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AM HD de-authorized by FCC
- Thread starter nd2023
- Start date
R
rbrucecarter5
Guest
If only it wasn't a joke. The real April Fool's joke is the FCC and their incompetence and pre-disposition to irrelevancies like ownership rules.
I heard Ibiquity had improved the system a little...
The new system could broadcast uncompressed 600fps 128 bits/color/pixel 4320p 8K UHD video, contained entirely within the bandwidth Hams now use for PSK31 or QRSS CW.
It wouldn't produce interference or hazards - you could physically touch its antenna without getting an RF burn, and your radio would have no difficulty receiving weak co-channel DX
It's so robust that even if it was using 15.209 level signals, it'd be perfectly decoded via groundwave, with a crystal set without antenna/ground, at a distance where a 2-megawatt transmitter into a half-wave antenna would have even QRSS CW be undetectable at peak of skywave propagation, using a beverage antenna & military communications receiver, even with nothing else manmade on the air.
Assuming the above scenario is above ground in a low-noise area, it'd still work perfectly deep in the heart of Carlsbad Caverns inside a thick metal cage, with the receiver sitting on a plasma TV that's had its shielding covers removed
It could also work perfectly on the graveyard channels
Existing receivers would already be able to receive these signals
(would try to add more ridiculousness to this post, but i'm super tired, haven't slept a wink all night & it's 5:20am.)
BTW I *DO* think proper digital SHOULD work in weak signal environments, but not to the extremes above. If you can get a heterodyne on your radio in analog mode, though, digital on the same/equivalent setup should decode well enough to be able to be used for live play-by-play at sporting events; also spectral efficiency should be at least 12-16 kbits/s per kHz RF bandwidth.
The new system could broadcast uncompressed 600fps 128 bits/color/pixel 4320p 8K UHD video, contained entirely within the bandwidth Hams now use for PSK31 or QRSS CW.
It wouldn't produce interference or hazards - you could physically touch its antenna without getting an RF burn, and your radio would have no difficulty receiving weak co-channel DX
It's so robust that even if it was using 15.209 level signals, it'd be perfectly decoded via groundwave, with a crystal set without antenna/ground, at a distance where a 2-megawatt transmitter into a half-wave antenna would have even QRSS CW be undetectable at peak of skywave propagation, using a beverage antenna & military communications receiver, even with nothing else manmade on the air.
Assuming the above scenario is above ground in a low-noise area, it'd still work perfectly deep in the heart of Carlsbad Caverns inside a thick metal cage, with the receiver sitting on a plasma TV that's had its shielding covers removed
It could also work perfectly on the graveyard channels
Existing receivers would already be able to receive these signals
(would try to add more ridiculousness to this post, but i'm super tired, haven't slept a wink all night & it's 5:20am.)
BTW I *DO* think proper digital SHOULD work in weak signal environments, but not to the extremes above. If you can get a heterodyne on your radio in analog mode, though, digital on the same/equivalent setup should decode well enough to be able to be used for live play-by-play at sporting events; also spectral efficiency should be at least 12-16 kbits/s per kHz RF bandwidth.
F
FredLeonard
Guest
Before HD, once in a while I'd scan the dial to see what was on. Both on road trips and at home when I got bored with my usual pre-sets. Once in a while, I'd find something new or different I liked.
Thanks to HD, I don't scan AM any more more. IBOC hash destroys one of the best opportunities for people to discover a new format (especially since stations won't pay much for promotion any more either).
Thanks to HD, I don't scan AM any more more. IBOC hash destroys one of the best opportunities for people to discover a new format (especially since stations won't pay much for promotion any more either).
The AP just ran a story saying that upon hearing of
the plan to abolish AM-HD the new incoming Chairman
quickly vetoed it.
Instead he has implemented an immediate change to all digital
broadcasting so as to outdo the Brits.
Name of the new program will be Mandatory Adoption
(of) Digital....MAD for short.
Further details will appear in the Mandatory Adoption
(of) Digital magazine,available on most newsstands.
the plan to abolish AM-HD the new incoming Chairman
quickly vetoed it.
Instead he has implemented an immediate change to all digital
broadcasting so as to outdo the Brits.
Name of the new program will be Mandatory Adoption
(of) Digital....MAD for short.
Further details will appear in the Mandatory Adoption
(of) Digital magazine,available on most newsstands.
From Springfield, IL I can get KMOX 1120 HD signal in my car and it sounds great. I can sometimes get the black gospel station KATZ 1600 in HD and it sounds very good as well. When I took a trip last month to Saint Louis those 3 plus radio disney 1260 sounded very good in AM HD as well. All AM stations should go to AM HD only because it sounds so good and regular AM is terrible and unlistenable to me because of the static and bad fidelity.
