– All digi action is in audio pass band 300 and 2800 Hz. Configure Computer + external sound card. Sound card connects to, and RF isolates, radio and computer. IMPORTANT: Set your transmitter power level to no more than 90–95% of maximum PEP! Multiple sound cards. In systems with multiple sound cards they will not always be in the correct sort order on boot. This may cause problems not only with fldigi, but other apps that depend on a certain sound card. The work around is not that difficult and will reliably place the preferred sound card in the correct slot.
- Sound card interfacing
PC sound card interfacing for RTTY SSTV PSK31, collection of interface connections to choose from when having a desire to use the Soundboard
- Icom Yaesu and Kenwood CAT interfaces
Here you can find a a selections of CAT interfaces for ICOM Yaesu Kenwood.
- PSK-31 Interface for the FT-817
Build a PSK-31 PC interface for the yaesu FT-817
- Rtty interface (FSK/AFSK) with sound cards
'How to remove the so called 'ground loop' and the reentry in the RTTY broadcast and make radio and PC happily coexist'
- Yaesu FT857 897 Interface
FT857 and FT897 Interface PCB and schematic
- FT-1000MP interface
YAESU FT-1000/MP/MARK V (filed) interface, this one of numerous RTX sound blaster interfaces you can find on the internet, but this one include:FSK KEYING to use with the RTTY port, DVS-2 to use the interface in AFSK mode, this include all digital modes + voice keyer, CW KEYING
- Remote interface for Kenwood transceivers
Cat interface for Kenwood transceivers, tested with TS-850 and kenwood TS-50 but should work with all Kenwood rtx
- CAT & audio interface
Schematics and plans to build a custom CAT and audio pc interface
- FT-897 Cat interface
HamRadioHomebrew Cat Interface for Yaesu FT-897 by PE1OPM
- SoundCard Packet TNC PC to Radio Interface
Computer sound card packet tnc to radio interface. david stansbury kb3kai home-brew version of this soundcard to rig adapter
- FT-817 AFSK Cable
Pc sound card interface for PSK31 MFSK Baudot for the yaesu FT-817
- FT8x7 OptoCAT
The safe RS232 CAT interface and PA buffer for Yaesu FT-817, FT-857, FT897 and FT-100 rigs
- PSK31 interface schematic for Yaesu RTX
Yaesu FT-1000MP, FT-990 and FT-920 packet data port to pc sound card for psk 31 interface.
- G4AXX Voice keyer Interface
This voice-keyer-interface connects between a Yaesu FT1000MP and a PC's sound card & COM port. It can be used as a voice-keyer with Contest Voice Blaster and as a voice-keyer and CW-keyer with Writelog.
- Sound Card Interface by VK6YSF
Presented here is a transceiver to computer sound card interface complete with automated transmit key function. A sound card interface is simply the audio coupling of a computer soundcard and a transceiver to allow various computer applications that send and receive SSTV, RTTY, PSK31 and other similar modes based on soundcard generated signals.
