Jeff, I would question whether AM-HD (or FM-HD, for that matter) has ever been "accepted." Certainly not by the public or an overwhelming majority of broadcasters. If you mean acceptance by the Commission as the US digital radio standard, that's true -- and due mainly to two factors: 1) early on, iBiquity needed to entice both AM and FM unsuspecting broadcasters with its snake oil to generate support, and 2) the broadband-crazed Commission doesn't really give a damn about AM-FM radio, except for the fees and fines it generates and possibly future spectrum grabs.
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AM HD TURNOFF PACE ACCELERATES
- Thread starter Savage
- Start date
Maybe somebody else could answer that on a legal basis. i.e., Has AM-HD (or FM-HD) ever been officially "type-accepted".local oscillator said:
(Then again, "UL approved" labelled extension cords never had to work to be labelled "UL approved", anyway.)
The reason is clear. That the system is not dependable and the disadvantages outweigh the advantages.
At least when CD's were "sold" to the broacaster, the technology worked even though there were moving parts that could break.
Jeff in Sa-ra-so-ta!
This is only true because the vast majority of Kahn-capable multi-system receivers were of the "forced stereo" design, which would receive any signal under any condition in "stereo" -- even on stations that are not transmitting AM Stereo at all.badjef said:
I have one of the rare Sansui TU-S77AMX multi-system tuners with automatic pilot tone detection of all four systems (Magnavox, Kahn, Motorola, and Harris) and automatic mono/stereo switching, and when it attempts to decode a Kahn signal, it is just as touchy about dropping out to mono as it is with C-Quam signals. And thanks to its synchronous detector, when the synchronous PLL can't lock onto the signal, it mutes the audio completely, making it useless for DXing or any kind of weak signal reception.
But Leonard Kahn may have had the last laugh, because while there is no C-Quam in New York City anymore -- the closest stations are WCTC in NJ and WAXB (ex-WREF) in CT -- 1600 WWRL is transmitting Kahn "POWER-side", complete with the 15 Hz Kahn AM Stereo pilot tone. The Sansui tuner decodes this as if it was a stereo signal, and the audio comes out of the left channel much louder than in the right channel -- quite appropriate for a liberal talk station.
Stuff like that, makes me go “hmmmm”...satech said:
I had the Radio Shack AM Stereo tuner and a “Fujitsu 10” from my ‘87 Toyota. Kahn
sent me “The Secret” which I modified both radios to accept the one device.
Recordings I had were in stereo from home and in the car. It was not kicking pilot when
there was no stereo signal.
But it would kick stereo with about 110% of signal coverage. Yes, I would receive a
stereo signal from a station before I could hear it.
What prompted me to begin with was not Kahn, but the C-QuAM radios. It would kick
the stereo on WNBC but only for a second. It was enough for the curiosity to be piqued -
for it sounded better than (sometimes stronger) C-QuAM stations.
Powerside sounded better in mono. Each of the powerside exciters has the ISB built in. In
the
event enough of them were sold and he won the AM Stereo standard war, all the
powerside stations had to do is flip the switch.
A condition that still exists today.
So, now you understand why I’m not giving up on a system that lost. The winner lost, too.
And so did its successor.
Jeff in Sa-ra-so-ta!
local oscillator said:
Your first point is not factual. AM was an afterthought, which leads to the second point.
The reason, or at least the main reason, why we got AM HD was the belief that the FCC would not approve FM HD unless there was a matching AM digital system. The FCC was in its "catch op with digital" which came from the TV side. As we know, the obsession with digital got us a TV system that has essentially eliminated useful and usable portable devices making TV useless in emergencies. And it got us a digital system that avoided the use of spectrum for a digital band but resulted in an on-band solution that is full of compromises.
You know I never had a problem with AM stereo. (C-QuAM)
the Stereo was there till the station was just about gone.
When they perfected that platform motion it was excellent.
And no it did not drop to mono.
You must have had a real bad experience with the C-QuAM system.
Possibly on the worlds worst engineered station.
the Stereo was there till the station was just about gone.
When they perfected that platform motion it was excellent.
And no it did not drop to mono.
You must have had a real bad experience with the C-QuAM system.
Possibly on the worlds worst engineered station.
I just wish I could put my little Sony AMAX Walkman to good use with an AM stereo station again. I took with me to LA and back a few years back and didn't get a single station in stereo, even the ones that profess to be still in C-QUAM (the Navajo station in Window Rock and another NM one in, er, Grants or somewhere, didn't decode.) Either EVERYONE has turned it off now or the radio's got a problem. Even WLS at night doesn't give me any stereo. I get plenty of stereo "noise" since it passes everything through the decoder, but no left/right differentiation on any station. Sad.
Yep! 225 is the sorry count right now, with five more stations dumping HD-AM this summer (so far.)
It's interesting to note that most of the recent turn-offs are Clear Channel stations. CC has also stopped running the HD on-air promos (as reported on several sites.) Perhaps clearer thinking is starting to prevail at Clear Channel??
A great Christmas present (to all) would be for us to be under 200 stations by year's end.
Tick....tock......tick..... ;D
It's interesting to note that most of the recent turn-offs are Clear Channel stations. CC has also stopped running the HD on-air promos (as reported on several sites.) Perhaps clearer thinking is starting to prevail at Clear Channel??
A great Christmas present (to all) would be for us to be under 200 stations by year's end.
Tick....tock......tick..... ;D
I hate IBOC sideband...
KCBS has it, KCBC has it..:/
and the CEO of CBS thinks t's a good idea on AM, I know KCBC isn't owned by CBS
KCBS has it, KCBC has it..:/
and the CEO of CBS thinks t's a good idea on AM, I know KCBC isn't owned by CBS
;DThe Best Buy site shows both the original -01 and
the -02 as backordered,which is odd since they always
seem to have plenty locally <G>:
http://www.bestbuy.com/site/Insigni...ayer/9375071.p?id=1218094581941&skuId=9375071
and
http://www.bestbuy.com/site/Insigni...play/9972092.p?id=1218231082609&skuId=9972092
The erstwhile HD boombox is on backorder,too:
http://www.bestbuy.com/site/Insigni...adio/1800151.p?id=1218293490188&skuId=1800151
the -02 as backordered,which is odd since they always
seem to have plenty locally <G>:
http://www.bestbuy.com/site/Insigni...ayer/9375071.p?id=1218094581941&skuId=9375071
and
http://www.bestbuy.com/site/Insigni...play/9972092.p?id=1218231082609&skuId=9972092
The erstwhile HD boombox is on backorder,too:
http://www.bestbuy.com/site/Insigni...adio/1800151.p?id=1218293490188&skuId=1800151
I just finished reading the buyer comments from the three Best Buy links provided by rtc. What a hoot! And these comments come from the tiny slice of the public that was actually predisposed to purchase an HD radio! These poor unsuspecting consumers don't realize, though, that it's the junk-science HD technology that makes their radios such "Bad Buys."
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