| Ofcom considering DRM+ tests on 55 - 68 MHz26th January 2007 Ofcom has announced that it will consider applications to test DRM+ on the 55 - 68 MHz band following interest from London-based WRN after Ofcom had held a public consultation on this band which had attracted little interest. DRM+ is the extension to the DRM system, which was originally intended to be the digital radio replacement for LW, MW and SW at frequencies below 30 MHz. DRM+ will allow transmissions up to 120 MHz with wider channel bandwidths, which will allow higher bit rates and hence higher audio quality, and it is envisaged that it will primarily be used in the FM band. WRN has already trialled DRM on the 26 MHz band, but this band is not very well suited to carrying radio stations because it is subject to Sporadic E interference when there is significant sunspot acitivity, which allows radio signals to travel over long distances (such as from Europe) to interfere with local transmission due to the weird and wonderful propagation mechanisms that occur at lower frequencies.
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