- Bluetooth CAT Interface for Yaesu FT 857 817 897
Schematics and purchasing information for the Yaesu FT - 8x7 DIY Bluetooth CAT micro miniature interface done by YO3GGX
- A Cable Construction Trick- If you have several TNC and radios this trick can be usefull for you
- A Switchbox for Soundcard Digital Modes- A homebrewed switchbox prooject Don Wilhelm W3FPR[ Hits: 1072 Votes: 0 Rating: 0 ]
- Amplifier keying buffer- Amplifier keying buffer for ICOM radios & others. Suitable for IC-746 IC-756 PRO and PROII. ACC1 key interface by KK5DR
- Apple MacBook interface for digital modes - How to make a custom Line In connector for apple macbook or iMac to connect your amatur radio transceiver. A simple modification of a standard USB audio interface can work.[ Hits: 97 Votes: 0 Rating: 0 ]
- APRSdroid to a Baofeng Cable - Cable for connecting APRSdroid to a Baofeng UV-82 Radio (APRS via RF)
- Bluetooth CAT Interface for Yaesu FT 857 817 897- Schematics and purchasing information for the Yaesu FT - 8x7 DIY Bluetooth CAT micro miniature interface done by YO3GGX[ Hits: 2632 Votes: 12 Rating: 2.58 ]
- Bluetooth Radio Interface- How to build a Bluetooth Radio Interface for Yaesu CAT standard or Icom CI-V system
- CAT & audio interface- Schematics and plans to build a custom CAT and audio pc interface[ Hits: 5423 Votes: 2 Rating: 5.5 ]
- CAT Interface project- CAT & audio interface version 3 by pa5ca
- Connect you MacOS to CAT Serial Port - How to connect an Apple MacOS to a USB Radio transceiver. Get a Mac driver for ICOM IC-7100, IC-7200, IC-7300, IC-7600, IC-7610, IC-7850, IC-9100, PCR2500, Kenwood TS-890S, TS-990S, TS-590S, Elecraft KX3, K3S, Yaesu FTdx3000, FT-891, FT-991 or Ten-Tec Eagle USB direct connect built in USB/Serial adapter.[ Hits: 119 Votes: 0 Rating: 0 ]
- DB37 FT-2000 Cable- Yaesu FT-2000 FT-2000D Cable connections
- DB37 FT-450 Cable- Schematic for Data, power, CAT, Key and Mic connection interface cable[ Hits: 1958 Votes: 1 Rating: 6 ]
- Digital VOX Sound Card Interface- This interface is intended to be used with all the popular digital modes like PSK31, RTTY, Olivia, etc., which modulate a continuous carrier.
- DIY Interface for SSTV PSK RTTY Android Apps- A homemade interface for any android device, allow to receive and trasmitt SSTV PSK RTTY from an android tablet based on the DD7LP original project include demo of a sample DIY kit.[ Hits: 219 Votes: 0 Rating: 0 ]
- Dual Radio Computer Interface- Schematic of a simple interface to connect a pc to a FT-1000 Mk5 Field and FT-817 transceivers.
- FT-1000MP interface- YAESU FT-1000/MP/MARK V (filed) interface, this one of numerous RTX sound blaster interfaces you can find on the internet, but this one include:FSK KEYING to use with the RTTY port, DVS-2 to use the interface in AFSK mode, this include all digital modes + voice keyer, CW KEYING[ Hits: 6685 Votes: 1 Rating: 10 ]
- FT-817 AFSK Cable- Pc sound card interface for PSK31 MFSK Baudot for the yaesu FT-817
- FT-897 Cat interface- HamRadioHomebrew Cat Interface for Yaesu FT-897 by PE1OPM[ Hits: 5090 Votes: 5 Rating: 4.6 ]
- FT1000MP to Sound Blaster- Yaesu FT 1000 MP to sound blaster card interface by Mark Marsden G4AXX
- FT8x7 OptoCAT- The safe RS232 CAT interface and PA buffer for Yaesu FT-817, FT-857, FT897 and FT-100 rigs[ Hits: 4224 Votes: 0 Rating: 0 ]
- G4AXX Voice keyer Interface- This voice-keyer-interface connects between a Yaesu FT1000MP and a PC's sound card & COM port. It can be used as a voice-keyer with Contest Voice Blaster and as a voice-keyer and CW-keyer with Writelog.
- Homebrew Digimode Interface- A full galvanic isolation interface for digital modes tested with FT-847[ Hits: 892 Votes: 0 Rating: 0 ]
- Homemade Yaesu interfaces- A collection of DIY interfaces for Yaesu transceivers, including CW, FSK, RTTY in german by DC9ZP
- IC-7600 How-to Conntect to PC- Using USB audio of the Icom IC-7600 to connect a computer with fldigi and flrig. IC-7600 settings, software settings and configuration tips.[ Hits: 403 Votes: 1 Rating: 1 ]
- IC706MKIIG Interface- Interfacing the IC706MKIIG for Soundcard & TNC modes
- Icom ACC1 interface- Need to interface both a TNC and the computer soundcard? This is a ICOM 756PRO ACC1 audio/keying/FSK interface by WA0SXV[ Hits: 1388 Votes: 2 Rating: 1 ]
- ICOM CI-V Interface schematic- G3VFP schematic for the ICOM CI-V interface with PTT and CW Keying
- ICOM IC-746 PRO Interface- If you want to interface the IC-746 Pro or any other Icom rig with a computer for rig control, an outboard CI-V CAT device is required.[ Hits: 1963 Votes: 2 Rating: 1 ]
- ICOM SoundBlaster Interface- Interfacing ICOM radios with PC soundcard by W8WWV
- ICOM Soundcard Interface- IC820H or other Icom Radios Soundcard interface for VHF EME use by DF9CY[ Hits: 1368 Votes: 0 Rating: 0 ]
- Icom Yaesu and Kenwood CAT interfaces- Here you can find a a selections of CAT interfaces for ICOM Yaesu Kenwood.
