Fldigi (short for Fast light digital) is a

free and open-source Free and open-source software (FOSS) is software available under a Software license, license that grants users the right to use, modify, and distribute the software modified or not to everyone free of charge. FOSS is an inclusive umbrella term ...

program which allows an ordinary computer's

sound card A sound card (also known as an audio card) is an internal expansion card that provides input and output of audio signals to and from a computer under the control of computer programs. The term ''sound card'' is also applied to external audio ...

to be used as a simple two-way data modem. The software is mostly used by

amateur radio operator An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service. Amateur radio operators ...

s who connect the

microphone A microphone, colloquially called a mic (), or mike, is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and publi ...

and

headphone Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an ...

connections of an

amateur radio Amateur radio, also known as ham radio, is the use of the radio frequency radio spectrum, spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emer ...

SSB or FM

transceiver In radio communication, a transceiver is an electronic device which is a combination of a radio ''trans''mitter and a re''ceiver'', hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. The ...

to the computer's headphone and microphone connections, respectively. This interconnection creates a "sound card defined radio" whose available

bandwidth Bandwidth commonly refers to: * Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range * Bandwidth (computing), the rate of data transfer, bit rate or thr ...

is limited by the sound card's sample rate and the external radio's bandwidth. Such communications are normally done on the

shortwave Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW). There is no official definition of the band range, but it always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (app ...

amateur radio bands in modes such as

PSK31 PSK31 or "Phase-shift keying, Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard Synchronous co ...

MFSK Multiple frequency-shift keying (MFSK) is a variation of frequency-shift keying (FSK) that uses more than two frequencies. MFSK is a form of M-ary transmission, M-ary orthogonal modulation, where each symbol consists of one element from an alphabe ...

, RTTY, Olivia, and CW (Morse code). Increasingly, the software is also being used for data on VHF and

UHF Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter ...

frequencies using faster modes such as 8-PSK. Using this software, it is possible for

s to communicate worldwide while using only a few watts of RF power. Fldigi software is also used for amateur radio emergency communications when other communication systems fail due to natural disaster or power outage. Transfer of files, emails, and FEMA ICS forms are possible using inexpensive radio hardware.NBEMS — a Digital Emcomm Tool
w1hkj.com

Supported digital modes

Portability

Operating systems

Fldigi is based on the lightweight portable graphics library

FLTK Fast Light Toolkit (FLTK) is a cross-platform widget (graphical control element) library for graphical user interfaces (GUIs), developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but ...

and the C/ C++ language. Because of this, the software can run on many different

operating system An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs. Time-sharing operating systems scheduler (computing), schedule tasks for ...

s such as: *

Microsoft Windows Windows is a Product lining, product line of Proprietary software, proprietary graphical user interface, graphical operating systems developed and marketed by Microsoft. It is grouped into families and subfamilies that cater to particular sec ...

(

2000 2000 was designated as the International Year for the Culture of Peace and the World Mathematics, Mathematical Year. Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium, because of a tende ...

or newer) *

macOS macOS, previously OS X and originally Mac OS X, is a Unix, Unix-based operating system developed and marketed by Apple Inc., Apple since 2001. It is the current operating system for Apple's Mac (computer), Mac computers. With ...

Linux Linux ( ) is a family of open source Unix-like operating systems based on the Linux kernel, an kernel (operating system), operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically package manager, pac ...

, *

FreeBSD FreeBSD is a free-software Unix-like operating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD, one of the first fully functional and free Unix clones on affordable ...

, *

OpenBSD OpenBSD is a security-focused operating system, security-focused, free software, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by fork (software development), forking NetBSD ...

, *

NetBSD NetBSD is a free and open-source Unix-like operating system based on the Berkeley Software Distribution (BSD). It was the first open-source BSD descendant officially released after 386BSD was fork (software development), forked. It continues to ...

, *

Solaris Solaris is the Latin word for sun. It may refer to: Arts and entertainment Literature, television and film * ''Solaris'' (novel), a 1961 science fiction novel by Stanisław Lem ** ''Solaris'' (1968 film), directed by Boris Nirenburg ** ''Sol ...

. Additionally, Fldigi is designed to compile and run on any

POSIX The Portable Operating System Interface (POSIX; ) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. POSIX defines application programming interfaces (APIs), along with comm ...

compliant

that uses an

X11 The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X originated as part of Project Athena at Massachusetts Institute of Technology (MIT) in 1984. The X protocol has been at ...

compatible window system /

graphical user interface A graphical user interface, or GUI, is a form of user interface that allows user (computing), users to human–computer interaction, interact with electronic devices through Graphics, graphical icon (computing), icons and visual indicators such ...

