametric pumping days seysmoprofilografa. The description of the parametric side-view sonar and traverse-view sonar is given. In addition, parametric systems of hydroacoustic communication and monitoring of the sea on long routes are considered.

Keywords: hydroacoustic parametric system, parametric antenna, data transmission system, broadband antenna, water area monitoring, parametric profilograph. parametric navigation system, traversy overview

A simulation and experimental study of the ring-shaped power divider in the frequency range 2-4 GHz. The simulation was carried out in the application package Microwave Office. The experiment was conducted on a model made on the sheet textolite PT-3 with a thickness of 2 mm. Four frequency dependencies of the transmission coefficient S21 and S31 are given as simulation and experiment results.

Keywords: power divider, symmetrical strip line, transfer factor, design description, modeling, experiment

An experimental study of a transistor generator with varicap rearrangement has been carried out. A schematic diagram is given, a brief description of the construction and an experimental technique are given. As the results of the experiment are given: • frequency dependence on control voltage (modulation characteristic) • dependence of power on control voltage (parasitic amplitude modulation) • output spectrum in the 500 MHz band

Keywords: FM signal generator, voltage-controlled oscillator, modulation characteristic, output spectrum, transistor oscillator

A simulation and experimental study of a directional coupler with transformers on ferrite rings has been carried out. The operating frequency range is from 100 to 500 MHz. The directional coupler was modeled in the Microwave Office application package. An experimental study was carried out using a vector analyzer of the type "Overview-103". The frequency dependences of the working attenuation and transient attenuation are obtained. The directional coupler can be used in transmitting and measuring technology.

Keywords: Directional coupler, working attenuation, transient attenuation, decoupling, scheme, design

An experimental study of the intermediate frequency amplifier with a bandwidth of 25 to 155 MHz and a gain of about 40 dB was conducted. Given the functional diagram and one cascade of the concept. There is a brief description of the design. The experimental technique is described. The results of the experiment are given: two amplitude-frequency characteristics and one amplitude.

Keywords: intermediate frequency amplifier, experiment, amplitude-frequency characteristics, dynamic range, compression point

Detection and identification of features on television images is one of the important problems in technical vision systems. The effectiveness of the vision systems directly depends on the performance of the feature detection stage. An important step in image processing is the steady detection and identification of features of the image (landmarks) as the observation conditions change.

Keywords: image processing, technical vision, robust detector, detection efficiency

There are represented scheme and design of duplexer for the 300-344 MHz radio station. Simulation of duplexer was implemented in Microwave Office environment. Experimental research was executed on the complex transmission coefficient measuring instrument such as “Obzor-103”. There are shown amplitude-frecuency characteristic of receive and transmission channels. Comparison of the simulations results with natural experiment proving the identical.

Keywords: Filter, duplexer, amplitude-frequency characteristics, receive channel, transmission channel

A study of the directional coupler range 1-4GHz. The description of the construction on a symmetrical strip line with a lateral connection is given. The amplitude-frequency characteristics were simulated using the Microwave Office package. The model of the directional coupler is experimentally investigated, the following results are obtained: the working attenuation does not exceed 1.7 dB, the transient attenuation does not exceed 10 dB.

Keywords: Directional coupler, frequency response, flatness, symmetric stripline

The statistical characteristics and results of the FIPS 140-2 tests of a new class of pseudo-random signal generators based on modified Lorentz, Chua and Dmitriev-Kislov systems over the finite Galois field are considered. The estimates of the sidelobe levels of the correlation functions of the signals, as well as histograms of the probability distributions of the generated numbers, are obtained. Evaluations of compliance with the requirements of the FIPS 140-2 test of binary sequences generated on the basis of systems under variation of their parameters are obtained. The results of the work can be used in the construction of communication systems with broadband signals, simulation and cryptography.

Keywords: dynamic chaos, radioelectronic dynamic systems, statistical properties

Frequency divider based on linear logic is considered. The circuit design concept is based on current mirrors, that provide low dependence from supply voltage. The circuit design of frequency divider and results of simulation on 0.25 um CMOS technology are presented. Additionally, advantages in controlling current consumption and output voltages by changing the value of the reference resistor are shown.

Keywords: frequency divider, current logic, linear algebra

Digital signal processing is commonly used in system engineering of a new state of the art. The monotonic (maximally-flat) step response of the high pass filter is required, for example, in the case of testing for a negative signal present against the background of the positive rectangular impulse of rather higher amplitude. Or, conversely, to determine whether a positive signal is present against the background of the negative rectangular impulse. As this takes place, a signal pass is allowed, but a false detection is not allowed. The reason of the false detection can be a negative overshoot on the step response of the high-pass filter that is used for suppressing a dc component and decreasing flicker noises. This case we can see in electromyography, for example, when weak nerves signal follows the strong test electrical pulse. Approximations of analog filters via a bilinear transformation had been used to research of digital filters first order filters differing step response monotone and the results of these researches are outlined in this paper. The block diagrams of digital filters featuring a more monotonous step response, but with an overshoot on the frequency response in a passband near to the cutoff frequency are offered. The requirements have been analyzed at which a negative effect of this overshoot is being reduced.

