not TDMA), but they do not have to use continuous transmission mode. Tier 1 radios may use continuous transmission mode, which means that the radio does not pulse on and off like with tier 2 and 3 (i.e. Uses 12.5KHz bandwidth channels just like tier 2 and tier 3. Many Chinese radios incorrectly use the term. It does not! A Tier 1 DMR radio is specifically made for PMR446. May only be used in countries where PMR446 is legal.ĭo not confuse Tier 1 to mean any radio which only does simplex. Radios are band limited to PMR446 frequencies only. Direct mode (radio to radio, also called simplex) communication (meaning no repeaters), limited to 0.5W and with a fixed antenna. Licence free for use in the PMR446 band only. Do not try to equate tier 2 DMR to tier 2 dPMR. The tiers are not related between different standards. Even though they use the same parameters (the human voice), they are different languages so will not be able to talk together. It's just like comparing Russian and English. They both use the same vocoder, but this does not mean they are compatible, because they use different bandwidths and simply because they are different standards. Both of them are digital standards, just like P25, NXDN, D-STAR, TETRA, TETRAPOL, OpenSky. In this post I will explain the terminology and hopefully stop any further confusion. DPMR and DMR are two completely separate and different standards but many people are confused by them because of the terminology used around them.
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