Architectures

The Fldigi software is written in highly

portable Portable may refer to: General * Portable building, a manufactured structure that is built off site and moved in upon completion of site and utility work * Portable classroom, a temporary building installed on the grounds of a school to provide a ...

C/ C++ and can be used on many

CPU A central processing unit (CPU), also called a central processor, main processor, or just processor, is the primary processor in a given computer. Its electronic circuitry executes instructions of a computer program, such as arithmetic, log ...

architectures, including: *

amd64 x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit extension of the x86 instruction set. It was announced in 1999 and first available in the AMD Opteron family in 2003. It introduces two new operating modes: 64-bit mode an ...

i386 The Intel 386, originally released as the 80386 and later renamed i386, is the third-generation x86 architecture microprocessor from Intel. It was the first 32-bit processor in the line, making it a significant evolution in the x86 archite ...

* armhf/armel *

ia64 IA-64 (Intel Itanium architecture) is the instruction set architecture (ISA) of the discontinued Itanium family of 64-bit Intel microprocessors. The basic ISA specification originated at Hewlett-Packard (HP), and was subsequently implemented b ...

* mips *

mipsel MIPS (Microprocessor without Interlocked Pipelined Stages) is a family of reduced instruction set computer (RISC) instruction set architectures (ISA)Price, Charles (September 1995). ''MIPS IV Instruction Set'' (Revision 3.2), MIPS Technologies, ...

powerpc PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., App ...

* s390 *

s390x S39 may refer to: Aviation * Blériot-SPAD S.39, a French reconnaissance aircraft * Letov Š-39, a Czechoslovakian sport aircraft * Prineville Airport, in Crook County, Oregon, United States * Sikorsky S-39, an American flying boat Other us ...

* sparc *

Raspberry Pi Raspberry Pi ( ) is a series of small single-board computers (SBCs) developed in the United Kingdom by the Raspberry Pi Foundation in collaboration with Broadcom Inc., Broadcom. To commercialize the product and support its growing demand, the ...

Sound systems

Multiple sound systems are supported by Fldigi, allowing the program to abstract the

hardware across differing hardware and operating systems. *

Open Sound System The Open Sound System (OSS) is an interface for making and capturing sound in Unix and Unix-like operating systems. It is based on standard Unix devices system calls (i.e. POSIX read, write, ioctl, etc.). The term also sometimes refers to ...

(OSS) * PortAudio * PulseAudio *Read / write to WAV files (file I/O)

Features

* NBEMS: The narrowband emergency messaging system * Support for transmitting and receiving in all languages by using

UTF-8 UTF-8 is a character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from ''Unicode Transformation Format 8-bit''. Almost every webpage is transmitted as UTF-8. UTF-8 supports all 1,112,0 ...

character encoding Character encoding is the process of assigning numbers to graphical character (computing), characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using computers. The numerical v ...

(some modes) * Connection to external programs via TCP/IP port 7322 * Ability to be used as a

KISS A kiss is the touching or pressing of one's lips against another person, animal or object. Cultural connotations of kissing vary widely; depending on the culture and context, a kiss can express sentiments of love, passion, romance, sex ...

modem via TCP/IP port 7342 * Dual-tone multi-frequency (DTMF) encoding and decoding * Automatic switching of mode and frequency by use of Reed Solomon Identifier signal identification * Inbuilt macro language and processor for programmable automated control * Sound card oscillator frequency/skew correction * Measure sound card

oscillator Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples of oscillation include a swinging pendulum ...

's skew to

atomic clock An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions betwee ...

: WWV or

WWVH WWVH is the callsign of the U.S. National Institute of Standards and Technology's shortwave radio time signal station located at the Pacific Missile Range Facility, Pacific Missile Range Facility Barking Sands, in Kekaha, Hawaii, Kekaha, on the ...

* Measure RF receiver

frequency Frequency is the number of occurrences of a repeating event per unit of time. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio ...

skew to

: WWV or

* Transmit a WWV-like time signal as a calibration reference * Control of external transmit / receive radio hardware by using GPIO pins. (For embedded hardware) * Simultaneous decoding of multiple

morse code Morse code is a telecommunications method which Character encoding, encodes Written language, text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code i ...

