gMFSK

If you're looking for a versatile HF terminal program for your Linux or other UNIX-like operating system, you might want to check out gMFSK. Despite what the name might suggest, gMFSK is actually capable of sending and receiving a wide range of digital conversational modes commonly used by radio amateurs on HF.

Some of the popular digital modes that gMFSK supports include MFSK (MFSK16 and MFSK8), RTTY, THROB (1, 2, and 4 throbs/sec), PSK31 (BPSK and QPSK), PSK63, MT63, and Feldhell. That's not all, though. Here are some other key features of gMFSK that might be of interest:

- Point-and-click tuning of decoded signal
- Automatic data transfer from received text to the log window with a simple right click
- Multimode waterfall display (with options for waterfall, spectrum, and scope)
- Remote logging capability using SysV IPC (current supported by Xlog)
- PTT control using serial port control lines or parallel port data lines
- Rig control using hamlib, which can be used to show real frequencies in waterfall or to control PTT
- Fixtext macros that allow you to include variables and output from any UNIX command

One major advantage of gMFSK is that it uses your computer's soundcard to interface with an SSB capable transceiver. All digital signal processing is handled by your main CPU, so any soundcard supported by your operating system should work.

Keep in mind that gMFSK is built on Gnome libraries, but you don't need to run the Gnome desktop in order to use it. Most modern Linux distributions already include Gnome libraries, even if you prefer a different desktop environment. You'll also need to make sure you have the FFTW 2.x libraries installed to run gMFSK. Rig control requires hamlib.

Overall, gMFSK is a well-rounded and reliable option for those who want a multimode HF terminal program that can work with a variety of different digital modes. It's easy to use and has plenty of features that make it a great choice for amateur radio enthusiasts.