Other
The concept of “radio travelers” is not familiar to many. These people have all the qualities of travelers: the desire to visit interesting, sometimes hard-to-reach places with an unusual landscape, nature, mountains, sea. Secondly, and this is the main thing: having reached the goal, they continue traveling, but already on the radio amateur air! To do this, participants install antennas, connect amateur radio HF and VHF equipment to them and conduct two-way radio communications. There are quite a lot of people willing to conduct communications with such radio stations.
- Categories:
4 Views
In order to reduce the dimensionality (reduce the number of features of the object of study), the article uses the methodology of “compendium–table–infographics”. Three projects related to the study of radio wave propagation in the Crimea and the Black Sea Fleet (1914, 1928 and 1954–1955), as well as studies of the physical parameters of fields and environments (hydroacoustic and magnetic fields, radar, thermal and laser characteristics of surface ships, seismic and seismoacoustic waves) are considered.
- Categories:
3 Views
Sodium tube triode detectors designed by the American radio engineer Harold Donle are considered. An analysis of the operating principle of the sodium detector has been made. Donle's patent for the design of a sodium detector is presented. The first design of a sodium detector lamp, in which a container of liquid metal sodium was used as the anode, is presented in detail. The reasons for refusing further use of this detector lamp design are indicated. Attention is paid to the second improved version of the Sodion S-13 lamp detector using a small drop of sodium the size of a match head.
- Categories:
5 Views
The paper proposes an analytical model for calculating the normalized equivalent isotropic radiated power, which allows analyzing the applicability of the asymptotic approximation proposed in the 3GPP TR 38.884 report as an acceptable method for reducing the measuring distance when determining the equivalent isotropic radiated power of 5G and higher communication system equipment in the FR2 frequency range.
- Categories:
7 Views
The paper substantiates the method of orthogonalization of linearly independent functions based on the calculation of the orthogonality weight. The form of orthogonal functions does not differ from the form of the original functions. Synthesis of optimal receivers is carried out based on the criterion of minimum noise variance at the receiver output for a fixed reference value of the useful signal. In the case of non-white noise, op-timal receivers have a finite gain in the entire operating frequency band.
- Categories:
3 Views
We propose a radar method for determining the roll angle of an aircraft using a passive beacon in the form of a radar polarization-anisotropic trihedral trihedral corner reflector (СR) with a triangular shape of reflecting edges and with horizontal intrinsic polarization. To determine the roll angle, the onboard radar uses probing pulsed radio signals with a linear plane of polarization coinciding with the transverse axis of the aircraft. Reception of reflected pulse radio signals from the passive beacon is carried out on board the aircraft in a circular polarization basis.
- Categories:
5 Views
The article analyzes the methods for measuring the radio frequency parameters of 5G subscriber equipment in the millimeter wave range for the scenario of autonomous deployment (SA) of the 5G RAN radio access network and shows the features of these measurements associated with the need to carry out them using Over-the-Air methods. The issues of analyzing the parameters being tested, analyzing the methods of Over-the-Air measurements for testing 5G subscriber equipment and improving contactless testing methods are considered.
- Categories:
3 Views
Success in creating the BINP SB RAS S-band klystron with an output power of 60 MW set the team a new task of creating a C-band klystron, since the global practice of developing modern charged particle accelerators tends to move towards higher frequen-cies. The designed C-band klystron has a twice higher operating frequency of 5712 MHz.
- Categories:
4 Views
The article presents the results of a comprehensive theoretical and experimental study of ferromagnetic resonance and microwave magnetoelectric effect in multilayer ferrite-piezoelectric structures containing single-crystal iron-yttrium garnet of cut (111) in combination with piezoelectric materials. Mathematical modeling of physical processes occurring in ferrite was performed, which made it possible to reveal weak magnetic cubic anisotropy, which must be taken into account when developing electrically tunable microwave devices.
- Categories:
4 Views