( CW) signals. * Decoding of

( CW) by

self-organizing map A self-organizing map (SOM) or self-organizing feature map (SOFM) is an unsupervised machine learning technique used to produce a low-dimensional (typically two-dimensional) representation of a higher-dimensional data set while preserving the t ...

artificial neural network In machine learning, a neural network (also artificial neural network or neural net, abbreviated ANN or NN) is a computational model inspired by the structure and functions of biological neural networks. A neural network consists of connected ...

(trained

artificial intelligence Artificial intelligence (AI) is the capability of computer, computational systems to perform tasks typically associated with human intelligence, such as learning, reasoning, problem-solving, perception, and decision-making. It is a field of re ...

)

The Fldigi Suite

The "Fldigi Suite" consists of the Fldigi modem and all extension programs released by the same development group. Most of these extensions add more capabilities to Fldigi such as verified file transfer and message passing. Interconnection between these programs and the Fldigi modem is made over TCP/IP port 7322. Some of the Suite are however standalone programs used for utility or testing purposes only, with no connection to the Fldigi main modem.

Flamp

Flamp implements the Amateur Multicast Protocol by Dave Freese, W1HKJ and is a tool for connectionless transferring of files to multiple users simultaneously without requiring any existing infrastructure. The program breaks a given file into multiple smaller pieces, checksums each piece, then transmits each piece one or more times. When all parts are correctly received the sent file is re-assembled and can be saved by receiving stations. This program is useful for

multicast In computer networking, multicast is a type of group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast differs from ph ...

ing files over lossy connections such as those found on

High frequency High frequency (HF) is the ITU designation for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one ...

(HF) or during emergency communications.

Flarq

Flarq implements the ARQ specification developed by Paul Schmidt, K9PS to transfer emails,

text file A text file (sometimes spelled textfile; an old alternative name is flat file) is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists stored as data within a computer file system. In ope ...

s, images, and

binary file A binary file is a computer file that is not a text file. The term "binary file" is often used as a term meaning "non-text file". Many binary file formats contain parts that can be interpreted as text; for example, some computer document files ...

s over radio. This protocol is

unicast Unicast is data transmission from a single sender (red) to a single receiver (green). Other devices on the network (yellow) do not participate in the communication. In computer networking, unicast is a one-to-one transmission from one point in ...

and connection-based. The software seamlessly integrates with existing email clients such as

Microsoft Outlook Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft 365 software suites. Primarily popular as an email client for businesses, Outlook also includes functions such as Calendari ...

Mozilla Thunderbird Mozilla Thunderbird is a free and open-source email client that also functions as a personal information manager with a Digital calendar, calendar and contactbook, as well as an RSS feed reader, chat client (IRC/XMPP/Matrix (protocol), Matrix), ...

, and Sylpheed.

Flmsg

Flmsg allows users to send, receive, edit, and create pre-formatted forms. Such a system speeds the flow of information during emergency communications. The software has a number of forms built-in including

FEMA The Federal Emergency Management Agency (FEMA) is an agency of the United States Department of Homeland Security (DHS), initially created under President Jimmy Carter by Presidential Reorganization Plan No. 3 of 1978 and implemented by two Exec ...

ICS forms,

MARS Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide () atmosphere. At the average surface level the atmosph ...

reports & messages, Hospital ICS forms,

Red Cross The organized International Red Cross and Red Crescent Movement is a Humanitarianism, humanitarian movement with approximately 16million volunteering, volunteers, members, and staff worldwide. It was founded to protect human life and health, to ...

messages, IARU and NTS messages.

Flwrap

Flwrap is a tool for the sending of files using a simplified

drag and drop In computer graphical user interfaces, drag and drop is a pointing device gesture in which the user (computing), user selects a virtual object by "grabbing" it and dragging it to a different location or onto another virtual object. In general, i ...

interface. Data compression is available also, which reduces data transfer times.

FLNet

FLNet assists net control operators in keeping track of multiple stations during digital amateur radio nets.

FLLog

FLLog is a logging software which keeps track of conversations between amateur radio operators in a database format known as ADIF.

FLWkey

FLWkey is a simple interface to control an external piece of hardware called a Winkeyer. This is a

Morse code Morse code is a telecommunications method which Character encoding, encodes Written language, text characters as standardized sequences of two different signal durations, called ''dots'' and ''dashes'', or ''dits'' and ''dahs''. Morse code i ...

keyer A keyer is an electronic device used for signaling by hand, by way of pressing one or more switches. The technical term keyer has two very similar meanings, which are nonetheless distinct: One for telegraphy and the other for accessory devices bui ...

which is adjustable via computer commands over

USB Universal Serial Bus (USB) is an industry standard, developed by USB Implementers Forum (USB-IF), for digital data transmission and power delivery between many types of electronics. It specifies the architecture, in particular the physical ...

