fldigi ☆
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Description:
Ham radio digital modem application
Type: Cask  |  Latest Version: 4.2.11@0  |  Tracked Since: Dec 17, 2025
Links: Homepage  |  formulae.brew.sh
Category: Networking
Tags: ham-radio digital-modes modem amateur-radio communication
Install: brew install --cask fldigi
About:
FLdigi is a cross-platform software modem application for amateur radio operators. It enables computers to transmit and receive digital signals over radio, supporting a wide array of modulation modes including PSK31, RTTY, and Olivia. This tool is essential for keyboard-to-keyboard chat, data transmission, and weak signal communication.
Key Features:
  • Supports over 100 digital modes including PSK31, RTTY, and Olivia
  • Integrated rig control for transceiver frequency synchronization
  • Built-in macros for automated message transmission
  • Audio spectrum analysis and waterfall display
Use Cases:
  • Keyboard-to-keyboard text communication over HF radio
  • Transmitting and receiving weather data or bulletins
  • Emergency communication when voice channels are unavailable
Alternatives:
  • WSJT-X – Specialized for weak-signal modes like FT8 and JT65, whereas FLdigi offers a broader range of traditional modes.
  • CQRLOG – Primarily a logging application, not a direct modem replacement.
Version History
Detected Version Rev Change Commit
May 12, 2026 12:21pm 4.2.11 0 VERSION_BUMP 263abb26
Dec 18, 2025 4:20am 4.2.10 0 VERSION_BUMP 44a5f698
Sep 15, 2025 11:39am 4.2.09 0 VERSION_BUMP 510829a4
Sep 8, 2025 7:52pm 4.2.09 0 VERSION_BUMP 858643af
Jan 16, 2024 11:53pm 4.2.04 0 VERSION_BUMP e09d9fd6
Nov 2, 2023 10:26am 4.2.03 0 VERSION_BUMP f2df3bf4
Nov 1, 2023 7:13pm 4.2.03 0 VERSION_BUMP 946b7b23
Oct 31, 2023 9:44am 4.2.02 0 VERSION_BUMP a4e5253f
Sep 2, 2023 7:57pm 4.2.00 0 VERSION_BUMP d18420f3
Mar 19, 2023 5:19am 4.1.26 0 VERSION_BUMP 6b0b5d72
Mar 14, 2023 9:27pm 4.1.26 0 VERSION_BUMP 91ccc929
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