What is DMR Tier 2 On Caltta?

What is DMR Tier 2 on Caltta Two-Way Radio? DMR Tier 2 standard Two-Way Radios are designed as a cost-effective digital replacement for conventional analogue two-way radio systems. It was also developed as an affordable digital alternative to PMR, TETRA or P25. DMR Tier 2 uses a 2 slot TDMA with 4FSK modulation compared to [...]