Flcluster

This is a telnet client to remote DX cluster servers, which is a real-time reporting of stations heard transmitting, and their frequencies. It does not connect to Fldigi.

Flaa

Flaa is a control program for use with the RigExpert AA-xxxx series of antenna analyzers, and does not connect to Fldigi.

Flrig

FLRig is a component of the FLDigi suite of applications that enables computer aided control of various radios using a serial or USB connection. Using FLRig in combination with FLDigi, events such as frequency, power level, receiver gain and audio gain may be adjusted from the computer automatically or by user intervention.

Test tools

The Fldigi development group also releases a number of open-source programs which assist in the testing, development, and comparison of different modes within Fldigi, such as LinSim, CompText, and CompTTY.

RSID

To identify the mode being transmitted a signal called an RSID, or Reed-Solomon Identifier, can be transmitted before the data. Using this identifier the receiving software can automatically switch to the proper mode for decoding. The assigning of these identifiers to new modes is coordinated to ensure inter-operation between programs. Currently 7 sound card-digital-modem programs support this standard: * PocketDigi * FDMDV * DM780 * Multipsk * Fldigi * AndFlmsg * TIVAR RSID operates by sending a short burst of a specific modulation before the data signal, which can be used to automatically identify over 272 digital modes. This burst consists of a 10.766 baud 16-tone MFSK modulation where 15 tones/symbols are sent. The burst occupies 172 Hz of bandwidth and lasts for 1.4 seconds.

Software architecture

For simple keyboard-to-keyboard communication Fldigi can be operated using just the main window. For more complex uses or file transfer external programs can be attached to the internal TCP/UDP ports 7322 (ARQ), 7342 (KISS), and 7362 (XML-RPC). The image below helps to illustrate the interconnections and signal-flow within the Fldigi architecture. FLdigi FLowchart

Community-provided extensions

Fldigi allows external programs to attach and send / receive data by connecting to

port A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as Hamburg, Manch ...

7322/ ARQ or 7342/

. When used this way, Fldigi and the computer's sound card are acting as a " softmodem" allowing text or data sent on one computer to be transferred using the wireless radio link in-between. Programs which have a history of use with Fldigi as the underlying modem include: * D-Rats - easy to use chatrooms, email, and file transfer over-radio. * PSKmail - send and receive on-internet e-mail over a remote radio connection. * Fldigiattach - attach Fldigi as modem for Linux AX.25 and

TCP/IP The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suite are ...

connections. * UIChat - Java-based amateur radio chat program. * LinkUP - Program for unattended operation and person to person chat. *

- Fldigi can be used in Linux as a KISS (TNC) modem for AX.25 and

connections.

Awards and recognitions

* At the 2014 Dayton Hamvention the project lead, Dave Freese (W1HKJ), was recognized with the Technical Excellence Award "for his development and distribution of the Fast Light Digital Modem Application (fldigi) family of programs for use in amateur and emergency communications." * Fldigi was selected as SourceForge's June 2017 Staff 'Project of the Month' * Fldigi was one of SourceForge's 'Projects of the Week' for Oct 17, 2016 * Fldigi was selected as SourceForge's December 2017 Community Choice 'Project of the Month'

Notable users

Disaster relief services

The software is also utilized by some organizations for both routine and disaster/emergency relief services. * Multiple state and county emergency operations centers * W1AW (

ARRL The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States. ARRL is a non-profit organization and was co-founded on April 6, 1914, by Hiram Percy Maxim and Clarence D. Tuska of H ...

) * Amateur Radio Emergency Service (ARES) *

Radio Amateur Civil Emergency Service The Radio Amateur Civil Emergency Service (RACES) is an emergency radio service authorized in Part 97.407 of the Federal Communications Commission (FCC) rules and regulations governing amateur radio in the United States.Civil Air Patrol Civil Air Patrol (CAP) is a Congressional charter, congressionally chartered, federally supported Nonprofit corporation, non-profit corporation that serves as the official civilian auxiliaries, auxiliary of the United States Air Force (USAF). CA ...

(CAP) * SATERN, the

Salvation Army The Salvation Army (TSA) is a Protestantism, Protestant Christian church and an international charitable organisation headquartered in London, England. It is aligned with the Wesleyan-Holiness movement. The organisation reports a worldwide m ...

