Ibiquity digital encroaches about 50 kHz into the FM adjacent channel.
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Saving AM Radio
- Thread starter BruceB
- Start date
HD Radio FM Hybrid Waveform Noise and Emissions Limits*
Frequency Offset Relative to Carrier Level, dBc/kHz
100 – 200 kHz offset -30.0
200 – 207.5 kHz offset [-30.0 - (|frequency in kHz| - 200 kHz) • 4.187]
207.5 – 250 kHz offset [-61.4 - (|frequency in kHz| - 207.5 kHz) • 0.306]
250 – 540 kHz offset -74.4
540 – 600 kHz offset [-74.4 - (|frequency in kHz| - 540 kHz) • 0.093]
>600 kHz offset -80.0
Here is the NRSC Standards document:
Oh, and even if it did? Who cares?
As long as the adjacent station remains within the prescribed mask:I'm now trying to remember what the outcome was in this complaint:
KATY-FM files FCC petition against KRTH HD Radio interference | Radio & Television Business Report
All-Pro Broadcasting, Inc., licensee of KATY-FM, 101.3 MHz, Idyllwild, California (Riverside-San Bernardino), is filing a Petition with the FCC seeking relief from ongoing and destructive interferencerbr.com
Any complaint would have no standing.
As I mentioned to Tom, even if it did encroach, what difference does it make? Nobody uses capacitive-tuned radios anymore.
You could email the guy who wrote the complaint, he gave his email address in this post:I'm now trying to remember what the outcome was in this complaint:
KATY-FM files FCC petition against KRTH HD Radio interference | Radio & Television Business Report
All-Pro Broadcasting, Inc., licensee of KATY-FM, 101.3 MHz, Idyllwild, California (Riverside-San Bernardino), is filing a Petition with the FCC seeking relief from ongoing and destructive interference
https://radiodiscussions.com/threads/katy-files-hd-interference-petition.582646/post-5204878
Hmmmm.... I remember complaints about mutual interference between KDKA/1020 Pittsburgh and WBZ/1030 Boston, with each other's digital hash wiping them out even inside their own markets. I can personally attest to KNX/1070 wiping out KDUS/1060 within 2 miles of the latter's transmitter, where I lived at the time. This was many years ago, of course. If IBOC on AM isn't completely dead now, it should be.
AM HD didn't fall off the map because of complaining DXers or even adjacent channel issues. It died because nobody cared.
Man, I'll be mad if they remove WABC AM since they're owned by red apple media, because it's one of the AM stations to bring back Music Radio
If who removes it?
Nobody is “removing” AM stations, particularly one of the original 1-A clear channel ones.
K.M. Richards
Program Director, The Eighties Channel™
Whaaaaaaa?
I know, right? They need to avoid drinking and posting.
The only people I recall complaining about IBOC, both on AM and FM, were DXers. I don't recall any regular AM or FM listeners ever complaining about it, at least online where I was hanging out, or the few people I'd talk with and discuss radio. Most 'regular' FM or AM listeners I've reacted with over the years weren't really aware of HD, AM or FM.
Although I'm a DXer myself, IBOC didn't really bother me. In the 2010's when I heard the 'buzz' on a few channels I heard progress being made. I thought HD AM was a step forward. I hoped it would take off. Of course, we all know it didn't.
The same DXers who complained about IBOC now complain about sports talk increasing on AM, they complain about Sports Bet talk, they complain that there are too many stations on the band, they complain about a lack of music on the band (do they even tune around and listen?) -- DXers seem to be the biggest complainers about the medium they claim to enjoy listening to.
Although I'm a DXer myself, IBOC didn't really bother me. In the 2010's when I heard the 'buzz' on a few channels I heard progress being made. I thought HD AM was a step forward. I hoped it would take off. Of course, we all know it didn't.
The same DXers who complained about IBOC now complain about sports talk increasing on AM, they complain about Sports Bet talk, they complain that there are too many stations on the band, they complain about a lack of music on the band (do they even tune around and listen?) -- DXers seem to be the biggest complainers about the medium they claim to enjoy listening to.
I certainly can't disagree there.
I’m a DXer who never cared about IBOC, I think music sounds like crap on AM, but I can’t stand sports betting talk on AM, FM or TV, or the fake betting “casino style games” that are advertised. I want to hear about the players and coaches and teams, not what the line is.
I think he's referring to the original topic
(Saving AM Radio)
It Bothers Other Channels
If you look at page 7 of that document it dictates that the digital carriers should be measured in a 1 KHz bandwidth. However, the bandwidth of the typical FM IF filter is about 200 KHz. So the actual interference is 13 db greater. It is very real. I'm amazed it's still up - I guess nothing disappears on youtube - but I took this video almost 12 years ago. Nothing has changed, except I don't have that pickup truck any more...
The deception by Ibiquity is more than just the "HD" label. It extendes to RF bandwidth trickery. As I mentioned in the video, the typical listener thinks that digital noise is just weak signal. So they move on, and the adjacent-channel station loses listeners.
Dave B.
It Bothers Old Codgers.
There is no deception. Where is listing to first adjacent signals of any interest except to the few hundred DXers left?
It’s Xperi now, not Ibiquity