Internet Relay Morse Code
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irmc - Internet Relay Morse Code

IRMC stands for Internet Relay Morse Code and is an implementation of MOIP.

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:

./irmc -h

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.