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When the PTT button is pressed, the indicator light lights up red, indicating that the walkie-talkie is in the transmitting state and you can speak at this time.

With the help of repeaters, maintaining a reliable and stable communication network has become easier than ever before. So, let's take a closer look at the use and characteristics of repeaters.

In the amateur section, there are very strict norms, and they will be specially trained when testing. At 409m exemption, there are the following provisions: 1.Do not change the transmitting frequency and increase the transmitting power (including additional radio frequency power amplifier) without authorization. 2.Do not cause harmful interference to various legitimate radio business when using. Once harmful interference is found, use it immediately, and take measures to eliminate interference before continuing to use it; *Using public intercom, its communication quality is not protected by radio management agencies, and the radio business that may work normally should be caused by other normal jobs; 3.It is forbidden to use on the airport and aircraft; 4.It is forbidden to interconnect with the public telephone network, public mobile communication network and other telecommunications networks.

‌DMR radio is a communication device based on the Digital Mobile Radio (DMR) standard. The DMR standard was developed by the European Telecommunications Standards Institute (ETSI) to meet the needs of low-end professional and commercial users in European countries and provide efficient and reliable communication solutions.

Intercoms play a vital role in all fields of modern society, and their wide range of usage scenarios provide efficient and stable communication guarantees for work and activities in different industries.

Many users don't know how to "pair" channels when using walkie-talkies. Next, let's learn about the related knowledge.