There was a bit of a learning curve before I could really appreciate most of the HAM radio applications in Ubuntu Linux. Then I discovered fldigi, a digiatl communications program for anyone. Let me explain the basics.

Fldigi can be for HAM operators or people looking to learn more about digital communications. Before I had my HAM Licence this program was still usable in the same room or over my old walkie-talkies. It sends out audible signals from your sound device, I started just playing the sounds from my speakers and eventually invested in interconnecting cables to other computers and radio transmitters. Simple headphone jacks worked amazingly, and the software/hardware combination is able to work with modular equipment. This includes a USB Tube Sound card for those looking to send and listen for the perfect signal.

Unfortunately this program does not act as a radio, use your existing hardware as a radio device, or come with instructions for non-radio users. In fact the first time I used this program I was frustrated by the constant inquiry into what my callsign was. But the open-source nature of the program can allow for a spinoff without all of the questions.

It is built to integrate with radios that can connect to your computer. This can help you to more effectively use the visual waterfall without swapping back and forth between your computer and your radio. Although I've typically used the program with much less sophisticated radios the effort by the developers is commendable.

On the plus side it does not force the regulatory requirements of one country that many proprietary programs do, usually rulse from the United States of America that tend to be overkill and are not required in Canada. The idea is to make the use of digital modes a fun experience, even for new operators.

CW (Continuous Wave Morse) Code is simulated by the soundcard, and the reader portion of the application can easily capture and convert the information for new CW users. The WPM (words per minute) can be adjusted far beyond human capabilities, which is fine for short range communication with less interference. The default is between 16 to 18 WPM though, and unless you have a keen ear for the speed of another operator its better to stay there. Some experienced CW operators have complained that my send speed is a little slow, but it almost always gets a clear read.

PSK Modes, including PSK31, 63, 125, and QPSK250 are supported. The usefulness of these modulations is in error correction and long file transfer. It also uses less bandwidth, but still a bit more than CW.

If you're looking for a better experience with digital modes, truly free software (no money, fully liberated), and a utility that even works with older radios from the mid to late twentieth century check out this application. I'd love to run a quick overview and video demonstration about it sometime, but it's probably better that I stick to writing.

Get fldigi in the Ubuntu repositories.