dPMR446

dPMR446 is a digital mobile radio standard operating in the UHF 446 MHz band. It is a license-free technology, meaning users do not need to obtain a license to operate dPMR446 devices. This makes it accessible for a wide range of applications, including recreational use, small businesses, and event management.

The standard is based on the ETSI TS 102 959 specification. dPMR446 offers improved audio quality and greater spectral efficiency compared to its analog counterpart, PMR446. It utilizes Time Division Multiple Access (TDMA) technology, allowing two users to share the same frequency channel simultaneously, effectively doubling the capacity. This digital approach also enables features such as private calls, group calls, and text messaging.

Devices operating on dPMR446 typically have a power output of 0.5 watts ERP (Effective Radiated Power), similar to PMR446. The system operates on a grid of 8 channels, spaced 12.5 kHz apart. The use of digital modulation schemes like Pi/4 DQPSK contributes to its robust performance and resistance to interference. dPMR446 is designed to be interoperable, allowing devices from different manufacturers to communicate as long as they adhere to the standard. Its license-free nature and enhanced communication capabilities make it a popular choice for short-range, personal, and professional two-way radio communication.

---