Nice summary. Thanks Ray! C
On 2011-04-18, at 13:16, Ray Forma wrote: > > James, > > from what I can find from very limited information it seems that current > planning is to transmit two different forms of digital radio to different > parts of Australia. > > DAB+ radio will service areas of high population density, being the capital > cities. All of Perth's DAB+ broadcasters use only two frequencies, Frequency > block 9B on 204.64MHz, and 9C on 206.352MHz. Two 50kW transmitters transmit > these channels from the NEW10 transmission tower in Carmel on the Darling > Range. Frequency block 9A on 202.928MHz is probably being held in reserve if > we go well beyond the present 30+ stations. These higher frequencies do not > travel well over long distances. > > Areas with less dense populations have DRM, meaning Digital Radio Mondiale, > not Digital Rights Management. (mondiale is Italian and French for > "worldwide") DRM is a set of digital audio broadcasting technologies designed > to work over the bands currently used for AM broadcasting. Use of various > MPEG-4 codecs allows DRM can carry more channels at higher quality, into a > given amount of bandwidth than can conventional AM. Because Medium-wave AM > frequencies are low enough to have significantly longer reach than the higher > frequencies of DAB+, they can cover much bigger geographical areas. The > principle of DRM is that bandwidth is the limited element, and computer > processing power is cheap; modern CPU-intensive audio compression techniques > enable more efficient use of available bandwidth, at the smallish expense of > processing resources. > > DRM can deliver FM-comparable sound quality, but on frequencies below 30 MHz > (long wave, medium wave and short wave), which allow for very-long-distance > signal propagation. DRM has been designed especially to use portions of older > AM transmitter facilities such as antennas, avoiding major new investment. > DRM is robust against the fading and interference which often plague > conventional broadcasting on these frequency ranges. Digital Signal > Processors perform the encoding and decoding, so a cheap embedded computer > with a conventional transmitter and receiver can perform the rather complex > encoding and decoding. > > Until now DRM receivers have typically used a personal computer. A few > manufacturers are presently selling stand alone DRM receivers (Himalaya > Electronics, Technisat, Morphy Richards, Starwaves, UniWave, Sarapulsky > Radiozavod), which are mostly based upon the no longer available Radioscape > RS500 module. The UniWave set is based upon the NewStar Electronics WR608 > module. New modules are expected from NewStar Electronics (WR998), from > Analog Devices, and others. Kenwood and Fraunhofer presented a prototype > standalone receiver chip in September 2006. > > Digital Radio Mondiale is being considered by Ofcom for introduction in > Britain in 2012 on the present AM medium wave band. > > On 28 September 2006, the Australian Communications and Media Authority > announced that it had "placed an embargo on frequency bands potentially > suitable for use by broadcasting services using Digital Radio Mondiale until > spectrum planning can be completed" "those bands being 5950–6200, 7100–7300, > 9500–9900, 11650–12050, 13600–13800, 15100–15600, 17550–17900, 21450–21850 > and 25670–26100 kHz. Note that the higher frequencies listed are capable of > worldwide transmission. > > So, if you live outside the capital cities don't invest in DAB+ until ACMA's > plans are clearer. > > The following lists the 34 DAB+ stations currently broadcasting in Perth: > > 9C National Multiplex > > Station Name, Format > > ABC Local Radio Talk, News, Music and more. > > ABC Radio National National talk and arts radio > > ABC Classic FM Classical Music > > ABC NewsRadio News and Parliamentary Broadcasts > > Triple J Youth focused music station > > ABC Dig Music Adult Contemporary Music > > ABC Country Country Music > > ABC Jazz Jazz Music > > ABC Grandstand Live Sports Coverage > > ABC Extra Special Event Radio > > SBS Radio 1 Multilingual Radio > > SBS Radio 2 Multilingual Radio SBS AM Service > > SBS Chill World Chillout Music > > SBS Pop Asia Asian Pop Music > > SBS Radio 6 BBC World Simulcast. Some opt outs, including sports coverage & > special events. > > > > 9B Perth Multiplex > > Station Name, Format > > 6PR Talk > > 96fm Mainstream rock > > The Buckle Country music > > 6IX Classic hits > > My Perth Digital Hot adult contemporary > > Hot Country Country music > > Nova 93.7 Top 40 (CHR) > > NovaNation Dance music > > 92.9 Top 40 (CHR) > > Mix 94.5 Modern adult contemporary > > Barry Comedy > > The Main Stage Touring artists music > > Radar Radio Indie music > > RTRFM Public Radio and Music & Arts Community > > Community Curtin FM University Community Radio (Music, Talk, News) > > Capital 101.7FM Seniors community > > 98.5 Sonshine FM Christian Community Radio > > Noongar Radio 100.9 Talk, music > > Heritage FM Music and information > > I have plagiarised much of the above from various sources. > > On 18/04/2011, at 9:10 AM, James / Hans Kunz wrote: > >> there are no digital radios as a stick available & on top of all digital >> radio in wa is limited to the perth metro & in future to some regional >> areas, i'm not sure if mandurah can receive d-radio, all d-radio stations >> are on the net too, >> preferences re receiver......i have a $250.- in the workshop (sangean) & at >> home there are 2 $70.- models in use >> there are more expensive models with ipod/iphone socket available >> there was once a lenghty talk about d-radio on 6pr during a night show, some >> listener had to return their radio because of no reception in their area, >> try to borrow a unit & verify the reception!!!! >> right now there are approx 33 station on d-radio available >> James >> >> SAD Technic >> U3 6 Chalkley Pl >> Bayswater WA >> Australia >> +618 9370 5307 >> mob 0414 421132 (international +614 14421132) >> [email protected] >> http://www.members.iinet.net.au/~saddas/ >> >> Patience and perseverance have a magical effect before which difficulties >> disappear and obstacles vanish. > > Regards, > > Ray Forma > Mob +61 (0) 428 596938 > > > > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Unsubscribe - <mailto:[email protected]> > -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Unsubscribe - <mailto:[email protected]>