- Interface for MS_DSP- Minimal interface circuits for receiver and transmitter audio, also for PSK31[ Hits: 1516 Votes: 2 Rating: 5.5 ]
- Interface for TM255 and TM455- PTT and souncard interface for the kenwood TM255 and TM455
- Interfacing HAM radio- An article about interfacing amateur radio devices, usually transceivers to computers. It is a general article that cover common interface models using USB or RS232 for popular ham radio brands like Yaesu Icom and Kenwood[ Hits: 485 Votes: 1 Rating: 10 ]
- Interfacing to PC soundcards- General electronic topics on interfacing to PC soundcards by epanorama.net
- Isolated PTT and CW Key interface- Simple soundcard interface that can satisfy several requirements like totally isolated AF interface, Totally isolated PTT and CW Key interface, Extend Accessory connector to interface to allow easy connection of TNC and provide a solid PTT or SEND connection[ Hits: 85 Votes: 0 Rating: 0 ]
- K2 digital interface- WG4S Fat Wire Digital Interface for the Elecraft K2
- K2 OptoCAT- The safe RS232 CAT interface and PA buffer for Elecraft K2[ Hits: 947 Votes: 0 Rating: 0 ]
- Kenwood to pc serial ports- Simple, low cost interface between Kenwood serial ports and contest logging programs by Bob Wolbert, K6XX
- Kenwood-to-PC Serial Interface- A circuit that connects an IBM compatible personal computer, running TR Log or CT (etc.) contest logging software, and Kenwood transceivers equipped with serial control ports. CW keying is also provided in this RFI filtered interface unit.[ Hits: 2108 Votes: 3 Rating: 4 ]
- Multimode Interface- A multi-mode PC to radio interface for PSK, CW, Packet and more digital modes.
- Opto Interface for Digital Modes- N2UZ interface first designed to be used with Kenwood TS-570SG, but also used with Yaesu FT-1000M[ Hits: 1176 Votes: 0 Rating: 0 ]
- Optocoupled Transceiver-PC Audio Isolator project- An optocoupled audio interface between PC and Transceiver for digital modes. The article includes full schematic of complete board and build instructions.
- PC to Rig Interfacing Information- Connecting the computer to your RTX for using ham radio software programs[ Hits: 430 Votes: 0 Rating: 0 ]
- PC to RTX interface- Interface with galvanic isolated audio and digital paths. For ICOM IC-706, IC-718, IC-746 and IC-756 HF transceivers, the next one suits modern KENWOOD HF RIGs and the third is a simple 'PSK-31' interface.
- PG-4S to TH-F6 / TH-G71 Adapter- Wiring schema for TH-F6A or TH-F7EConvert a PG-4S to TH-F6 F7 / TH-G71 AdapterThose who already have a PG-4S may want to consider going this route, rather than buying two cables.[ Hits: 1750 Votes: 4 Rating: 7.75 ]
- PSK-31 Interface for the FT-817- Build a PSK-31 PC interface for the yaesu FT-817
- PSK31 interface- A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes.[ Hits: 795 Votes: 0 Rating: 0 ]
- PSK31 interface schematic for Yaesu RTX- Yaesu FT-1000MP, FT-990 and FT-920 packet data port to pc sound card for psk 31 interface.
