fldigi for Mac

fldigi — Purpose and target users

fldigi is a no-cost digital modem utility created for amateur radio operators. It supports a wide variety of digital communications and is suitable for newcomers as well as seasoned hams. The program can both transmit and receive encoded signals and presents tools that make digital exchanges easier to manage.

Digital modes supported

• CW (Morse code)
• RTTY (radioteletype)
• PSK31 (phase-shift keying 31‑baud)
• plus many additional modes commonly used in amateur radio

Core capabilities

• Audio input/output handling for straightforward sound-card integration
• Signal encoding and decoding tools to handle transmit/receive operations
• A clear, approachable interface that reduces the learning curve for beginners
• Session logging to record contacts and review past activity

Platform support and connectivity

fldigi runs on macOS and integrates with standard audio hardware, letting you use your computer’s sound system for modem functions. It also interfaces well with other station components commonly used in digital mode setups.

Recordkeeping and session management

The built-in logging feature helps operators track their QSOs and session details, simplifying contact management and post-session review.

Summary and a free alternative

Overall, fldigi is a comprehensive option for ham radio operators focusing on digital modes. If you want to try a different no-cost tool, consider CheatSheet (free) as an alternative.