DMR Talkgroup Lists — Downloads
Hand-sorted DMR talkgroup lists for English-speaking hams, not raw database dumps. Each list is edited and trimmed to the talkgroups that are active and in English, then formatted to import straight into your radio’s CPS. Nine networks in one place. Pick yours, download the CSV, and you’re on the air.
- Curated, not exported
- English-language talkgroups
- Dead talkgroups removed
- Sorted for real-world use
- Updated August 2026
Digital Voice Reflector Lists — Downloads
Computer script sorted XLX, M17, URF and YSF reflector lists for English-speaking hams, not raw registry dumps. Each one is edited down from the network’s own host file to the reflectors in English-speaking countries, with the evidence behind every entry stated on the row. Four networks in one place. Open a list in your browser, or download the CSV.
- XLX · 398 of 893
- M17 · 56 of 109
- URF · 101 of 207
- YSF · 731 of 1,470
- Compiled August 2026
DMR TX Audio Level — Setting Yours Right
Varying transmit audio is one of the top complaints on DMR. This guide covers what causes it, how to test your own with Parrot (9990) and Hoseline, and where to set the mic gain on the five most popular handhelds.
Reflector Lists — Downloads
Hand-sorted reflector and room lists for English-speaking hams, trimmed to what’s active and ready to load.
YSF / Fusion Reflector List
M17 / XLX Reflector List
NXDN / P25 List
Reflector References — Downloads
In-depth reference guides to the open-source digital-voice reflectors, covering how each one is built, how it links, and how hams connect to it. Each is a searchable PDF, compiled from the source code, the maintainers’ own documentation, and accounts from operators running live systems. Free to use and share.
The XLX Reflector Reference
The multi-protocol reflector at the heart of the D-STAR, DMR, and Fusion world. Covers modules, transcoding, ports, connecting by mode, and interlinking across the wider network.
The URF Reflector Reference
The universal reflector that carries every major mode: D-STAR, DMR, Fusion, P25, NXDN, and M17. Covers modules, transcoding, ports, connecting by mode, and interlinking across the wider network.
The mrefd (M17) Reflector Reference
The M17 reflector: single-mode by design, with no transcoder or vocoder hardware. Covers channels, encryption, ports, connecting and selecting a channel, and interlinking with the wider M17 network.
Slide Deck Presentations — Downloads
Slide Stack Presentations with speaker notes.
Digital Voice: The Six Modes, and How to Start
The talk to give before anyone chooses a mode. What the six modes are, where each came from, why six vocabularies hide about six ideas, what the radios cost, and how to start without spending anything.
What DMR Is, and How It Actually Works
DMR for operators who already know analog. TDMA, talkgroups and time slots, static versus dynamic, Talker Alias, the codeplug, and an honest account of the downsides.
Time Stations: The Stations That Broadcast Time Itself
WWV, WWVH and WWVB, and the world’s other time stations past and present. What a time station actually sells, how the signals are modulated second by second, the antennas and transmitters, the year WWV nearly closed, and the loss of CHU.
VHF/UHF Digital Voice Guides & Tools
Amateur digital voice comes in six modes: DMR, D-STAR, C4FM, M17, P25, and NXDN. They're built on the same handful of ideas, so once those click, the rest follows. The guides explain how each one works in plain language, and the tools let you see the ideas in action.
All the guides and tools on one page →
Start Here
- Top Ten Must-Knows for the New Digital Voice Ham
- The Digital Voice Modes Quiz — Test Yourself on over 900 QuestionsInteractive
- Which Mode Is Right for You?
- Pros and Cons of the Six Modes
- Digital Voice Modes Compared
- Each Digital Mode Explained (in Brief)
- Rosetta Stone for the Digital Modes
- What Bands Is Digital Voice On?
- Where to Listen — Find Live Activity
Interactive Tools
- The 4FSK BenchTool
- The Spectrum BenchTool
- The Digital CliffInteractive
- Interoperability Truth TableInteractive
- Simplex Range: Which Mode Goes Further?Interactive
- The Three Vocoder FamiliesInteractive
Understanding Digital Voice
DMR
- DMR Guide — The Most Popular Mode
- How to Be Successful with DMR
- Setting Your DMR TX Audio Level
- Handheld and Hotspot Troubleshooting for Digital Voice
- How DMR Works
- Two Conversations, One Channel: TDMA
- Talkgroups & Time Slots
- How a DMR Repeater Works
- How a DMR Repeater Is Built
- How a DMR Network Works
- BrandMeister and TGIF Compared
- DMR Networks Beyond BM & TGIF
- How Digital Voice Modes Are Linked, and How Large Multimode Networks Are Built
- The DMR Codeplug
- Scanning with a DMR Radio
- How AnyTone Digital Monitor Works
- DMR ID Registration & Numbering
- MCC — the Mobile Country Code
- Talker Alias
- What Else DMR Can Do
- Echo, Unlink, Status — Service Numbers
- The DMR Gateway
- Padded Talkgroups & Rewrite Rules
- HBlink3 — Homebrew Link 3
- DMR High-Power Hotspots
- History of DMR in Amateur Radio
D-STAR
C4FM / System Fusion
M17
P25
NXDN
MULTI-MODE
Networks & Cross-Mode Linking
Hotspots, Hardware & Software
SharkRF Devices
Manuals
- What the openSPOT4 Pro Manual Assumes You Already Know
- What the M1KE Manual Assumes You Already Know
Reference Cards
openSPOT 4 Pro
- Control CodesPDF
- Cross ModesPDF
M1KE
- The Seven ButtonsPDF
- Reading the ScreenPDF
- DMR LinkingPDF
- TroubleshootingPDF
- ConnectorsPDF
- Profiles & NetworkPDF
- Web InterfacePDF
- All Seven CardsPDF
Radio Manual Quick Reference Guides
Reference
- AM Broadcast Band: Facts, Figures and Trivia — for North America and the USASearchable
- AM Broadcast Band Trivia Challenge — Test Yourself on 294 QuestionsInteractive
- AM Broadcast Band: Facts, Figures and Trivia — Full Book Table of Contents
- A Tale of Two Arrays — How an AM Station's Directional Pattern Is Decided
- Flea Power — Why AM Stations Drop to a Handful of Watts After Dark
Shortwave History in the United States
- Shortwave from America — U.S. International Broadcast Stations, Past and Present
- Time Stations: Standard-Frequency and Time-Signal Radio, Past and Present
- Coast Stations: U.S. Ship-to-Shore Radio, Past and Present
- AT&T Long Distance via Shortwave — How America Phoned the World, 1927–1975
- Wall Street on Shortwave: High-Frequency Trading and the Return to HF
- Broadband over Power Line — the HF noise machine the ARRL spent years fighting
- Log-Periodic Antennas — The Broadband Workhorse
International Callsign Prefixes, MCC Codes and MCC Census
DMR, YSF, XLX, M17, NXDN, P25 Talkgroup & Reflector Cross-Reference
N6JET Scanner Station
- Multimode USRP Fanout Bridge
- Multi-Destination DG-ID Gateway
- M17-to-AllStar/EchoLink Bridge
- M17-SVX Reflector Bridge
- M17JET Channel K — VHF/UHF Remote Base (under development)
- AR-880-JET README (patch details)
- AR-880-JET Fix Guide (PDF)