Fldigi
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A computer's sound card can function as a two-way data modem through the free and open-source program Fldigi.[1] Amateur radio operators are the primary users of this software, linking their transceiver's microphone and headphone connections to the corresponding computer jacks.[2] During natural disasters or power outages that disable other communication systems, Fldigi is utilized for amateur radio emergency communications.[3]
Key facts and history
Fldigi is written in C/C++ using the FLTK graphics library, allowing it to run on Windows, macOS, Linux, FreeBSD, OpenBSD, NetBSD, and Solaris.[4] The "Fldigi Suite" includes extension programs that add verified file transfer and message passing capabilities.[5] Flamp implements the Amateur Multicast Protocol for connectionless file transfer to multiple users simultaneously.[6] Fldigi can transmit a Reed-Solomon Identifier (RSID) before data to automatically identify over 272 digital modes.[7]
Any POSIX-compliant operating system that includes an X11 window system can compile and run Fldigi.[8] TCP/IP port 7322 is the interconnection point between the Fldigi modem and these programs.[5] Paul Schmidt, K9PS developed an ARQ specification that Flarq implements for unicast transfer of emails, text, images, and binary files over radio.[9][10] Pre-formatted forms such as FEMA ICS forms and Red Cross messages can be sent, received, edited, and created using Flmsg.[11]
A 16-tone MFSK modulation at 10.766 baud, occupying 172 Hz of bandwidth for 1.4 seconds, constitutes the RSID burst.[7]
What the cited sources add
With only moderate radio hardware, AirChat delivered a low-speed yet reliable data connection.[12]
References
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "Documentation/FAQ – fldigi", fedorahosted.org (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "Rolling Your Own with Digital Amateur Radio - Linux Journal", www.linuxjournal.com; "An Amateur Radio Survival Guide for Linux Users - Linux Journal", www.linuxjournal.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: Allocca, "Amateur Radio Emergency Communications Reference", Lulu.com; Introduction arrl.org; NBEMS — a Digital Emcomm Tool w1hkj.com; "FOSS for amateur radio [LWN.net]", lwn.net (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "Package: fldigi (3.22.01-1)", Debian; "FreeBSD port", freebsd.org; "ports/comms/fldigi/", OpenBSD; "pkgsrc/ham/fldigi/", NetBSD; "Infrastructure/Fedorahosted-retirement - Fedora Project Wiki", fedorahosted.org (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "W1HKJ Software", www.w1hkj.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: FLAMP Amateur Multicast Protocol 3.0 w1hkj.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: Freese, "Reed-Solomon Identification", w1hkj.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "Infrastructure/Fedorahosted-retirement - Fedora Project Wiki", fedorahosted.org (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: Schmidt, "A Proposal For An ARQ Protocol For Use With MT63 And Similar Modes", W1HKJ, December 2004 (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: Dave Freese, "flarqhelp main", www.w1hkj.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: "FLMSG Users Manual: FLMSG Users Manual - Version 4.0", www.w1hkj.com (original not read by us) en.wikipedia.org
- Wikipedia, "Fldigi" (CC BY-SA 4.0), which cites: Russon, "Anonymous' Airchat Aims to Allow Communication Without Needing Phone or Internet Access", ibtimes.co.uk, 24 April 2014; "Anonymous' radio-based networking keeps protesters off the grid", engadget.com, 25 April 2014; "AirChat: Secure Wireless from Anonymous", 14 May 2014 (we also read that source) en.wikipedia.org
Each numbered sentence above was checked against the source it cites before publication. Sentences citing Wikipedia adapt text from the English Wikipedia article Fldigi (contributors), used under CC BY-SA 4.0; this entry is available under the same licence. Other sources were used for facts only; no text or images are copied from them.
More in Radio Modulation Modes
Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Fldigi (CC BY-SA 4.0).
- Word definitions: the Codexery glossary, each quoted from its Wikipedia article.
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