Radiofax is a way to transmit images in gray scale upon the radio. The most common use is the transmission of weather charts on the shortwaves.
Radiofax software
The programme I use for decoding Radiofax transmissions is SeaTTY, a software that decodes the audio signal coming from the line-out of my receiver to the mic-in of my laptop.
Weather radiofax frequencies
There are several radio stations in the world transmitting weather information though radio fax. A complete list of weather stations is made available by the National Oceanic and Atmospheric Administration of the U.S. Department of Commerce. The weather radio stations I was able to receive from Finland are summarised in the following table.
| Callsign | Country | Frequency | Emission | RPM/IOC | Time |
|---|---|---|---|---|---|
| GYA | United Kingdom | 4610 kHz 8040 kHz | F3C | 120/576 | 00.00 – 24.00 UTC |
| DDH3 | Germany | 3855 kHz | F3C | 120/576 | 00.00 – 24.00 UTC |
| DDK3 | Germany | 7880 kHz | F3C | 120/576 | 00.00 – 24.00 UTC |
Radiofax resources on the net: