Quadrus SDR for DRM receiver in education

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AM and DRM broadcasts in the HF bands

Traditionally, AM modulation is used in the LW/MW/SW bands for broadcasting purposes. It is very easy to identify these the AM broadcast stations based on their Dual Side Band (DSB) shape in the spectrum. The spectrum and waterfall displays of the Quadrus SDR show such a modulation on the following pictures.

am spectr

am water

However, digital waveforms, i.e., DRM, have started to populate the HF bands, which can provide high quality content. The modulation format is optimized to the propagation behavior, and is based on the multi-carrier scheme. It is also very easy to recognize them in the band using the Quadrus SDR for DRM, because these stations have a distinct rectangular shape in the spectrum.

drm04

DRM in the telecommunication curriculum of universities

As DRM represents a significant part of broadcasting systems nowadays, most universities around the world have included this standard, or parts of it, into their curriculum on telecommunications. It is also an important part of the telecommunications program at the Budapest University of Technology and Economics as well, where we have recently introduced the Quadrus SDR for DRM by showcasing its DRM reception capability.

DSC_0478 DSC_0523

drm05 drm02

 

 

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One thought on “Quadrus SDR for DRM receiver in education”

  1. It”s quite unpleasant for me how difficult to catch an English language short wave broadcast station. In the age of sophisticated modulation modes i.e. DRM (Digital radio Mundial) you can find a lot of stations in the long established broadcast bands but unfortunately you can’t hear the Oxford style -formerly also named BBC English after the excellent pronuncation. BBC must have such a narrow budget that is not enough to find some money for a daylight transmisson frequency and antenna for Central and Eastern Europe.
    What a pity!
    I must have been listening to China Radio International instead, this afternoon.
    Otherwise there are a paradise of DX hunting of this kind in the short wave broadcast bands. It’s really exciting to find distant stations transmitting from exotic countries.
    You may find a lot of information at
    http://www.shortwavetime.com/ called the Short Wave Heaven and
    http://swldxbulgaria.blogspot.hu/ surprisingly called Bulgarian DX Blog which is really full of treasure, including maps and even information about solar activity.

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