From analog PMR to digital DMR
Analog PMR radio networks have been the backbone of professional communications in transport, utilities, and security for decades. Today they show their limits in capacity, audio quality, and security. The DMR (Digital Mobile Radio) standard offers the most natural upgrade path: it uses the same 12.5 kHz channel spacing as analog networks and allows a phased migration without replacing everything at once.
Why switch to DMR
- Better audio quality — 4FSK digital modulation delivers clear, consistent voice even where an analog signal would degrade, with less background noise and fewer drop-outs.
- Double capacity on the same frequencies — TDMA (Time Division Multiple Access) technology splits each 12.5 kHz channel into two independent time slots: where one conversation passed before, two can now run simultaneously.
- Secure communications — unlike analog systems, which are easily intercepted with a commercial receiver, DMR supports AES encryption and authentication mechanisms that restrict access to authorized users only.
- Scalability — from a small private network to a multi-site Tier III trunking system, DMR grows with the organization, extending coverage as needed.
- Longer battery life — with TDMA the radio transmits only during its own time slot, halving actual transmit time and extending battery life during long shifts.
Migration challenges
Equipment costs, compatibility with existing infrastructure, and staff training are the three factors that weigh most heavily when moving to digital.
Teleproject's approach is a tailored, phased migration: Teleproject engineers integrate DMR radios with existing analog systems, keeping daily operations running throughout the transition. Teleproject also provides the training needed so all users are ready to operate the new system from day one.
A phased path
Unlike technologies that require a complete overhaul, DMR repeaters can operate in mixed mode, handling analog and digital channels simultaneously. Organizations move to digital at their own pace and within their own budget — infrastructure first, then radios group by group, until the transition is complete.
Teleproject specializes in migrating PMR networks to the ETSI DMR standard: design, installation, and technical support, with solutions tailored to the customer's requirements.
Frequently asked questions
Do I have to replace all radios at once?
No. DMR repeaters operate in mixed analog/digital mode: you can replace radios gradually, group by group, keeping the network running throughout the transition.
Do the assigned frequencies stay the same?
Generally yes: DMR uses the same 12.5 kHz channel spacing as analog systems. You do need to update the frequency-use authorization with the relevant spectrum authority (MIMIT in Italy) for the technology change — Teleproject handles this on the customer's behalf.
Does audio quality actually improve?
Yes, especially at the edge of coverage: where an analog signal becomes noisy and hissy, DMR keeps the voice clear thanks to built-in error correction. The digital vocoder also suppresses most ambient noise.
How long does a typical migration take?
It depends on the size of the network: from a few weeks for a single-repeater system to several months for multi-site networks. Mixed mode eliminates downtime: daily operations are never interrupted.