Digital Modes in Amateur Radio: What License Do You Need?

Digital modes have become a dominant part of HF amateur radio in the past decade. From the revolutionary FT8 to classic PSK31 and propagation-monitoring WSPR, digital modes allow operators to make contacts at signal levels far below what voice or Morse code can manage. Understanding which modes are available at each license class is essential for new operators planning their HF activities.

License Classes and Digital Mode Access

Digital modes are permitted on the same frequency segments as other data and phone operation for each license class:

• Technician: Digital modes on 10 meters (28.0–28.3 MHz) and on VHF/UHF bands
• General: Digital modes on General-class HF segments of 80, 40, 20, 15, and 10 meters, plus 17 and 12 meters (full privileges)
• Extra: Full digital privileges on all amateur HF bands

Popular Digital Modes

FT8

FT8, developed by Joe Taylor (K1JT) and Steve Franke (K9AN), uses 15-second transmission cycles and advanced error correction to complete contacts at signal levels 10–15 dB weaker than SSB voice. It has become the dominant HF mode for casual DX contacts and is responsible for a significant portion of all HF contacts logged globally.

WSPR

Weak Signal Propagation Reporter (WSPR) is a beacon and propagation monitoring mode. Stations transmit a standard beacon message, and receiving stations upload reports to a central database (wsprnet.org), creating a real-time picture of worldwide propagation. WSPR requires minimal power and is excellent for monitoring ionospheric conditions.

PSK31

Phase Shift Keying 31 (PSK31) was the dominant digital mode before FT8. It uses a narrow bandwidth and is well-suited for keyboard-to-keyboard text conversations on HF — a digital replacement for voice ragchewing.

Software Requirements

Most digital modes are operated via computer software connected to your radio's audio input/output. WSJT-X is the standard software for FT8, FT4, WSPR, and other weak-signal modes. Fldigi covers PSK31, RTTY, and many other classic digital modes. All are free and open-source.