Also known as: dPMR

dPMR (digital private mobile radio) is an ETSI narrowband standard using 6.25 kHz FDMA channels with 4FSK modulation. It is technically close to NXDN and serves the same low-cost, spectrum-efficient niche.¹

dPMR uses 6.25 kHz FDMA channels, like its close relative NXDN.

Overview

dPMR comes in licence-free (Mode 1) and licensed conventional/trunked variants. Its 6.25 kHz channelisation packs more users into a band than 12.5 kHz systems.

Technical characteristics

Property	Value
Access	FDMA
Channel	6.25 kHz
Modulation	4FSK, 2400 baud
Vocoder	AMBE+2

History

Standardised by ETSI in parallel with the narrowbanding push of the late 2000s as an open alternative for low-tier business radio.¹

Deployment

Used in European and international business radio; less common in North America than DMR or NXDN.

Decoding it with GopherTrunk

dPMR decodes similarly to NXDN given its shared narrowband 4FSK design. See Status.

Sources

1. dPMR — Wikipedia, for the ETSI 6.25 kHz FDMA 4FSK standard and its relationship to NXDN. ↩ ↩²

See also

• NXDN
• Frequency-shift keying (FSK)
• AMBE+2
• ETSI
• FDMA

Learn it step by step

• The digital protocol landscape

From the blog

• SDR Internals, Part 10: Protocol decoders & state machines