Also known as: DMR Tier I, DMR Tier 1
DMR Tier I is the licence-free tier of the DMR standard, defined by ETSI for low-power, short-range consumer and light commercial use without an individual user licence.1
Overview
Tier I targets the same role as licence-free analog radios, but digital. It uses fixed low power and a small set of designated channels, so no system planning or trunking is involved. Equipment is simple and inexpensive.
Technical characteristics
| Property | Value |
|---|---|
| Licensing | Licence-free, limited power |
| Access | Conventional (TDMA-capable hardware) |
| Channel | 12.5 kHz |
| Modulation | 4FSK |
| Vocoder | AMBE+2 |
History
Tier I was specified alongside the other tiers in ETSI’s DMR documents to cover the unlicensed consumer segment.1
Deployment
Found in inexpensive consumer handhelds in regions that allocate licence-free DMR channels; less common than Tier II in North America.
Decoding it with GopherTrunk
Tier I traffic is conventional DMR and decodes like any Tier II conventional channel once tuned. See Status.
Sources
-
Digital mobile radio — Wikipedia, for the ETSI DMR tier structure, including the licence-free Tier I. ↩ ↩2