Fldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported. It can help calibrate a sound card to a time signal and do frequency measurement tests.
NOTICE: You must proceed to the Files section to locate the correct fldigi, flrig etal download for your particular operating system. Do not blithely use the big green Download button! Use the "Files" menu item or the "Browse All Files" link.
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Ham RadioLicense
GNU General Public License version 3.0 (GPLv3)Follow fldigi
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User Reviews
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Love this project! The current version (14.1.16) will not work Mac OS X Big Sur (11.0.1), but the beta version (4.1.16.02) seems to work ok. Thanks to the team for addressing this issue so quickly!
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The responsiveness of the Dev Team via groups.io is superior.
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Thank you for a great piece of software, and for the support.
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FLDigi does everything I need for the non-WSJT-X modes. The author is very responsive to bug reports and feature enhancements. Design-wise had to drop it 1 star mainly because the complexity makes the software a little difficult to use/understand and as such the 600+ page manual makes for daunting reading. Mike
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UI is counter-intuitive; the amount of show stopper bugs is huge for a mature piece of software like this. Crashes if a wrong button is pressed.