And DRM moved into FM radio bands (88-110 Mhz) a few years ago, hence the collaboration between the two consortia. I wasn't aware that DAB+ does not operate in the FM band, higher bands only. I thought that overhere we would continue to use the FM band as with the earlier DAB transmissions.
The requirtrement is to move to digital, not sure if that would be a move to L-Band. L-Band is much narrower that that Bert, 2.6 is actually right in the middle of the S-Band (for the UHF folks here that's not your S(onder)-Band;-). The spectrum just above the traditional L-Band, 1700 Mhz+ just went up for auction to support mobile networks.
To clarify, the reduced coverage mentioned referred to the analog broadcasts, then exclusively by the Public Broadcasters. Some of that coverage went to enable the introduction to commercial radio. Following that upon the introduction of DAB, analog had a larger number of broadcaster outlets than available on digital radio.
Bert, what do you think of the DVB-T2 efforts to offer radio and narrow channel broadcasts? In the past I checked this out at IBC, but I never looked into it closer, so I can not judge its merits.
Donald Quoting "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>:
Donald Koeleman wrote:Currently broadcasters are being forced onto DAB+.This is what I expected from the start. As usual, these choices of broadcast system are political. Any pretense at technical reasons always sounds lame.I am aware of the codec update in DAB+, which brings it in line with DRM and HD Radio, however the frequency bands used for DAB+ continue to be bands in much higher demand than the analog AM and FM radio bands.DAB+ is designed for Band III, Band IV, and the L Band.Band III is the TV VHF band, available in the UK but not elsewhere. Other European countries do use VHF for TV.Band IV is the TV UHF band. So that's 470-614 MHz in the UK, expanded in the upper regions for non-TV use.The L Band is 1 to 2.6 GHz, much better used for cellular systems or satellite, actually. Although DAB+ does include a satellite mode, so I suppose that's what the L-Band is being retained for. But that's not why it was first introduced.So none of these options includes the lower frequencies, which work very well for one-way terrestrial broadcast digital radio, where channel widths can be much narrower than those used for TV or for wireless broadband, and where you want good propagation qualities.On the other hand, both HD Radio and DRM are specified for the traditional radio AM and FM bands. DRM also goes to shortwave.The government being forced into the release of frequencies and the public broadcasters having to reduce its coverage.Reduction of coverage is probably due in large part to the much higher frequencies being used, compared with FM (or AM). L Band would be particularly bad for this. Canada found this out and disbanded DAB entirely (CBC quit DAB in 2010). They're testing HD Radio instead, which quite honestly, is a darned good idea. Assuming broadcast radio needs to continue.Here is the good ole USA, when radio stations transmit HD Radio (which in this market they virtually all do), they still have to use hybrid mode. So their first digital channel is a simulcast of the analog channel, and then they typically offer one or two other channels in addition, all on the same frequency channel as the analog. But "cheating," by making low power use of the guard bands. In full digital mode, the power can be increased by at least 10X, and more than 10X in the AM band, compared to the very low power they are restricted to in hybrid mode.Come on Europe. Do the right thing. DRM or HD Radio. Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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