- PTT and Sound Card Interface- PTT and soundcard interface schematic by ON6MU[ Hits: 1477 Votes: 2 Rating: 5.5 ]
- Radio Interfaces by W7IY- Article by W7IY on commercial pc to radio interfaces with products comparison and personal comments.
- Remote interface for Kenwood transceivers- Cat interface for Kenwood transceivers, tested with TS-850 and kenwood TS-50 but should work with all Kenwood rtx[ Hits: 6243 Votes: 4 Rating: 6 ]
- Rig - Computer CW Interface- Make your own interface, two schematics for building an interface using the RTS line by N3UR
- Rig to Soundcard Interface by M0UKD- Practival project that contains two isolation transformers, one for AF from the tranciever to the line in on a soundcard, and one from the audio out of the soundcard back to the mic / data input of the radio. Both of which are variable inside the interface via two preset resistors.[ Hits: 715 Votes: 1 Rating: 2 ]
- Rtty interface (FSK/AFSK) with sound cards- 'How to remove the so called 'ground loop' and the reentry in the RTTY broadcast and make radio and PC happily coexist'
- RTTY PSK31 SSTV Sound Card Interfacing- Sound Card Interfacing for RTTY, PSK31, and SSTV[ Hits: 1135 Votes: 0 Rating: 0 ]
- RTTY/AFSK Interface for Android Phone or Tablet- Interface board was for connecting Yaesu FT-817ND transceiver to Android phone or tablet. The board was developed for experimenting with RTTY, SSTV and other digital modes using DroidRTTY, DroidSSTV and other software on an Android phone.
- Signalink Modification - Some modifications for the Tigertronics Signalink USB sound card radio interface[ Hits: 546 Votes: 5 Rating: 6.12 ]
- Signalink USB and Yaesu FT-857D- This webpage describe how to set up the Signalink USB interface and Yaesu FT-857D for digital operations by NA4IT
- Signalink USB Interface - Setup notes- Hints and Tips in using the Tigertronics SignalinkUSBExternal USB Sound Card and Interface[ Hits: 496 Votes: 3 Rating: 1.67 ]
- Signalink USB Mods- Modifications to the Tigertronics Signalink USB sound card
- Some Tips on Sound Card Interfacing to Your Rig- Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA[ Hits: 2081 Votes: 4 Rating: 6.5 ]
- Sound Card interface- Interface to insulate the radio circuits from the computer by VK2GWK
- Sound Card Interface by VK6YSF- Presented here is a transceiver to computer sound card interface complete with automated transmit key function. A sound card interface is simply the audio coupling of a computer soundcard and a transceiver to allow various computer applications that send and receive SSTV, RTTY, PSK31 and other similar modes based on soundcard generated signals.[ Hits: 2974 Votes: 2 Rating: 8.5 ]
- Sound Card Interface with Tone Keyer- An improved version of the audio interface commonly used to connect a computer soundcard to a transceiver's receive and transmit audio circuits
- Sound Card Interfacing- Homebrew your PC sound card to radio interface with this circuit obtained from the pages of Ernie Mills WM2U.[ Hits: 753 Votes: 0 Rating: 0 ]
- Sound card interfacing- PC sound card interfacing for RTTY SSTV PSK31, collection of interface connections to choose from when having a desire to use the Soundboard
- Sound Card Packet Interface- Setting up and testing a sound card packet radio interface by KD5ZUG[ Hits: 2179 Votes: 5 Rating: 7.8 ]
- Sound-Card Interface for the Yaesu FT-857D- A Simple Serial and Sound-Card Interface for the Yaesu FT-857D
- Soundcard Interfacing- The sudden explosion of new digital modes has taken the Amateur Radio world by storm. New modes such as PSK31 FT8 JT65 FSK441, ISCAT as well as established modes such as RTTY, SSTV, Hellschreiber and others have rocketed in popularity.In order to use these modes all that is required is a simple computer-to-radio interface which couples the computer soundcard to the radio[ Hits: 132 Votes: 0 Rating: 0 ]
- SoundCard Packet TNC PC to Radio Interface- Computer sound card packet tnc to radio interface. david stansbury kb3kai home-brew version of this soundcard to rig adapter
- The In's and Out's of a Sound Card- October 2003 QST article on working digital mondes with sound card interfaces[ Hits: 570 Votes: 1 Rating: 1 ]
- Transceiver to pc interface for echolink- with a hardware DTMF detector and galvanic isolationdesigned for SVXlink based Echolink gateway
