Some of you may be disappointed to hear this, but it’s the state of DAB radio, it’ll be a long post so bear with it.
I was talking with the head engineer for DAB+ earlier in the week, not the repair tech, the actual guy who designs the DAB+ network for CRA.
To start off, the Como site in Southern Sydney has issues with the antennas, the receive doesn’t have enough protection from the transmit, due to a new antenna manufacturer & design, so there’s a circular issue with the On Channel system. The antennas that were removed from the Redfern site will be installed here in late March, & this should rectify the issue & it’ll be on air after that. Some of the other gear that was removed from the Redfern site will be going to the Arthurs Seat site in Vic, but I don’t know when that’s planned?
He also said that DAB+ is a sloppy standard, nowhere near as refined as DVB-T, & that CRA deemed audio glitches/dropouts as a result were acceptable (where it wouldn’t be in TV). He was discussing the fact that unlike DVB-T, there’s no locked timing between transmitters i.e there’s no GPS, 1PPM, or 10MHz locked timing, so when they turn on a On Chanel Translator, there could be a delay between the TX’s of anywhere from 0 micro seconds to 6 seconds, which is acceptable under the standards, but you don’t know & can’t predict or control this delay, so if your annoyed at the dropouts of audio when driving around, this is most likely cause (if you otherwise have a good signal), as you’ll be getting data conflicts between transmitter sites from the signal delay in the SFN.
Another thing is, that DAB+ won’t likely be rolled out to regional areas anytime soon or fast, as CRA tried to make the Nationals (ABC & SBS) join their Multiplex & essentially fund the DAB+ transmitters regionally for the commercials, but the Nationals said FU, we’re going to use channel 9C everywhere & run a full suite of channels like they do in the Metro areas, so the commercials have to go it alone & fund their own TX’s, which they don’t have the money to do. It’s also partially the reason the ABC & SBS put their digital radio channels on their DTV services, so they got the jump on the commercial digital offerings for essentially no money.
Partially related to this, back at the start of DAB+ the Nationals were going to get higher TX powers, like they do with AM/FM to cover a greater area with digital radio, but CRA found out what their plans were & complained, so it was put in legislation that all services National, Commercial & Community would have the same TX power & coverage areas, so CRA crippled the ABC/SBS Digital radio coverage plans at the start.
I also said to him DAB+ shouldn’t have been used in Australia, we should be using DRM/DRM+ especially regionally, & he agreed 100%, but said, don’t mention that anywhere near CRA you’ll be shot, DRM is a dirty word around them. He said the ABC & ACMA want to use DRM, but CRA keep insisting on pushing DAB+.
He also said the Nationals outsmarted CRA again with the Mandurah DAB+ service, because they use it as a booster translator service into the South side of Perth where some places have poor reception, but the commercials can’t do that, being different metro & regional. He didn’t say but I’m reading between the lines that some of the issues with the Gold Coast DAB+ services hold up, are related to similar?