What is DMR radio?

DMR Ham Radio

DMR ham radio is an open standard radio network optimized through efficient bandwidth use via Time-Division Multiple Access. TDMA divides communication into time slots, which ensures the senders and receivers can communicate uninterrupted in two separate conversations without changing the frequency.

DMR is an open standard, which means any company can manufacture a compatible product. This makes the DMR radio market more competitive, which leads to better hardware and lower prices for consumers. This makes the DMR ham radio community easy to join. Follow along to learn the basics and get started in the DMR ham radio world.

Digital Mobile Radio (DMR) is an international digital radio standard developed by the European Telecommunications Standards Institute (ETSI), and first ratified in 2005. More than a decade ago, vendors and users of radio systems recognized that the existing analog trunking standards required updates with modern techniques to provide:

1. Improved voice quality
2. Improved functionality such as Location information)
3. Improved security (i.e. Authentication and Encryption)
4. Improved channel efficiency (2-slot TDMA)

As a result, today, we have a complete set of standards that cover voice, data services, and conformance testing.
DMR aims to provide an affordable, low-complexity digital standard to replace analog radio. The ETSI DMR Standard defines three different tiers on www.dmrassociation.org:

• Tier I (unlicensed): DMR equipment works in Direct Mode (unit-to-unit) on public frequencies. Tier 1 DMR devices are best for individuals, recreation, small retail, or other situations that do not require wide area coverage.
• Tier II (licensed conventional): This Tier is aimed to be a direct replacement for the analog conventional radio system. These DMR systems operate under individual licenses working in Direct Mode (unit-to-unit) or using a Base Station (BS) for repeating. It has a degree of wide-area coverage and is targeted at users “who need spectral efficiency, advanced voice features, and integrated IP data services in licensed bands for high-power communications.”
• Tier III (licensed trunked): DMR trunking systems operate under individual licenses with a controller function that automatically regulates communications. It also supports packet data services in a variety of formats, including support for IPv4 and IPv6. It is ideal for organizations looking to migrate from MPT-1327/EADS/LTR (logic trunked radio) systems or who want the full benefits of managed trunking, voice, and data solutions.

The DMR standard also specifies the use of TDMA technology. TDMA stands for Time Division Multiple Access. TDMA provides two logical channels and each 12.5-kilohertz channel space (see diagram below). This provides a useful doubling of capacity within the same analog channel space.

What DMR Radio should I buy?

You have two choices here, either a DMR Portable or a DMR Mobile. The DMR Portable is a low-power device and resembles a walkie-talkie. The DMR Mobile is a high-power device, but since DMR operates so efficiently, these models are generally reserved for use in commercial radio and look much like the radios police cars have in them.

If you want to buy the one DMR radio, you can order the following best dmr radios

Brand: Retevis-Ailunce, Ailunce is Retevis' Sub-brand, only for amateur radios

Model: HD1

Operating range: 136-174 /400-480MHz  /76-107.95MHz

Number of channels: 3000

Squelch/Coding: Yes, CTCSS/DCS subtones, DMR mode with the basic and enhanced encryption

Output Power: VHF 10W/5W/1W  / UHF 8W/4W/1W

Possibility to connect a PTT/Headset: Yes

Battery: Li-ion / 3200mAh

Supports both digital and analog modes, compatible with existing analog systems, users can gradually switch analog terminal settings according to budget and actual communication needs.

Dual time slot for point-to-point supports two group calls in one channel under a direct model; 3000 channels, and 20000 priority contacts enable you to call the people important to you more conveniently. You may upload 200,000 contacts.

Waterproof walkie-talkie HD1 has VFO mode; very easy to operate.3200mAh battery enables normal use 7 days standby / 2-3 days typical use / Continues use 12-16 hours.

HD1 has a GPS positioning function, the GPS function gives you location information like latitude and longitude, and altitude.

SMS function support texting the information to another radio with the same DNA protocol. In the event of an emergency, GPS can be used to locate the team's location for emergency rescue.

IP67 waterproof rating, can be immersed in 1 meter of water for 30 minutes, waterproof and dustproof function, can be used in rainy and snowy weather, and very suitable for outdoor use. 

AILUNCE HD1 DMR Digital VHF/UHF Handheld Radio With CTCSS/DCS TONE SQUELCH long-range waterproof ham radios

2. Retevis HD2 – Bluetooth-Enabled Dual Band DMR Radio

HD2 is a powerful and versatile DMR radio that supports both digital and analog communication. Ideal for outdoor and mobile ham radio users, it offers robust performance with modern connectivity.

Key Features:

• Dual Band DMR: Supports digital and analog modes with clear, encrypted audio

• Bluetooth 5.0 Headset Support: Enables hands-free VOX operation, perfect for mobile use

• Built-in GPS: Real-time latitude/longitude tracking for outdoor and emergency scenarios

• Massive Contact Capacity: Upload up to 500,000 DMR contacts; manage 5,000 priority contacts

• IP67 Waterproof: Reliable even in harsh environments – rain, snow, or dust

• Other Functions: VOX, lone worker, remote monitor, talk around, firmware updates, color code setting, and more

2. Retevis P1 – Professional DMR Radio with Enhanced Encryption

P1 is a high-power professional-grade DMR radio designed for users who need advanced encryption and extended range for critical communications.

Key Features:

• ARC4 / AES128 / AES256 Encryption: Compatible with Motorola systems for secure communication

• High Power Output: Ensures long-range, stable transmission

• 260 Hours Recording Playback: Convenient for mission logs or field documentation

• Full Feature Set: Vox, Lone Worker, Emergency Alarm, Remote Monitor, Channel/Priority Scan

• Versatile Operations: SFR Mode, Battery Saver, Talk Around, Firmware Upgrade

3. Retevis NR30D – Compact AES256 DMR Radio for Secure Communication

The NR30D is a powerful compact DMR radio, ideal for users who prioritize lightweight design with high-level security and functionality.

Key Features:

• Adjustable Output Power: High/Mid/Low settings for flexible use

• Dual Zones: Easy channel management for workgroups

• AES256 Encryption: For secure and private communication

• Hands-Free VOX Operation, Channel Lock, Scan, Roger Beep

• Emergency Features: Lone Worker, Emergency Alarm, Remote Stun/Kill

• Battery Saving & Time Out Timer

• DCDM Support: Dual Capacity Direct Mode for improved efficiency

Whether you're just getting started in the DMR world or you're looking to upgrade your equipment, HD1, HD2, P1, and NR30D offer the power, encryption, and reliability to meet any amateur radio operator's needs.