TETRA Amateur Radios Discussion Group tetra@groups.io
TETRA Amateur Radios Discussion Group
Tetra and Amateur Radio
Discuss TETRA systems and hardware here. Programming questions related to TETRA may also be posted to this group.
TETRA has been slow to catch on in North America for regulatory and commercial reasons, but is starting to come into its own.
TETRA was born in ETSI in the 1990s, when the professional mobile radio community collaborated to write a standard to meet the requirements of public safety and government users, commercial professional users, operators, spectrum regulators, manufacturers and others involved in the implementation of critical communications.
Public safety could be argued to be the last frontier and the great prize for TETRA in the US mission- critical comms market. Steve Macke, principal at Advent C3, notes that: “Harris County in Georgia is sharing Diverse Power’s TETRA infrastructure, so there are already public safety agencies using this technology in the US. I think gradually that ‘ah-ha moment’ will become clear because when a local government compares TETRA against DMR they’re going to see that not only [does TETRA] have a faster set-up time (sub-300 milliseconds), they’re also going to hear the better audio quality and see the economies of it. It’s faster, it’s cheaper and it’s better.”
What is TETRA?
- Is an ETSI standard digital radio solution that is more like a cellular telephone system than other LMR standards.
- Standards (EN 300 392) were published in 1995 – the same time as P25 phase 1 was published in the USA.
- Operates in 25kHz channels and uses 4 slot TDMA to achieve 6.25kHz equivalence (1 communication path per 6.25kHz of spectrum)
- Only includes trunked operation.
- Primary market is Europe. It is starting to appear in the USA and Oceania.
https://groups.io/g/Tetra
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Motorola MTM 5400 TETRA radio
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