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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.

Since 1993, Lisheng Communication Co., Ltd. has gone through 30 years and has experienced countless challenges and opportunities ...

The phase-locked loop and voltage-controlled oscillator (VCO) generate the transmitted RF carrier signal.

​One of the biggest advantages of DMR radios is their ability to transmit digital audio signals. Unlike analog signals, digital audio signals are less likely to be distorted by background noise or interference from other radios.

The Professional DMR Repeater boasts a range of advanced features, making it an excellent choice for reliable communication. One of the most significant features of this device is its ability to provide seamless connectivity across its coverage area.

‌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.