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irmc - Internet Relay Morse Code

IRMC stands for Internet Relay Morse Code and is an implementation of MOIP. It implements the CWCom protocol as adopted by MorseKOB. You can try out the software in a browser using Java.

Screenshot on OSX

How to build?

Install dependency: morse keyer library

tar xzf v0.1.tar.gz
cd morse-0.1
./configure  --with-portaudio
sudo make install

Debian (Wheezy)

Some dependencies have to be installed:

apt-get install -y alsa-oss oss-compat build-essential autoconf libao-dev libtool

Afterwards compilation with make should work. If something went wrong, you may have to adjust your LD_LIBRARY_PATH. Alternatively try:

LD_LIBRARY_PATH=/usr/local/lib ./irmc 7890 33 123 

OSX (Yosemite)

Compilation with make :)

For the USB serial devices you need a PL2303 driver (i.e. PL2303_Serial-USB_on_OSX_Lion.pkg).


./irmc 7890 2348 test

Or you may want to use tcpdump, i.e.:

sudo tcpdump -i all -vvvv "host"

How to use:

The usage is: irmc [hostname] [port] [channel] [id] [serialport For example: `./irmc 7890 103 MyID /dev/tty.usbserial´

Hardware interface options

A good description on how to build different interfaces (telegraph key, sounder or both) is given on the MorseKOB Website. Landline telegraphs use "closed circuits" for communications; if you have built one at home, you may also use the loop interface.

Connection of a morse key: Serial PIN: 4 & 6 layout of pins Connecting the palm radio: keep an eye on the grounding :) RS232 DB9 Function
DTR 4 Manual Key / paddle common DSR 6 Manual key / dot paddle CTS 8 Dash paddle RTS 7 Sounder output SG 5 Sounder ground


  • v0.2 zip - ported to debian wheezy and osx yosemite, DG6FL
  • v0.1 zip - original version, VE7FEB

Code Quality

This is experimental code.