EBU issues views to prevent PLT interference
22 December 2010

The EBU calls for suitable limits on PLT (Power-Line Transmission) devices to prevent interference with broadcast reception. The EBU's Technical Committee, its most senior technical body, has published an EBU Recommendation with specific guidance for the different broadcasting frequency bands: EBU R 119.

Dynamic or permanent notching

 

The new publication relates to the issues discussed in CENELEC's WG11, which is working on the development of PLT standards for Europe. The allowable solutions to prevent broadcasters suffering from PLT-caused radio interference differ per frequency band, as these are used differently.

 

 

Excerpt from EBU R 119 showing the bands concerned.

 

Dynamic notching consists in detecting the presence of broadcasting signals by PLT Modems and inserting a notch in the PLT transmitting spectrum at the frequencies where these broadcasting signals are identified.


For the HF broadcasting bands for example, dynamic notching can be used, as it would be beneficial to both broadcasters and PLT manufacturers. The same approach can also be used for the VHF Band I. For the VHF Bands II and III, which are heavily used by broadcasters,  the only solution is to exclude their use by PLT devices by permanently notching the PLT transmitting spectrum in the bands concerned. More details on these and other bands are given in the recommendation.

 

For more information on this topic, please don't hesitate to contact: Walid SAMI (EBU)

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