Team Emergency Radio Network *

SKYWARN Skywarn (sometimes stylized as SKYWARN) is a program of the National Weather Service (NWS). Its mission is to collect reports of localized severe weather in the United States. These reports are used to aid forecasters in issuing and verifying sev ...

a program of the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

National Weather Service The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...

(NWS) whose mission is to collect reports of localized severe weather.

Shortwave broadcasters

Following the successful tests by the

Voice of America Voice of America (VOA or VoA) is an international broadcasting network funded by the federal government of the United States that by law has editorial independence from the government. It is the largest and oldest of the American internation ...

's VOA Radiogram program, international and government shortwave broadcasters began testing and experimenting with digital data over shortwave broadcast channels using the Fldigi software. These tests led to regular weekly digital broadcasts by the broadcasters listed below. * VOA Radiogram, service terminated in 2017 and continuing as Shortwave Radiogram. * In June 2017, following the demise of VOA Radiogram
Shortwave Radiogram
began broadcasting digital data-streams using Fldigi via WRMI in

Miami Miami is a East Coast of the United States, coastal city in the U.S. state of Florida and the county seat of Miami-Dade County, Florida, Miami-Dade County in South Florida. It is the core of the Miami metropolitan area, which, with a populat ...

and ''Space Line'
Spaceline Bulgaria - Broadcasting Airtime on shortwave, satellite and internet
in

Bulgaria Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...

. *

Radio Havana Cuba Radio Havana Cuba (, RHC) is the official government-run international broadcasting station of Cuba. It can be heard in many parts of the world, including the United States, on shortwave frequencies. Radio Havana Cuba, along with Radio Rebelde, C ...

Radio Moscow Radio Moscow (), also known as Radio Moscow World Service, was the official international broadcasting station of the Union of Soviet Socialist Republics until 1993, when it was reorganized into Voice of Russia, which was subsequently reorga ...

Radio Australia ABC Radio Australia, also known as Radio Australia, is the international broadcasting and online service operated by the Australian Broadcasting Corporation (ABC), Australia's public broadcaster. Most programming is in English, with some in Tok ...

* Radio Miami International * Italian Broadcasting Corporation *

WBCQ (SW) WBCQ is a shortwave radio station operating at Monticello, Maine, United States. The station is owned and operated by Allan Weiner, who also owns and operates WXME AM 780 kHz and WBCQ-FM 94.7 MHz at the shortwave site. WBCQ began operatio ...

* Mighty KBC

MARS

The Fldigi suite of programs has become popular within the

U.S. Army The United States Army (USA) is the primary land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of the United Stat ...

and U.S. Air Force Military Auxiliary Radio System.

Department of Homeland Security

Fldigi is being used in-testing as part of the

Department of Homeland Security The United States Department of Homeland Security (DHS) is the U.S. federal executive department responsible for public security, roughly comparable to the interior, home, or public security ministries in other countries. Its missions invol ...

Shares program, which utilizes "existing HF radio resources of government, critical infrastructure, and disaster response organizations to coordinate and transmit emergency messages"

PSK Mail

Fldigi is used as the underlying modem for the PSKmail project. PSK Mail allows users to retrieve and send normal emails over radio.

AirChat

In 2014, the group

Anonymous Anonymous may refer to: * Anonymity, the state of an individual's identity, or personally identifiable information, being publicly unknown ** Anonymous work, a work of art or literature that has an unnamed or unknown creator or author * Anonym ...

released a communications tool named AirChat, which used Fldigi as the underlying modem. This provided a low speed yet reliable data connection using only moderate radio hardware. The AirChat software allows for anonymous transmissions of both

encrypted In cryptography, encryption (more specifically, encoding) is the process of transforming information in a way that, ideally, only authorized parties can decode. This process converts the original representation of the information, known as plain ...

and unencrypted messages over unencrypted channels.

Decodeable broadcasts

The broadcasts listed below are transmitted on a regular schedule and can be decoded using Fldigi. * SITOR text forecasts and storm warnings * WEFAX visual weather fax * SYNOP surface synoptic observations * NAVTEX warnings, forecasts, and safety information broadcasts * VOA Radiogram Broadcasts * W1AW Broadcasts

References

External links

* {{Digital modes Quantized radio modulation modes Amateur radio software Amateur radio software for Linux Amateur radio software for Windows Free communication software Amateur radio software for macOS