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Digital mobile radio (DMR) is a digital radio standard for voice and data transmission in non-public radio networks. It was created by the European Telecommunications Standards Institute (ETSI), [ 1 ] and is designed to be low-cost and easy to use.
dPMR or digital private mobile radio, is a common air interface for digital mobile communications. dPMR is an open, non-proprietary standard that was developed by the European Telecommunications Standards Institute (ETSI) and published under the reference ETSI TS 102 658.
Digital Mobile Radio (DMR), D-STAR, Fusion, P25 and NXDN all have a codec in the user radio and along with the encoded audio, also send and receive user number and destination information so one can talk to another specific user or a Talk Group. Two such worldwide networks are DMR-MARC and Brandmeister.
DMR is an initialism that may refer to: Biology ... Digital mobile radio, open digital radio standard for professional mobile radio and amateur radio users;
The AMBE family of vocoders has been subjected to comparative testing and found to be adequate for its intended uses, primarily mobile and aeronautical radio. The AMBE+2 vocoder has also been selected for use in the Motorola MOTOTRBO radio family as well as DMR systems, and Project 25 (P25) mobile radio system. The following reports and papers ...
"Ahoy" messages — Sent by the base station to demand a response from a particular radio unit. This may be sent to request the radio unit to send his unique identifier to ensure it should be taking traffic through the base station. Acknowledgments — These are sent by both the base stations and the mobile radio units to acknowledge the data sent.
software-defined radio receiver SDR++: GPL: Windows, macOS, Linux, Android: software-defined radio receiver WSJT: GPL: Windows, Unix, Unix-like: weak signal communication, modem for FT-8, FT-4, JT-65, and WSPR WSJT-Z: GNU GPLv3: Windows: Weak signal communication, Fork of WSJT. Splash Screen says, "Your favorite hostile fork of WSJT" WSPR: GPL
The radio then presumes any ID it receives is an odd-numbered talkgroup ID. This is the reason behind odd numbering of talkgroups on SmartNet systems. If the systems administrator assigned odd AND even numbered talkgroups there would be a lot of confusion with the Priority Monitor feature when reading the data over the voice channel.