A method for testing the muting performance of a short wave radio station

A technology of short-wave radio stations and testing methods, which is applied in transmitter monitoring, receiver monitoring, etc., can solve the problems of quantitative testing and analysis of noise suppression, and achieve the effect of improving repair reliability

Active Publication Date: 2018-12-11
国营芜湖机械厂
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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-wav

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  • A method for testing the muting performance of a short wave 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 test method for muting performance of a short-wave radio station, which forms a two-tone modulated signal by adding an interference signal to a single-tone modulated standard signal. The ratio of modulation degree of utterance audio modulation signal to that of interference audio modulation signal is defined as the ratio of muting suppression when the product is in the critical state of muting. When the parameter is less than 3, it indicates that the squelch threshold setting is low, which is prone to cause the radio station squelch failure in complex electromagnetic environment. When the parameter is more than 3, it indicates that the squelch threshold setting is high, which is prone to cause the radio station to receive unsmoothly. A squelch threshold circuitis adjusted to make the squelch suppression ratio equal to 3 to achieve the purpose of adjusting the radio station squelch ability. The invention can quantify the squelch test result, and proposes theidea that the squelch suppression ratio parameter can 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 ...

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Application Information

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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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