A Test Method for Noise Suppression Performance of Shortwave Radio Station

A technology of short-wave radio stations and testing methods, which is applied in receiver monitoring, transmitter monitoring, etc., can solve the problems of inability to quantitatively test and analyze the degree of squelch, and achieve the effect of improving repair reliability

Active Publication Date: 2021-04-16
国营芜湖机械厂
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a test method for the squelch performance of short-wave radio stations, which solves the disadvantage that the existing test method cannot quantitatively test and analyze the squelch degree

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  • A Test Method for Noise Suppression Performance of Shortwave Radio Station

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Embodiment Construction

[0025] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below.

[0026] In the traditional squelch test, only standard signals are used to input the shortwave radio station to test the squelch performance of the radio station. This method can only qualitatively judge the squelch performance, and cannot provide quantitative parameters for repair and adjustment of squelch suppression.

[0027] In order to quantify the squelch ability of the short-wave radio station, the method proposed by the invention adds an interference signal to the single-tone modulated standard signal to form a dual-tone modulated signal. The squelch suppression ratio is defined as the ratio of the modulation degree of the speech audio modulation signal to the modulation degree of the interference audio modulation signal when the product is in a critical state of maintaining squel...

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Abstract

The invention relates to a method for testing the squelch performance of a short-wave radio station. An interference signal is added to a single-tone modulated standard signal to form a dual-tone modulated signal. The squelch suppression ratio is defined as the ratio of the modulation degree of the speech audio modulation signal to the modulation degree of the interference audio modulation signal when the product is in a critical state of maintaining squelch. When this parameter is less than 3, it indicates that the squelch threshold is set too low, which may easily cause radio squelch failure in complex electromagnetic environments. When this parameter is greater than 3, it indicates that the squelch threshold is set too high, which may cause poor radio reception. The circuit makes the squelch suppression ratio equal to 3 to achieve the purpose of adjusting the squelch ability of the radio station. The invention can quantify the squelch test results, and proposes the squelch suppression ratio parameter to effectively repair the radio station.

Description

technical field [0001] The invention relates to the field of testing short-wave radio stations, in particular to a method for testing the squelch performance of short-wave radio stations. Background technique [0002] Shortwave radio stations generally use a frequency discriminator for demodulation. The frequency discriminator separates the effective signal from the background noise signal according to the signal input frequency. The frequency discriminator follows the parabolic distribution of the power spectrum of the output noise, and the square increases with the increase of the output frequency. Therefore, , when there is no useful input signal, it will output relatively large noise, and it is necessary to use a squelch circuit to process the noise. When there is no audio signal input or the signal is very weak, the output is cut off to keep the earphone quiet. For aircraft, the pilot communicates with the tower through the short-wave radio station. If there is no good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/15H04B17/29
CPCH04B17/15H04B17/29
Inventor 沐昌兴徐江朱维玮徐林林李滨
Owner 国营芜湖机械厂
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