Keywords: filter, digital, high pass, HPF, monotonic, maximally-flat, step response

Digital signal processing is commonly used in system engineering of a new state of the art. The monotonic (maximally-flat) step response of the high pass filter is required, for example, in the case of testing for a negative signal present against the background of the positive rectangular impulse of rather higher amplitude. Or, conversely, to determine whether a positive signal is present against the background of the negative rectangular impulse. As this takes place, a signal pass is allowed, but a false detection is not allowed. The reason of the false detection can be a negative overshoot on the step response of the high-pass filter that is used for suppressing a dc component and decreasing flicker noises. This case we can see in electromyography, for example, when weak nerves signal follows the strong test electrical pulse. Approximations of analog filters via a bilinear transformation had been used to research of digital filters Bessel and Gaussian filters differing in the greatest step response monotone (especially Gaussian filters) and the results of these researches are outlined in this paper. The block diagrams of digital filters featuring a more monotonous step response, but with an overshoot on the frequency response in a passband near to the cutoff frequency are offered. The requirements have been analyzed at which a negative effect of this overshoot is being reduced.

Keywords: filter, digital, high pass, HPF, monotonic, maximally-flat, step response

This article analyzes the possibility of decomposing a radio engineering system into parts, provided that one of the two stabilizing parameters of the coupling scheme is adjusted. An analytical calculation was made (in general), which proves the possibility of adjusting only one stabilizing parameter in the coupling scheme. A numerical example is provided confirming the above idea.

Keywords: HIL simulation, radio engineering system, decomposition, coupling scheme, stabilizing parameter, coupling two-port network, ideal time delay line, Schur complement, Y-parameters

Modelling and experimental research of narrow band filter on opposing rods was made. Center frequency is 1010 MHz. In the far zone the filter has blocking more than 100 dB. The pass band width on the Level minus 3 dB from the maximum is 13 MHz, and losses in the pass band are 8 dB.

Keywords: Filter on opposing rods, modelling, experiment, amplitude-frequency characteristics, pass band

Models of wireless communication systems with phase modulation formats and various channel models are considered; The influence of phase fluctuations on the level of errors in communication channels with phase modulation formats is analyzed.

Keywords: modulation, sinal/noise, jitter, the Rayleigh channel, the Rician channel, the simbol and bith errors

With the help of the previously developed application Plex, automation of planning and conducting multifactor experiments in the study of the characteristics of field-effect transistors was performed. The regression and dispersion analysis of experimental data is carried out, the quality of regression models is estimated, the influence of the number of initial experimental points on the quality of regression models is investigated. The application increases the efficiency of research related to field experiments in determining the characteristics of field-effect transistors, as it makes it possible to reduce the number of required experiments, to automate the processes of storage, extraction and processing of information.

Keywords: planning, factor, experiment, field (unipolar) transistor, application, regression, dispersion, prediction, approximation, simulation

The modern schemes of phase shifters used in radio receivers, antenna systems, synchronous detectors are limited in a wide frequency range to dependence of phase shift at the release of the scheme from the frequency of an entrance signal. In this work the new scheme of the programmable phase shifter which allows to use the phase shifter in the wide frequenciest range irrespective of the frequency of an entrance signal and also to carry out a phase displacement with a high precision is offered.

Keywords: phase shifter, synchronous detector, lag line

Application of low-power thermal resistors in starters requires availability of intermediate equipment and various components. It significantly reduces the reliability of the equipment. Increase in currents flowing through the pre-regulating devices simplifies electrical schematic of the control and regulation. To use thermal resistors in circuits with high currents it is necessary to use special designs, for the purpose of thermoresistor's material overheating prevention. Algorithms for synthesis of starting rheostats are given. The dependences characterizing different starting models are given.

Keywords: semiconductor thermal resistance, starting current models, generalized current characteristics

In this paper, we consider the application of the optical heterodyning method for signal processing of a receiving device. The simulation of the developed scheme was carried out in the environment of OptiSystem. Also presented are the results of modeling, explaining the principle of operation of this scheme.

Keywords: optical heterodyning, radio frequency, L-band, signal spectrum

Modeling and investigation of filters of selective rejection of narrow-band noise with a priori unknown frequency and selective suppression of multidimensional pseudorandom signals of discrete-nonlinear Lorentz system are carried out. The transformation of signal with phase manipulation in the digital selective nonlinear reject filter are studied. The digital functional rejection filters for selective signal rejection by form, synthesized in according to the principle of two-channel invariance theory, in information transmission systems with PSK-signals for suppressing additive harmonic signals of narrowband interference and masking pseudo-random signals of discrete nonlinear Lorentz systems is recommended. Recommendations on the use of digital non-linear rejection filters using mathematical programs are developed and justified.

Keywords: reject filter, narrowband interference, Lorenz system, pseudo-random signal

The work is devoted to the detection of instability in the frequency of generators, which provide synchronization of digital communication networks. An algorithm for detecting short-term instability of the frequency of superstable quasi-harmonic oscillations

Keywords: synchronization, instability, frequency, Alan variation, multiplicative-transformative criterion, harmonics

The article studies the power divider of 10-centimeter range. A description of the scheme and design of the power divider on the air-strip transmission line. The analysis of the amplitude-frequency characteristics of the power divider in the forward and lateral shoulders with the help of the Microwave Office package is carried out. The model of the power divider is experimentally studied, the following results are obtained: in the band from 2.4 to 3.7 GHz, losses do not exceed 4.3 dB, and the unevenness does not exceed 1.7 dB.

Keywords: power Divider, directional coupler, plume bridge, amplitude-frequency characteristic, losses, unevenness