What is DMR

DMR, or Digital Mobile Radio, is a digital voice radio standard. Unlike analogue FM, DMR transmits voice digitally and allows operators to use talkgroups, time slots and network connections between repeaters.

Basic terms

  • DMR ID — a unique digital identifier for an amateur radio operator in the DMR network.
  • Color Code — the digital access code for a repeater. Our DMR repeaters use CC1.
  • Time Slot — a time slot. A DMR repeater has two slots: TS1 and TS2.
  • Talkgroup — a voice group, for example local, regional or emergency.

How a DMR repeater works

A radio transmits a digital signal to the repeater. The repeater receives it and forwards it: locally over the air, through BrandMeister, ADN Systems or another DMR master. Because DMR uses two time slots, two independent digital conversations can share one RF channel.

How to get started

  • Obtain an amateur radio callsign.
  • Register your DMR ID.
  • Program your radio: frequency, offset, CC1, TS and TG.
  • Select the nearest repeater: ES4RVN, ES4RUN or another available network repeater.
  • Ready-made codeplugs can make radio setup easier.
Get a DMR ID Codeplugs

DMR in the Narva Raadioklubi network

ES4RVN and ES4RUN are DMR repeaters operating in Narva. They are used for regular amateur radio communication, local talkgroups, digital radio experiments and crisis communication readiness.

View repeaters

Active Estonian talkgroups

DMR networks use talkgroups for communication at different levels, from nationwide contacts to local regional communication.

  • TG248 — nationwide Estonian talkgroup.
  • TG24814 — Narva and Ida-Virumaa.
  • TG24804 — Narva and Ida-Virumaa.

Emergency talkgroups

The network uses emergency and local talkgroups, including TG248112. They are intended for backup communication, operator coordination and crisis radio training.

APRS and Meshtastic

APRS maps, Meshtastic MQTT, connection instructions and active nodes are available in the separate APRS Narva project.

Open APRS Narva