Brian, I am very concerned. I think you need to get to an audiologist STAT, preferably with a police escort with sirens screaming (don't worry about damaging your hearing, which is obviously all but nonexistent already.) All of us are pulling for your speedy recovery. It's a horrible thing to not be able to hear well.
Best wishes and good luck!
Best wishes and good luck!
Here's a link for comparison:
http://tunein.com/radio/2CA-1053-s7639/
This was referenced over on the DX forum.
It's 2CA,an Aussie station on 1053 khz
live and in AM Stereo.
http://tunein.com/radio/2CA-1053-s7639/
This was referenced over on the DX forum.
It's 2CA,an Aussie station on 1053 khz
live and in AM Stereo.
I agree with dd. I've never heard an AM-HD in digital which sounded reasonably natural. The unpleasant sound of the "replicated" (fake) register above 4.5 kHz is a psychoacoustic effect. The human ear is very perceptive when it comes to things like wow and flutter in piano music or horns and artifacts hanging on human speech. Counterintuitively, music sounds better in HD-AM digital than voice because the rich matrix of harmonics tends to mask the artificiality. When it's a single voice speaking, as in talk programming (comprising most of the AM audience these days) the fakeness becomes more pronounced.
Another affliction is the "cascading codecs" effect which comes from satellite-delivered programming and agency production, such as commercials. I've heard spots with such phase error that the overall loudness dropped 50%. Then I heard an agency spot during a network feed where the announcer sounded like he was at the bottom of a swimming pool.
The initial reaction to AM-HD is to the dramatically reduced noise floor. But after some extended listening and putting up with all the other issues, you find yourself equally impressed when you tune back to good ol, NRSC-screwed, 10 kHz wide 85-year old analog AM: "Holy crap, this sounds BETTER!" I gladly put up with an occasional impulse pop or a little nighttime side chatter
in AM listening. Of course, the adjacent-channel HD interference is another matter. THAT has to go. But everyone I know who has tried extended listening to HD-AM digital finds themselves getting fatigued by the Robby Robot audio and sooner or later, reaching for the switch to stop the weirdness. NOT the way to improve AM, IMO.
Another affliction is the "cascading codecs" effect which comes from satellite-delivered programming and agency production, such as commercials. I've heard spots with such phase error that the overall loudness dropped 50%. Then I heard an agency spot during a network feed where the announcer sounded like he was at the bottom of a swimming pool.
The initial reaction to AM-HD is to the dramatically reduced noise floor. But after some extended listening and putting up with all the other issues, you find yourself equally impressed when you tune back to good ol, NRSC-screwed, 10 kHz wide 85-year old analog AM: "Holy crap, this sounds BETTER!" I gladly put up with an occasional impulse pop or a little nighttime side chatter
in AM listening. Of course, the adjacent-channel HD interference is another matter. THAT has to go. But everyone I know who has tried extended listening to HD-AM digital finds themselves getting fatigued by the Robby Robot audio and sooner or later, reaching for the switch to stop the weirdness. NOT the way to improve AM, IMO.
We have a graveyard AM with HD and with the call-in sports shows the cascading of codecs is very annoying and tiresome and fake-sounding.
Strangely enough, the brokered music on the weekends isn't half bad, but still not as good or 'real sounding' as full NRSC AM.
Their simulcast on an FM-HD2 has reasonable quality for music, but still has a 'hollow' quality to it.
In an unrelated vein, speaking of 'wow & flutter' - the Chrysler Factory Sirius radio sounds like a horrible wow & flutter tape and platform motion combined - it is unlistenable - worse than HD. Stand-alone XM was "okay", but my new Sirius is just horrendous. I think we could have a tie for the two worst sounding broadcast venues: Sirius vs HD-AM swirly-matic.
Strangely enough, the brokered music on the weekends isn't half bad, but still not as good or 'real sounding' as full NRSC AM.
Their simulcast on an FM-HD2 has reasonable quality for music, but still has a 'hollow' quality to it.
In an unrelated vein, speaking of 'wow & flutter' - the Chrysler Factory Sirius radio sounds like a horrible wow & flutter tape and platform motion combined - it is unlistenable - worse than HD. Stand-alone XM was "okay", but my new Sirius is just horrendous. I think we could have a tie for the two worst sounding broadcast venues: Sirius vs HD-AM swirly-matic.
Yep. Best-case audio I've heard for AM-HD: kinda like a middling internet webstream, but somehow shriller and more tiresome. Worst case: as I wrote in an RBR article on HD, every announcer sounded like "a vaguely gay Darth Vader" or someone with an adenoid procedure IN PROGRESS (plus a lateral lisp for good measure.)
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