What is the minimum sampling rate and bandwidth needed for an SDR to decode DAB radio?
DAB Radio SDR Decoding
DAB (and its successor DAB+) is the digital replacement for FM radio in Europe, Australia, and parts of Asia. It provides: multiple programs per frequency (6-18 programs in 1.537 MHz vs. one FM station in 200 kHz), consistent audio quality (no static or fading), data services (program information, album art, traffic updates), and efficient spectrum use.
- Performance verification: confirm specifications against the application requirements before finalizing the design
- Environmental factors: temperature range, humidity, and vibration affect long-term reliability and parameter drift
- Cost vs. performance: evaluate whether the application demands premium components or standard commercial grades
Frequently Asked Questions
What SDR works for DAB?
Any SDR covering Band III (174-240 MHz) with greater than 2 MHz bandwidth: RTL-SDR Blog V3/V4 ($30): works perfectly. The default 2.4 MSPS sampling rate covers the DAB bandwidth with margin. SDRplay RSP1A ($110): covers DAB with excellent dynamic range. Airspy HF+ Discovery ($170): excellent for DAB with its high dynamic range and oversampling. The RTL-SDR is the most cost-effective option for DAB reception.
What about DAB+ vs DAB?
DAB uses MPEG-1 Layer II (MP2) audio codec. Each audio service: 128-256 kbps. DAB+ uses HE-AAC v2 (AAC+SBR+PS) audio codec. Each audio service: 48-96 kbps (much more efficient). DAB+ provides: similar audio quality at 1/3 the bit rate, allowing 2-3× more programs per multiplex. Most new DAB deployments use DAB+ exclusively. The receiving SDR software (Welle.io, DABlin) decodes both DAB and DAB+ transparently.
Where is DAB available?
DAB/DAB+ broadcasts are available in: United Kingdom (the world's largest DAB market; extensive national and local coverage), Norway (first country to switch off FM in favor of DAB/DAB+), Denmark, Germany, Italy, Netherlands, Switzerland, Belgium, Australia, and parts of Asia (South Korea, Hong Kong). Not available in: the United States (the US uses HD Radio instead of DAB), Canada (limited trials, not deployed), Japan (uses ISDB-T for digital radio). Coverage maps: worlddab.org provides a global map of DAB deployments.