R-Pi and RTL-SDR = AFSK transmission between two Linux boxes

This video depicts the successful transmission of AFSK data via a radio link between two Linux machines using a R-Pi and an RTL-SDR dongle. The crew at Kprod posted this cool RTL-SDR project on their blog. They use minimodem to do the encoding in a FLAC or in a WAV format, then use the R-Pi […]

Cheap AFSK terminal node controller

Robots shared his cheap AFSK terminal node controller design. It’s a cheap alternative to the commercial TNCs, based on a STM32VL discovery board and a small adapter board. Audio Frequency Shift Keying is an old, low speed packed based radio standard, now primarily used in HAM radios for APRS communication. What is needed for APRS […]