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Peculiarities of joint operation of radio stations with different frequency diversity of the channel frequency grid

Peculiarities of joint operation of radio stations with different frequency diversity of the channel frequency grid

Abstract

The existing networks of railway technological radio communication of the meter range of radio waves are built on the basis of radio equipment with a diversity of adjacent channels of 25 kHz. In the transition period, it is necessary to ensure the joint operation of various radio equipment when introducing radio equipment with a frequency channel grid step of 12.5 kHz. The paper proposes a unified numbering of channel assignments of radio networks based on the principle of superimposed frequency grid. This allows you to use all current regulatory documents on the distribution of channels between different services, the selection of intermodulation compatible frequencies for networks of various purposes based on the channel compatibility table. At the same time, the frequencies of all odd channel numbers in different numbering systems will match. In radio communication channels, when transmitting signals with a maximum deviation of 5 kHz and in receivers with a frequency difference of 12.5 kHz, there is a discrepancy between the radiation parameters and the bandwidth of the receiver. When the nominal frequencies of transmission and reception differ, nonlinear distortions increase, which leads to a decrease in speech intelligibility. When transmitting signals in the reverse direction, the reception volume deteriorates in receivers with a channel separation of 25 kHz. Studies have shown that when radio stations with different frequency deviations work together, satisfactory conditions can be ensured by adjusting the amplitude-frequency characteristics of the transmission and reception paths. When using radio stations with a channel spacing of 12.5 kHz, the conditions for ensuring electromagnetic compatibility deteriorate somewhat. But with the appropriate choice of operating frequencies, the preservation of the conditions of electromagnetic compatibility and radio communication range is ensured, with partial use of the existing infrastructure. 

Ураховуючи систему організації радіозв’язку, що склалася на залізницях, і актуальність питань впровадження більш сучасних технічних засобів, у статті розглянуто основні аспекти спільної експлуатації радіозасобів з різним канальним рознесенням. У перехідний період будуть одночасно функціонувати радіозасоби з різними смугами випромінювання і приймання. Розроблено рекомендації з упорядкування нумерації, присвоєння та вибору частот. Розглянуто особливості роботи радіостанцій з різним частотним рознесенням і усуненням недопустимих взаємних завад.

Keywords

частотне рознесення каналів, умови спільної роботи, frequency diversity of channels, залізничний технологічний радіозв’язок, електричні характеристик радіозасобів, railway technological radio communication, conditions of joint work, electrical characteristics of radio equipment

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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