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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.

​A walkie-talkie is a portable communication tool suitable for many different applications such as outdoor adventures, construction sites, police and firefighters, and more.

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

In the field of wireless communications, the role of repeaters is crucial to ensure seamless and reliable connections. A repeater is a device that amplifies and forwards signals, expands wireless communication range, and improves wireless communication quality.

Digital Mobile Radio or DMR is a modern technology that brings a lot of benefits both on a personal and organizational level.

In fast-moving industries such as logistics, security, transportation, construction, and retail, delayed communication can create costly inefficiencies. A POC radio (Push-to-Talk Over Cellular radio) solves this problem by enabling nationwide and even global instant voice communication without distance limitations. This article explains how POC radios work, why businesses are replacing traditional radios with them, and how choosing the right supplier like Lisheng can significantly improve operational efficiency.