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FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDERFREEDV QSO FINDERHF DIGITAL SOFTWAREHF DIGITALVOICE
Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDERFREEDV QSO FINDERHF DIGITAL SOFTWAREHF DIGITALVOICE
Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDERFREEDV QSO FINDERHF DIGITAL SOFTWAREHF DIGITALVOICE
Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDERFREEDV QSO FINDERHF DIGITAL SOFTWAREHF DIGITALVOICE
Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
FREEDV HF QSO FINDER Frequency Selector Your Frequency Update Clear. Presets. Users LoggedIn
Skip to content
FREEDV: OPEN SOURCE AMATEUR DIGITAL VOICE Where Amateur Radio Is Driving The State of the Art Scroll down to contentINTRODUCTION
FreeDV is a Digital Voice mode for HF radio. You can run FreeDV using a free GUI application for Windows, Linux and OSX that allows any SSB radio to be used for low bit rate digital voice. There are several reports of the new FreeDV 700D mode outperforming SSB at low SNRs. At high SNRs FreeDV 1600 sounds like FM, with no annoying analog HFradio noise.
Alternatively you can buy a SM1000 FreeDV adaptor that allows you to run FreeDV (1600 and 700D modes) on any HF radio without a PC or sound card. If you are a hardware or software developer, you can integrate FreeDV into your project using the LGPL licensed FreeDV API.
Speech is compressed down to 700-1600 bit/s then modulated onto a 1.25 kHz wide signal comprised of 16 QPSK carriers which is sent to the Mic input of a SSB radio. The signal is received by an SSB radio, then demodulated and decoded by FreeDV. FreeDV was built by an international team of radio amateurs working together on coding, design, user interface and testing. FreeDV is open source software, released under the GNU Lesser Public License version 2.1. The modems and Codec 2 speech codec used in FreeDV are also opensource.
NEWS
July 2019
Ver 2 SM1000 firmware – includes FreeDV 700D. Read More …May 2018
Ver 1.3 FreeDV GUI program – New 700D mode that outperforms SSB at low SNRs. Read More …July 2017
Ver 1.2.2 FreeDV GUI program – improved Hamlib support, removed unused features and simplified dialogs, up to date OSX support, moredocumentation
February 16 2017
Ver 1.2 of FreeDV GUI program with 700C – speech quality close to FreeDV 1600 with greatly improved low SNR performanceOctober 18 2015
Ver 1.10 of FreeDV Quick Start Guide QSG releasedSeptember 25 2015
Ver 1.1 of FreeDV GUI program with voice keyerAugust 25 2015
Ver 1.0.0 “700B” mode added that improves speech quality over 700 mode but still performs well at low SNRsWHY FREEDV?
FreeDV 700D outperforms SSB at low SNRs – you can get an easy copy of 700D when SSB is unusable. Amateur Radio is transitioning from analog to digital, much as it transitioned from AM to SSB in the 1950’s and 1960’s. How would you feel if one or two companies owned the patents for SSB, then forced you to use their technology, made it illegal to experiment with or even understand the technology, and insisted you stay locked to it for the next 100 years? That’s exactly what _was_ happening with digital voice. But now, hams are in control of their technology again! FreeDV is unique as it uses 100% Open Source Software, _including_ the speech codec. No secrets, nothing proprietary! FreeDV represents a path for 21st century Amateur Radio where Hams are free to experiment and innovate, rather than a future locked into a single manufacturersclosed technology.
DEMO VIDEO
Watch this video of aFreeDV QSO.
HERE IS WHAT YOU NEED: * A SSB receiver or transceiver * FreeDV software, download links are below. * A Windows, Linux or OSX PC with one (receive only) or two soundcards.
