Hams use repeaters to extend their coverage. ![]() In amateur radio, there’s a concept of repeaters: they are often stationed on top of a high vantage point, and relay the messages radio amateurs send to them. ![]() ![]() The main issue holding back innovation is compatibility with existing radios: if you had a hand-held that only talks Codec 2, it would not be able to communicate with all other radios still using AMBE as vocoder. Other codecs should be used, such as the open-source Codec 2. This is less than ideal in my opinion: I think it goes against the radio amateur spirit to use a closed, proprietary codec. This happens, but the vocoder (voice encoder/decoder) is not open: it uses AMBE as its codec, which is proprietary and patented. Another advantage is that it has two timeslots, so two users can use the same frequency without interfering with each other.ĭMR is also an open standard, so in theory multiple manufacturers should be able to build DMR radios. ![]() With digital radio, the quality more or less stays the same up until the cut-off point. Its main advantage over regular, analog radio is that the quality degrades better than analog radio: when moving further away from an analog radio, the quality decreases. DMR (short for Digital Mobile Radio) is a digital mode that is used on the amateur radio bands.
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