Digital Amateur Radio

Digital amateur radio refers to any mode where information — voice, text, images, or data — is converted into a digital signal before being sent over the air, rather than transmitted as analog audio. Instead of your voice directly modulating a carrier wave, a computer or the radio's internal processor encodes it into a stream of data, which is then transmitted and decoded back into voice, text, or an image at the other end.

This isn't one technology — it's an umbrella covering a wide range of modes that have grown up over the last few decades, each solving a different problem: better voice quality, working weak signals below the noise floor, sending text or images, or linking repeaters together over the internet so a handheld in Ohio can talk to someone across the world.

These modes run on HF (and sometimes VHF/UHF) through a computer connected to your radio via a sound-card interface or USB audio. They've revolutionized HF operating — a modest station with a wire antenna can now work most of the world on a good band opening.

Winlink — Email Over Radio

Winlink allows hams to send and receive email via radio with no internet required at the client end. Messages route through a global network of relay stations (RMS gateways) and can be delivered to any standard email address when the gateway has internet. Critical for EmComm — BARC and GCARES use Winlink for formal ICS forms, health & welfare messages, and situational reports when conventional communications are unavailable.

Digital voice modes encode audio as data — providing clearer audio, caller ID display, and internet linking into worldwide networks not available on analog FM. The three main systems don't interoperate with each other, so the practical choice usually comes down to what's active locally.

APRS broadcasts GPS position, status messages, and short text over VHF, widely used for tracking mobile stations, weather stations, and event/net logistics. BARC uses APRS at public service events to track volunteer positions along parade routes and race courses, and for Field Day coordination.

A hotspot is a small personal device — usually a Raspberry Pi with an MMDVM radio board — that bridges a handheld radio to digital voice networks over the internet at very low power (typically 10–100mW). This gives access to DMR, D-STAR, System Fusion, and M17 networks regardless of local repeater coverage, and is a big reason digital voice has spread far beyond areas with established repeater infrastructure.

Nearly all digital modes rely on a computer, and the software ecosystem around amateur radio has grown into a rich set of free and commercial tools. Getting a computer talking to a radio cleanly requires thinking about two connections separately: audio (the actual digital signal) and CAT/rig control (letting software change frequency, mode, and PTT).

Digital Mode Software

Logging & Station Management

Single-Board Computers in Amateur Radio

Raspberry Pi and similar single-board computers have transformed what a small, inexpensive device can do on the amateur radio desktop — and in the field.