Manual Reference Pages - FLDIGI (1)
fldigi - digital modem program for hamradio operators
Fldigi is a cross-platform multi-modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, MT-63, RTTY, Hellschreiber, DominoEX, Olivia, THOR and Throb are all supported. It can also help calibrate a sound card to a time signal and do on-air frequency measurement tests. Fldigi features basic rig control, logging, and contest operation, panoramic PSK decoding, a PSK Reporter client, and remote control via XML-RPC.
Long options begin with two hyphens and are handled by fldigi. The option names may be abbreviated to any unambiguous substring, and the option argument may be separated from the name by a space or equals sign, as per getopt(3).
Short options begin with a single hyphen and are passed directly to FLTK. They may be abbreviated only as indicated.
Look for and store configuration files in directory
DIRECTORY, which is created if it does not exist. Defaults to $HOME/.fldigi.
Set the receive message queue key. May be given in hex if prefixed with 0x. Defaults to 9876 or 0x2694.
Set the transmit message queue key. May be given in hex if prefixed with 0x. Defaults to 6789 or 0x1a85.
Set the ARQ TCP server address. Defaults to 127.0.0.1.
may be any
string accepted by
Set the ARQ TCP server port. Defaults to 7322.
may be any
string accepted by
The --xmlrpc-* options are only available if fldigi was built with XML-RPC support.
Set the XML-RPC server address. Defaults to 127.0.0.1.
Set the XML-RPC server port. Defaults to 7362.
Allow only the methods whose names match
is a POSIX extended regular expression.
Allow only the methods whose names do not match
List all available XML-RPC methods and exit. May be preceded by the
options to verify their effect.
Perform the CPU speed test that is normally done when fldigi is run without an existing configuration directory. Results are shown in the event log and options may be changed to the recommended values for the measured CPU speed.
Unhide controls for adding noise to the transmitted signal.
Hide all main window widgets except the menu bar and waterfall (with its associated controls). Meant to be used with external programs that control fldigi with XML-RPC.
Set the event log verbosity.
is clamped to the range [0,5]; for
Debug. Defaults to 3 (Info).
Print version information and exit.
Print build information and exit.
Print options summary and exit.
Standard FLTK options
-bg, -background COLOUR
Set the background colour.
-bg2, -background2 COLOUR
Set the secondary (text) background colour.
-di, -display DISPLAY
Specifies the X server to connect to; see
-dn, -dnd or -nodn, -nodnd
Enable or disable drag and drop copy and paste in text fields.
-fg, -foreground COLOUR
Set the foreground colour.
-g, -geometry GEOMETRY
Set the initial window size and position.
Fldigi may not honour this option.
Start fldigi in iconified state.
Fldigi may not honour this option.
-k, -kbd or -nok, -nokbd
Enable or disable visible keyboard focus in non-text widgets.
-na, -name CLASSNAME
Set the window class. Defaults to Fldigi.
-ti, -title WINDOWTITLE
Set the window title. Defaults to fldigi - <callsign>.
Additional UI options
Set the widget font and (optionally) size. Defaults to sans:12.
Options useful to developers
The --benchmark-* options are only enabled if fldigi was built (exclusively) for benchmarking and batch decoding.
Specify the modem. Defaults to 25 (BPSK31).
Set the modem frequency in Hz. Defaults to 1000.
Enable or disable modem AFC. Defaults to false.
Enable or disable modem squelch. Defaults to false.
Set the modem squelch level (1100%). Defaults to 0.0.
Specify the input. Must be a positive integer indicating the number of samples of silence to generate as the input, or, if fldigi was linked with libsndfile, the name of the input audio file. The filename must contain non-digit characters.
Specify the output data file. Non-textual output (i.e. Hellschreiber or MFSK images) cannot be saved. Default: decoder output is discarded.
Specify the sample rate conversion ratio. Defaults to 1.0 (input is not resampled).
Set the sample rate conversion type. TYPE is an integer in the range [0,4]. Defaults to 2 (Fastest SINC Interpolator).
The following options should not be relied upon. They are listed here only for the sake of completeness, and may be replaced by GUI settings or removed altogether in a future version.
Set the waterfall width.
Set the waterfall height.
Set the minimum window width.
Set the minimum window height.
Run for approximately
Set frames per buffer option to
when creating PortAudio streams. Defaults to 0 (let PortAudio choose).
Fldigi uses several environment variables, mainly set for child processes created by the <EXEC> macro and the notifier.
The web browser to use for http and file URIs. Overrides
The following variables are created in the environment of the child process that is forked by the <EXEC> macro. They are empty if values are not available.
The receive message queue key.
The transmit message queue key.
The XML-RPC server address string.
The XML-RPC server port string.
The ARQ server address string.
The ARQ server port string.
The version string.
The process ID of the parent fldigi process.
The configuration directory.
The operators callsign.
The operators name.
The operators IARU (Maidenhead) locator.