- USB Sound card review- Using external usb sound card devices for amateur radio digital modes operations[ Hits: 439 Votes: 0 Rating: 0 ]
- USB to CAT (CI-V) adapter- Based on the FTDI's USB / serial IC FT-232BM. Tested with several Yaesu FT Serires models
- USB Warbler- This project describes how one USB port can provide all of the signals necessary to operate a transceiver in digital mode from a Windows XP laptop by KG4JJH[ Hits: 816 Votes: 0 Rating: 0 ]
- Using BlueCat Bluetooth Interface for Yaesu FT 8x7- With the bluecat interface it is possibile to connect a Yaesu FT 817 857 897 to a computer or a android smartphone without any cable or interface, using a bluetooth wireless connection
- Using the FT-857 mic Jack for CAT- Using the FT-857 Microphone Jack for Serial Control (CAT)[ Hits: 2627 Votes: 3 Rating: 8 ]
- VK2QW Sound Card Interfacing- Computer to transceiver sound card interfacing by VK2QW
- Yaesu FT-100 Data CAT connector- Yaesu FT-100 Data (CAT) MiniDIN 8-Pin Connector[ Hits: 1763 Votes: 2 Rating: 6 ]
- Yaesu FT857 897 Interface- FT857 and FT897 Interface PCB and schematic
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Recently introduced interfaces also incorporate their own sound card, and can therefore be powered and run from the PC via a single USB connection. The latter are much more expensive than the more simple interfaces like the 'Easy Digi' from K5INZ and usually perform much the same function. So these expensive interfaces are usually not needed.
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A few words about sound I/O on the PC. 'You are in a maze oftwisty little passages, all alike'.
PortAudio, PulseAudio and OSS are different ways in which fldigi can access your sound card through the various sound systems.
Digi Sound Cards & Media Devices Driver Download For Windows 7
OSS was the first audio backend in fldigi. It works with the Linux sound system of the same name, which has now been replaced by ALSA but is still supported via an emulation layer. Its only advantage, as an audio backend, is that it's simple and doesn't require any external libraries.
The PortAudio backend was written subsequently to support OSS on Linux and FreeBSD, ALSA and JACK on Linux, CoreAudio on OS X, and also the various sound APIs on Windows – all through the same PortAudio library.
PulseAudio is more than an audio hardware access layer; refer to its website for a summary of what it does. Fldigi supports it mainly because many Linux distributions are now integrating it with their desktops, but also because it has a few interesting features:
- it can take care of the resampling and volume control for us,
- it can stream audio over the network, and
- it makes it easier to run multiple fldigi instances (all accessing the same sound card).
- it provides mixer controls for input and output audio streams
- it remembers which hardware is used for each application it serves, and it remembers the mixer levels associated with that application
In the future it might be possible to replace all of these with a single backend, without any loss of functionality, performance, sound system or platform support. That'll be the day! Until then:
- Use PulseAudio if your Linux distro ships it, and you already have the pulseaudio daemon running (this is the case with Fedora 8/9 and Ubuntu 8.04, probably also with openSUSE 11.0). Or if you want networked audio, etc. etc.
- Otherwise, use PortAudio and select a device from the list(s). PortAudio is also the best way to access JACK, through which you can use other programs as audio sources/sinks – particularly useful with SDR software. As with PulseAudio, you can select different capture and playback audio devices.
- The OSS backend should be used only as a last resort. Note that it has not been updated to support user-configurable sample rates.
Use the PortAudio and select the device from the list(s).
Select the SndCrd tab on the configuration dialog.
On Linux Fldigi can interface to the sound card using either the OSS, the Portaudio, or the PulseAudio. Each of the appropriate libraries must be present on the computer to use that particular sound i/o.
On Windows Fldigi uses the Portaudio sound driver only.
