Simply listen to an FM broadcast station using RTL-SDR

Building on my previous post of listening to radio by re-streaming it as a compressed stream, here is a simpler way of encoding the audio straight to your computer’s speakers” You’ll need to install ‘RTL-SDR’ (as before) and also ‘sox’. From Ubuntu and similar linux distros, the command is: sudo apt-get install sox For Apple […]

Using RTL_FM and FFMPEG to stream radio audio over network

* UPDATED to reflect reader experiences * I’ve been playing with a great command-line software-defined radio command called RTL_FM (part of RTL-SDR) and used it with FFMPEG to create a 128Kbps MP3 stream of the radio signal I am receiving. On my Mac (OSX) I use MacPorts to install rtl-sdr and ffmpeg. On Linux your […]

Comparison of Analogue (NFM) and Digital (FDMA) Signals in PMR446 band

In the UK and other European Union countries, a set of radio channels have been allocated for use by the general public licence-free. Known as PMR446 (Public Mobile Radio on 446 MHz), a set of 8 analogue narrowband FM channels and 16 digital narrowband FDMA (Frequency Division Multiple Access) channels are available. Popular amongst hikers, […]

Radio Signals Are Beautiful: SDR and FM

As a radio ham I have recently become interested in a new branch of the hobby called Software Defined Radio (SDR). SDR is a radio system where the classic components of a radio receiver or transmitter has been replaced by a computer program, It’s only in recent times that domestic computers have become powerful enough […]