The short modem name.
The long modem name.
The rig (radio) frequency.
The modem (audio) centre frequency.
The actual receive/transmit frequency, i.e. the sum of rig and modem frequencies taking into account the rig sideband.
The text (frequency in MHz) contained in the
The text (QSO start time) contained in the (time)
The text (QSO end time) contained in the (time)
The text (other stations callsign) contained in the
The text (other stations name) contained in the
The text (received RST) contained in the (RST)
The text (sent RST) contained in the (RST)
The text (other stations QTH) contained in the
The text (other stations Maidenhead locator) contained in the
The text (free-form notes) contained in the
The text (azimuth in degrees to other station) contained in the
The following variables are created in the environment of child processes created by the notifier.
These variables (i in [0,9]) contain substrings matched by capturing groups in the events regular expression. 0 contains the whole matched text.
The number of substrings available.
Builtin event types that match callsigns will place the callsign in this variable.
The complete string that matched the events regular expression.
The modem frequency.
The event type.
The stations country name (for events of type "station heard twice").
The following variables are only used if fldigi was built with debugging support (--enable-debug), or they are only useful when debugging specific modules.
If set, this variable disables glibcs malloc debugging, which fldigi enables by default when built for debugging.
Initialises hamlib in debug mode.
Fldigi is licensed under the GNU GPL, which grants you the right to run the program for any purpose (freedom 0). However, permission to use it for the transmission of radio signals can only be obtained from the communications authority of your country. When given, this permission almost always comes in the form of an amateur radio license.
If you do not have an amateur radio license you can still have fun using fldigi as a shortwave listener. One way to do so is by using the builtin PSK Reporter client to submit realtime spots of transmitting stations; see RESOURCES below. All you need is a computer, homebrew SDR receiver, and simple wire antenna!
Various files and subdirectories are created in $HOME/.fldigi. Some of the most interesting ones are listed below.
The main settings file.
The status file. Stores window geometries, button states, current modem, current audio frequency, squelch level, and so on.
The event log.
The default macro file.
This directory contains waterfall palettes.
This directory is added to the PATH environment variable of the child process that runs <EXEC> macros.
This directory contains logged received and sent text (when such logging is enabled), including the default logbook database, logbook.adif.
Received MFSK images are automatically saved in this directory.
This file is written by the frequency analysis modem. The fields are dial frequency, audio frequency, and offset. See documentation for details.
The following files are used if present. They must be downloaded and copied to ~/.fldigi/ by the user.
List of DXCC entities and callsign prefixes; used to display tooltips in the received text buffer, and also to auto-fill the Country, Locator and Azimuth log fields. Available at
List of known LOTW users (one callsign per line); used for the received text tooltips. Available at
AGMemberList.txt or eqsl.txt
List of Authenticity Guaranteed eQSL users (one callsign per line); used for the received text tooltips. Available at
fldigi --wfall-height 144 --font sans:11 -fg "#c0c0c0" -bg "#5f5f63" -bg2 "#19213b"
This is how the author of this document invokes fldigi.
fldigi --xmlrpc-deny "main.(tx|tune|run_macro)"
Unregister XML-RPC methods that may transmit.
ssh -L 7362:localhost:7362 remote-host xvfb-run fldigi -display :99
Start fldigi on
under a fake X server. (The
utility is available on Debian systems). The remote headless fldigi is then controlled via XML-RPC on port 7362, i.e from flrig, flamp etc.
fldigi --benchmark-input 480000 --benchmark-modem 1
Benchmark the DominoEX-4 modem with 480K audio samples.
fldigi --benchmark-input audio.wav --benchmark-modem 25 --benchmark-frequency 1500 --benchmark-afc 1 --benchmark-squelch 1 --benchmark-squelch-level 5.0 --benchmark-output out.txt
(whose sample rate must be 8000Hz in this case) and decode BPSK-31 signals at 1500Hz. AFC is enabled and the squelch is set to 5%. Decoded text is saved to
fldigi-shell(1), gmfsk(1), gpsk31(1), grig(1), rigctl(1), xlog(1), getaddrinfo(3), getopt(3), regex(7), X(7)
Main web site: http://www.w1hkj.com/Fldigi.html
BerliOS project page: http://developer.berlios.de/projects/fldigi/
Wiki and bug tracker: https://fedorahosted.org/fldigi/
More information on MFSK16, DominoEX and other digital modes can be found at http://www.qsl.net/zl1bpu/ and http://www.w1hkj.com/FldigiHelp/Modes/index.htm
The PSK Automatic Propagation Reporter site can be found at http://www.pskreporter.info/
Fldigi was written by
Leigh L. Klotz, Jr.,
Fldigi also includes code written by others. Among them are
This manual page was written by Stelios Bounanos <sb[at]enotty(dot)net>.
License GPLv3+: GNU GPL version 3 or later.
Visit the GSP FreeBSD Man Page Interface.
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