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How to use the noise suppression function of Motorola radio correctly?

作者: 来源: 浏览次数:592 Published: 2019-01-29 Author: Source: Views: 592

的静噪功能? How to use the noise suppression function of Motorola radio correctly?

There is a big difference between Motorola walkie-talkies and wired telephones when it comes to answering, that is background noise. Under normal circumstances, wired telephones are basically free of background noise (regardless of the distance of the communication distance), and in the wireless communication of Motorola walkie-talkie, background noise will inevitably occur, the background noise and the strength of the received signal, the distance of the communication distance, and The quality of the radio has a lot to do with it.

Motorola walkie-talkies are in use, the walkie-talkies are in a waiting state for a long time. When there is no signal input from the receiver, the internal noise can produce a large noise at the audio output end, and the speaker will make a large "rustle" sound. This is mainly Because the receiving part of the walkie-talkie has high sensitivity and large gain, this kind of noise is annoying, causing interference and hearing fatigue to the user.

  


When there is a signal input, the signal has a significant suppression effect on the noise, the noise level is reduced, and it does not affect the communication effect. Therefore, the two-way radios used as mobile communications are equipped with a squelch circuit. Its function is to wait for calls and talk. During the interval, the low-frequency amplifier of the receiver is automatically locked to prevent noise from being output from the speakers or headphones.

When a signal is input, it can automatically and quickly release the locked state, so that the signal is output through the low-frequency amplifier. Therefore, the receiving part of the wireless walkie-talkie is in a noise-free working state, which not only overcomes the unpleasant "rustle" noise, but also significantly reduces the power consumption of the walkie-talkie, and can extend the effective use time of the walkie-talkie battery.

We all have this experience when using Motorola walkie-talkies. When the received signal is strong, the noise is small or even no noise; when the signal is weak, the noise is large. When using the same two-way radio to receive the other party ’s signal, the closer the communication distance is, the stronger the received signal is and the smaller the noise is; on the contrary, the longer the communication distance is, the weaker the received signal is, the louder the noise is, and the other party is not even heard Speech sound. This requires us to properly adjust and use the squelch function of the radio according to different situations to solve the relationship between useful signals and squelch.

The squelch switch is a function key specially designed to resolve the contradiction between call quality and noise of wireless walkie-talkies. In the walkie-talkie before the mid-1990s, the squelch switch is designed on the control panel. It is an adjustable squelch control button (key) (SQL), which changes the size of the variable resistor to achieve the squelch. Stepless adjustment from largest to smallest. Since the mid-1990s, in the design of walkie-talkies, the maximum noise and the minimum noise have been divided into several files. Each file is called a level, which is expressed by numbers, called the noise suppression level, and also the noise suppression level. The squelch level (level) assigned by each model is different.

Here, the larger the number, the higher the level, and the higher the level, which indicates that the squelch suppression ability is stronger, and the interference from noise or other unrelated signals is less, and the noise is smaller, but it is also less likely to be received. Need to receive useful weak signals. Conversely, the smaller the number, the lower the level, the lower the level, the weaker the ability to suppress noise suppression, the greater the interference from noise and other unwanted signals, and the easier it is to receive weak useful signals. A "0" level indicates that there is no squelch suppression function, which is the lowest level.


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