A Practical, What-You-Need-to-Know Guide to Getting on DMR. DMR (Digital Mobile Radio) is a powerful system for linking the worlds of amateur radio and the Internet. You can link your handheld radio to repeaters, individuals, or talk groups located anywhere in the world, quickly and easily. And because it's all digital, you get crystal-clear sound. The book covers the setup and use of one of the most inexpensive and popular DMR radios,...