To use the Icom ic-746(non-pro) with a computer and digital modes you need,as in the majority of transceivers to construct a sound card interface. This interface is very easy to build and uses an opto-coupler. The drawings are show below. Download drivers for Realtek USB Audio sound cards (Windows 10 x64), or install DriverPack Solution software for automatic driver download and update. Are you tired of looking for the drivers for your devices? Cheap Sound Cards, Buy Quality Computer & Office Directly from China Suppliers:PIFI Digi DAC+HIFI DAC Audio Sound Card Module I2S interface for Raspberry pi 3 2 Model B B+Digital Pinboard V2.0 Board SC08 Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return.
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.
Digital audio labs driver download for windows 10.
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 It works with the Linux sound system of the same name, which has now been replaced by ALSA but is still supported via an emulation layer.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:
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On Linux:
- 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.
On Windows:
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. Download emuzed* driver. 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.
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:
/etc/modprobe.d/alsa-options
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
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
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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
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$ 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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I decided to use the venerable Altoids tin for this project. They work great for this sort of thing. Plus the mints are delicious!
I decided to use 1/8' Stereo jacks for all I/O ports. I've done this before on a past project and it works well.
I marked the locations for the audio jacks by putting them in the bottom of the tin and marking the location with a Sharpie.
If you look close, you'll notice that the line is a bit higher than the jack, this is due to the pens thickness and ends up giving a perfect location for the jack with enough room to close the lid. I discovered this method after messing up and putting one just a bit too high.
I found the perfect method (courtesy of Don, K3RLL) for making holes in Altoids tins. A simple, basic, paper hole punch makes just the right sized hole and leaves a nice clean edge.
.jpg/220px-A_VIA_Envy_Sound_Card_5.1_6_Channels_(VIA_VT1617A).jpg "64-bit")
Test fitting the jacks in place to verify that the lid would close with the slip ring in place.
Now to connect the PCB to the jacks. I started by soldering the wires to the board with plenty of excess wire to reach the connectors. I then did a test fit to get the proper wire lengths and attached the jacks with the whole mess outside of the tin. I used heatshrink tube to clean up the clutter.
I used two layers of double-sided tape to hold the board into the tin to avoid any short circuits. I cleaned the inside of the tin with alcohol before sticking it down.
And the finished product! The flash made pictures difficult due to the shiny tin, but you can see the cable routing. This was a quick and easy project from getting to kit to having a completed and usable sound card interface!
| Rig | Left (To Rig) | Right (To PC) | PC |
| Spkr | RX Audio | RX Audio | Mic |
| Mic | TX Audio | TX Audio | Spkr |
| Mic | PTT | PTT | Serial |
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