It is also possible to configure Fldigi with File I/O only, which is useful for testing the application without an interface to the sound card. In the File I/O only configuration you can record and playback audio files in a number of different formats including the 'wav' format associated with the Windows operating system.
The program will find all active sound cards and the associated drivers for both. Select the sound card and driver type that will be used with the program. I recommend using the Pulseudio device driver if that is available on your Linux distribution.
If Pulse or Port audio is selected then you can either allow the program to use the auto detect to determine the best sound card sampling rate, or you can pick from the drop down list. If you know your RX and TX sound card oscillator correction factors you can enter them now. If not you can determine the RX rate correction using a special WWV modem built into Fldigi. The decoder and encoder logic for each of the various modems require a specific sound card sample rate which may not be the the actual sound card sample rate. The conversion between the modem sample rate and the sound card sample rate is accomplished by one of a set of sample rate converters.
Sound card oscillators may have a slight error in frequency that causes their sampling rate to not be the value specified. This error is usually small enough to be measured in a parts per million. Fldigi uses a technique called rate conversion to correct the sampled waveform for this error. The error can be measured and the correction factor determined by using the WWV calibration modem. The supporting library used for the converter provides several different levels of conversion, Best, Medium, Fastest and Linear Interpolator. The default, Medium interpolator, will be satisfactory for most sound cards. If you are running fldigi on a computer with limited cpu power you might find it necessary to select one of the more cpu efficient converters, either Fastest or Linear. Each gives progressively poorer performance but use fewer cpu cycles to perform the frequency conversion. You should also be sure that the cpu type is set to Slow cpu on the miscellaneous configuration tab.
Mixer controls are only active on Linux using OSS, ALSA backends and if the distribution provides application layer mixer support. Select whether you will be using Line-In or Mic-In for the audio connection from the receiver output. Fldigi ALWAYS expects to use the Line-Out for driving the transmitter audio. Set the PCM level for your sound card. If you check 'Manage mixer' then the Tx and Rx 'volume' controls on the main fldigi dialog will be active.
You may elect to make the right and left channels both contain the modem signal. Or, you may reverse the right and left channel audio signals. These two controls only change the function of the audio output.
- Sleeve: usually ground
- Ring: Right-hand channel for stereo signals, negative polarity for balanced mono signals. Fldigi uses this channel for special controls signals.
- Tip: Left-hand channel for stereo signals, positive polarity for balanced mono signals. Fldigi uses this channel for Rx and Tx audio.
The PTT, CW QSK and Pseudo-FSK items are found on their respective configuration tabs. They are replicated here for your convenience and these controls may be changed on this or the other tabs.
Digi Sound Cards Redeem
User selectable WAV file sample rate.
In systems with multiple sound cards they will not always be in the correct sort order on boot. This may cause problems not only with fldigi, but other apps that depend on a certain sound card. The work around is not that difficult and will reliably place the preferred sound card in the correct slot. Sound cards are numbered from 0 on to however many cards you have in your computer. Usually its only 2.
The 1st step is to determine the correct id of the cards in your system. Open a terminal and issue the following :: aplay -l
Here is an example of what you may see.
If it does not already exist you will need to create the following file:
You will have to root privileges to create the file, so a system such as Ubuntu that depends on sudo you would enter
$ sudo touch /etc/modprobe.d/alsa-options
Digi Sound Cards & Media Devices Driver Download For Windows 8.1
Using the above example, you edit that file so that it's contents contain
# Set preferred order of the sound cards
options snd-ICH6 index=0
options snd-AudioPCI index=1
The simplest terminal editor that is on just about every distribution is
'nano' so to edit the file you just created you can again use sudo
$ sudo nano /etc/modprobe.d/alsa-options
If you want to test this new file, reboot and open a terminal and again issue the command :: aplay -l
You will normally find that your internet browser and/or Flash want to use card 0, so you then may want to consider using card 1 for fldigi
Here is another example with 3 sound systems; mother board ALC1200, a thumb-drive audio codec, and a SignaLink USB:
The /etc/modprobe.d/alsa-options contains these lines
Notice that each line is uniquely related to the aplay -l report
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