Interference Case #1-5 (AM).......Shocking Audio Samples of Interference

[audiophile.]

That would be a good idea, but the FCC is overrun by lawyers who couldn't pass a ham test.

 

[dbdigital]

"IBOC is just not a viable solution for hybrid broadcasting on AM."

Viable for whom, the dxer, the rural listener, the competition? I don't have any issues on the standard BCB. Of course I don't normally listen to stations on first adjacents.

The very fact that on one of the audio samples a station was actually interfering with itself proves to me that IBOC and analog on AM doesn't mix.

db

 

[SUPERCASTER]

"IBOC is just not a viable solution for hybrid broadcasting on AM."

Viable for whom, the dxer, the rural listener, the competition? I don't have any issues on the standard BCB. Of course I don't normally listen to stations on first adjacents.

The very fact that on one of the audio samples a station was actually interfering with itself proves to me that IBOC and analog on AM doesn't mix.

db

Putting digital and analog audio down the same pipe, never did mix. In spite of iBiquity's extensive manipulations it still does not.
Analog vs hybrid HD Radio- "The cure is worse then the disease."
Analog broadcasting has limitations and occasional problems, but overall it is a pretty reliable, time tested, publicly accepted delivery system.
HD Radio, is problematic right from the start, and just goes down hill from there. It promises a lot, but delivers nothing but expense, deception, delay, interference, and problems.
As has been shown, with HD Radio, the in-spec spectrum analysis you see at the transmitter is often not the same, way out-of-spec spectrum analysis you get a mile or two away.
This HD Radio stuff is all over-hyped, expensive trash, and all the additional interference will just drive away AM and FM listeners. The fidelity, coverage, and compatibility, are nowhere near what has been promised.

Hybrid operation with the adjacent channel iBiquity system should not be approved, on AM or FM. Neither delivers what was promised.
On AM, analog fidelity is degraded, digital noise added, hours of digital operation limited, coverage poor, and adjacent channel interference greatly increased.
On FM, HD Radio has poor coverage, adds noise to the detected analog stereo signal, and (like HD AM) tresspasses on your neighbor's property.
Neither AM or FM HD radio transmission is compatible with current station assignments, and therefore both are extremely problematic, and should not get final approval.
There is a fully compatible digital system for FM called FMeXtra.
http://www.dreinc.com/
But iBiquity supporters can't keep their pants on and want the incompatible, defective iBiquity system to get immediate final approval, (without further debate or testing) just because there have been a small number of (often defective) HD radios sold, and many supporters are involved in the implementation, sales, programming, or promotion of HD Radio, and have an interest in seeing that HD Radio succeeds.

 

[audiophile.]

Here here!

 

[dumber than a box of hair]

I'm going to listen to more, but the first thing I obeserve is their example of 670 KLTT interfering with 680 in California. While they mention that the IBOC signal goes away, they don't mention that at the same time the analog drops from 50kw to 1.4kw!

I'd like to hear what that frequency sounds like with IBOC off, but at 50kw. Additionally (and I'm not knocking it) they say they're using a high-end Grundig with a beverage antenna...NOT an everyday setup. I bet the common car radio with it's commonly narrow bandwidth would have little problem. Just my $.02.

Update:

I've now listened to the whole thing. While it's pretty dramatic, I think that it was set up specifically (with stations specifically chosen) to be just that. I'm not downplaying the test, but I think it's akin to a pro-IBOC test where they use the cheapest, deafest clock radio they can find and say "see...no problem!!"

So, you want one that wasn't "set up" in advance?

I can clearly hear the digital carriers of WFAN (660) in WRKO's (680) audio. I'm less than four miles from WRKO's transmitter site, in a major lobe, and 174 miles from the WFAN site. That occurs on EVERY AM radio I own. If I'm listening at sunset, I can hear the carriers disappear, and by using a second radio I know they're coming from WFAN. WRKO's field strength at my house is about 87 mV/m daytime and 98 mV/m nighttime.

 

[hipporadio]

I won't waste the owners bandwidth and your time with a drawn-out review... I listened, and I've heard the output of my own trusted radios, so I'll just concur--NO IBOC at night...

In fact, no IBOC at ANY hour would be just fine by me!

I can't believe this "debate" has gone on as long as it has among savvy, intellectually-honest engineers. WHO is getting smitten with who ???

AM IBOC in a fantasy world = NO BENEFIT... AM IBOC in the real world = interference that may be the "last straw" for AM listeners + diminished analog audio quality at a point in time when many AM stations can finally (thru improved transmitter technology) offer at a higher level + super-lossy low bit-rate compressed audio that rivals ONLY circa 1997 RealAudio v3 on the net + high-priced low-performance radios the latest industry survey reported 70% would not appreciate if provided for FREE = A "no brainer"... Send your toe into the crotch of AM HD-Radio!

Let's get this IBOC bast**d back into the bag!