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Sendung vom 09.12.2010:

RADIA # 297 by Radio Helsinki - data radio, pt.4

johannes raggam for radio helsinki

data radio, pt.4 is an experiment to transmit encoded digital data over a civil FM radio network. the sounds received can be decoded using special, freely available software or - if available - hardware devices. with the process of encoding digital data, transmitting it over terrestrial radio networks and decoding at endpoints an simple alternative to the network called internet is created.

in fact, such guerrilla networks were successfully created by different parties in crisis/war situations. for example, the serbian radio b92 used CB radio transmission for exchanging information with isolated parts of former yugoslavia.

listeners of are encouraged to decode or record (for later decoding) the data or just listen to the stream of fax noise.

for decoding, follow these instructions:

* install the software to decode the encoded data and configure it according to the settings explained below.

* connect the line-out of your stereo with the line-in of your computer.
alternatively, but trickier, redirect an internet audio stream to the decoding software.

"data radio" - in german "datenradio" - started as a project for the "netart community convention 2009" in graz by johannes raggam in collaboration with christian pointner. for more information (in german) see [1][2].

Settings for HamFax on linux

carrier 800Hz
deviation 400Hz
modulation FM
filter middle
lpm 200
color mode

Software for decoding


windows (untested)

OSX (untested)