* Cables to connect your PC to your SSB radio.OR:
* A SM1000 Digital Voice Adaptor * Cables to connect the SM1000 to your SSB radio CONNECTING YOUR RADIO Those who don’t have a special connection for digital modes can use the normal audio inputs and outputs of your radio. The same cables and hardware that you use for other digital modes that are based on PC programs will work with FreeDV, but you will need a second sound interface for the microphone and speaker connections to the FreeDV program. A USB headset of the sort used by gamers is all you need for the second sound interface. CONFIGURING YOUR RADIO Turn off as much processing as possible. In general noise blankers, DSP band limit filtering and narrow bandpass filters are more likely to hurt than help, while compression, DSP noise or carrier elimination, and voice processing are _definitely_ wrong for digital modes. FreeDV’s HF modem does its own DSP, and in general this is true for other digital programs as well. You can see the received effect of different settings in the S/N (signal to noise ratio) display of FreeDV. A higher S/N is better. Drive your transmitter to an average power of about 20% of its PEP power. There is a 8-12 dB peak-to-average power ratio in our HF modem. Over-driving will reduce the received S/N. More is not better for DV!DOWNLOAD
* FreeDV 1.3.1 Windows 32-bit Installer * FreeDV 1.3.1 Windows 64-bit Installer * Now in the main Fedora and Fedora EPEL 6 & 7 repositories! * FreeDV 1.3.1 Mac OSX Disk Image * Now in the Debian Unstablerepositories!
SOURCE CODE
* FreeDV Source Code Archive * Codec2 Source Code Archive * Browse FreeDV Source Code (Stable Releases) * Browse FreeDV Source CodeDOCUMENTATION
Several guides are available* User Manual
–
How to get started, notes on advanced and new features in the latestversions of FreeDV.
* SM1000 Manual
– How to set up and use the SM1000. * FreeDV Quick Start Guide * Hardware Howto – SM1000 cabling options for various rigs * Building and Running FreeDV on Raspberry Pi by Matt Roberts, KK5JYWHO CAN I TALK TO?
Login to the K7VE FreeDV QSO Finder to find other Hams using FreeDV.Australia VK3
7.177MHz
Anytime
FreeDV beacon
Australia VK3
14.150/14.153 MHz
Every day at 3 and 4pm AETCasual QSOs
Netherlands
3.720 MHz in USB
Every Sunday 10:00 UTCNet
UK
3.643MHz LSB
Sundays mornings at 09:00 Local RSGB broadcast by Matt G6WPJUK
3.697 MHz LSB 700C
1600 Local
Casual QSOs
USA
14.236 MHz USB
Anytime
Casual QSOs
SUPPORT
Please post your questions to the Digital VoiceGoogle group
Developers please subscribe to the Codec 2 Mailing List.
IRC CHAT
For CASUAL CHAT there is a #freedv IRC channel on freenode.net DESIGN & KEY FEATURESDESIGN:
* Codec 2 voice codec and FDMDV/COHPSK modems * 1.25 kHz spectrum bandwidth (half SSB) with 75 Hz carrier spacing * FreeDV 1600 mode: 1275 bit/s voice coding, 25 bit/s text for call sign ID, 300 bit/s FEC, 16×50 baud DQPSK carriers, Differential QPSKdemodulation
* FreeDV 700(C) mode: 700 bit/s voice coding, no FEC, 14×75 baud QPSK carriers, frequency diversity to combat fading, coherent QPSKdemodulation
* No interleaving in time, resulting in low latency, fast synchronization and quick recovery from fades. * 44.1 or 48kHz sample rate sound card compatibleKEY FEATURES:
* Cross platform, runs on Linux and Windows. * Open source, patent free Codec and Modem that anyone can experiment with and modify * Waterfall, spectrum, scatter and audio oscilloscope displays. * Adjustable squelch * Fast/slow SNR estimation * Microphone and Speaker signal audio Equaliser * Control of Transmitter PTT via RS232 levels * Works with one (receive only) or two (transmit and receive) sound cards, for example a built in sound card and USB headphones.CREDITS
FreeDV is being maintained and extended by David Rowe, VK5DGR. Richard Shaw KF5OIM maintains the Cmake build system, Windows and Fedora packaging. Walter, K5WH is leading Windows testing in the USA. Debian packaging thanks to A. Maitland Bottoms (AA4HS) and the Debian Hamradio Maintainers. David Tiller, K4DET, is kindly building OSX images for the project. As development continues, many people are helping whom we have not credited on this web site, but we appreciate all of their work.HISTORY
In 2012 FreeDV was coded from scratch by David Witten (GUI, architecture) and David Rowe (Codec 2, modem implementation,integration).
