WBBM AM 780 IBOC obliterates airport info @ 790-800?

[Tom Wells]

Perfectly readable all over the city, strong within 5 miles of airports, but totally wiped out when BBM goes IBOC.
Are these public low power services afforded any future in ibquity's vision of tomorrow?
What about traffic services and public notfication stns?

 

[clouseau]

Unfortunately, the current rules say "NO" they are not afforded any protection.

That's why AM IBOC must die. I'm an AM radio guy. And I truly believe,,,

AM IBOC has to go. (actually "not come" )

FM = maybe. AM = No Way

Clouseau

 

[Tom Wells]

I knew these are shoehorned into little holes, and are afforded no protection, but they are part of the service I have become accustomed to and the radio landscape I enjoy.

I just wanted to point out another " d'oh! " consideration.

 

[Black_Shire]

Are there any AM stations on 540 kHz running IBOC? There are aviation Non-Directional Beacons (NDBs) operating from 530 kHz down to 200 kHz, and AM IBOC on 540 kHz would wipe out NDB signals down to 510 kHz (under the best of circumstances) or even down to 490 kHz for poorly-engineered AM IBOC installations.

Most NDB transmitters only put out 25 watts to 40 watts and would be no match for AM IBOC splatter even from small, 1 kilowatt AM radio stations. If the FCC ever authorizes night-time AM IBOC, neighboring-channel NDBs even farther away will be interfered with via skywave.

Many of these NDBs are at Locator Outer Markers (LOMs) which aircraft use to line up for the final approach to the runway, and thus are critically important for safety. Our local LOM NDB for Fairbanks International Airport is FA 510 (it broadcasts the Morse Code identifier "FA" on 510 kHz), and its 25 watt signal would be obliterated if there was a local AM IBOC station on 540 kHz.

Many NDBs also broadcast aviation weather updates (the TWEB, Transcribed WEather Broadcast) to pilots, and AM IBOC interference would render these voice weather advisories unintelligible on NDBs operating within a few tens of kilohertz of the bottom edge of the AM broadcast band.



-- Black Shire

 

[SUPERCASTER]

Are there any AM stations on 540 kHz running IBOC? There are aviation Non-Directional Beacons (NDBs) operating from 530 kHz down to 200 kHz, and AM IBOC on 540 kHz would wipe out NDB signals down to 510 kHz (under the best of circumstances) or even down to 490 kHz for poorly-engineered AM IBOC installations.
Most NDB transmitters only put out 25 watts to 40 watts and would be no match for AM IBOC splatter even from small, 1 kilowatt AM radio stations. If the FCC ever authorizes night-time AM IBOC, neighboring-channel NDBs even farther away will be interfered with via skywave.

Many of these NDBs are at Locator Outer Markers (LOMs) which aircraft use to line up for the final approach to the runway, and thus are critically important for safety. Our local LOM NDB for Fairbanks International Airport is FA 510 (it broadcasts the Morse Code identifier "FA" on 510 kHz), and its 25 watt signal would be obliterated if there was a local AM IBOC station on 540 kHz.

Many NDBs also broadcast aviation weather updates (the TWEB, Transcribed WEather Broadcast) to pilots, and AM IBOC interference would render these voice weather advisories unintelligible on NDBs operating within a few tens of kilohertz of the bottom edge of the AM broadcast band.



-- Black Shire

Since the iBiquity HD radio system is neither In Band nor On Channel, it not only should not get final approval, the cartel's buzzfest should cease. It seems the reason the iBiquity system was chosen, instead of another system such as FMeXtra, (www.dreinc.com) is that iBiqity HD Radio, DOES interfere, eliminating competition for listeners.