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‌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.

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.

Firstly, analog radio is known for its simplicity. Unlike digital radio, which requires an internet connection or a special receiver, all that is needed to listen to analog radio is a standard FM or AM radio receiver. This accessibility has made it a popular choice for rural communities or those without access to internet services.

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