The FreeDV design and user interface is based on FDMDV, which was developed by Francesco Lanza, HB9TLK. Francesco received advice on modem design from Peter Martinez G3PLX, who has also advised David on the FDMDV modem used in FreeDV. Mel Whitten, K0PFX has contributed greatly to the design, testing and promotion of several Digital Voice systems, including FDMDV. This practical experience has led to the current design – a fast sync, no FEC, low latency system that gives a “SSB” type feel for operators. Mel and a team of alpha testers (Gerry, N4DVR; Jim, K3DCC; Rick, WA6NUT; Tony, K2MO) provided feedback on usability and design ofFreeDV.
Bruce Perens has been a thought leader on open source, patent free voice codecs for Amateur Radio. He has inspired, promoted and encouraged the development of Codec 2 and FreeDV.LINKS
* Google DigitalVoice group * FDMDV Digital Voice Resource Page * Codec 2 Voice Codec* FDMDV Modem
* Why Open Source Digital Voice Is Important * FreeDV Specification * Notes for users of Tigertronics rig interfaces * K7VE’s FreeDV QSO Finder * David Rowe interviewed about CODEC2 * HamRadioNow.tv Episode 81 Bruce Parens and Mel Whitten interview at Dayton Hamvention 2013FAQ
* Is there any way to save the screen settings when you drag the tabs to multiple windows on the main screen? No, as we can’t work out how to support saving and restoring this information with wxWidgets. * The Tools – Record/Play file feature doesn’t work with my wavefile!
Currently the “Play File – Mic In” feature only supports 8 kHz sample rate, 16 bit integer samples. Try converting your wave file tothat format.
* Hamlib PTT support doesn’t work with my radio! It works fine with Fldigi, and other programs. This is always a mismatch between the serial parameters Hamlib is using with FreeDV and your radio. For example you may have changed the default serial rate on your radio. Carefully check the serial parameters on your radio match those used by FreeDV in the PTT Dialog. ADDING FREEDV TO YOUR HARDWARE PRODUCT OR SOFTWARE PROJECT If you are a hardware or software developer, you can integrate FreeDV into your project using the LGPL licensed FreeDV API.
No license fees are required to use FreeDV. Including it in your project is a simple as compiling a library of C code. FreeDV does not require an operating system, it runs happily “bare metal” on small machines such as micro-controllers. It does require a hardware Floating Point Unit (FPU). The FreeDV stack is gcc compilable C software that runs in about 1% of the CPU resources on a modern PC. FreeDV 1600 has even been ported to a “bare metal” STM32F4 micro-controller (168MHz, FPU, 128k RAM,500k flash).
FreeDV requires a floating point processor. While it might be possible to create a fixed-point implementation, there is little incentive to do so since floating point processors capable of running FreeDV are now available under $5.DONATE
How much have you spent on Ham radio gear this year? How did it compare to FreeDV? FreeDV represents an open and free future for digital voice over Ham Radio. You can help by donating via PayPalor Patreon
.
The FreeDV developers have donated 1000’s of hours of highly skilled engineering time. Your donation will reduce the out of pocket costs of the developers for hardware, travel, and FreeDV promotion at Hamevents.
Buying a SM1000 FreeDV adaptor allows you to run FreeDV on any HF radio without a PC or sound card. This supports David Rowe , the primary developer ofFreeDV and Codec 2
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