What is the regulatory position regarding DRM – can it co-exist with existing analogue transmissions in the same bands?
DRM30 has been adopted by the ITU as a suitable system for digital sound broadcasting under Recommendation ITU-R BS.1514 “System for Digital Sound Broadcasting in the broadcasting bands below 30MHz”. DRM+ is currently seeking adoption by the ITU into Recommendation ITU-R BS. 1114 “Systems for terrestrial digital sound broadcasting to vehicular, portable and fixed receivers in the frequency range 30-3 000 MHz”. DRM30 transmissions are thus permitted by Rec. BS.1514 and DRM+ transmissions can be authorised by individual administrations on the basis that they will not cause interference to exiting licensed services. Both DRM30 and DRM+ are standardised at ETSI as ES 201 980 “Digital Radio Mondiale (DRM); System specification”. The basis of most regulation of the use of spectrum is the limitation of interference. The re-use of a particular channel is authorised on the assumption that the transmitter power and antenna directivity characteristics of one service do not cause undue interferenc
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