This is the IBOC Section of
The Broadcast Archive

Maintained by:
Barry Mishkind - The Eclectic Engineer
 

2002 appears to be the year IBOC (In Band On Channel) Digital radio made its first "mark."

KROQ-FM became the first station to "Officially" run IBOC 24/7 on September 29, 2002. KROQ chose the Orban Optimod 8400 with digital options to drive the processing. (Some stations, including one in Seattle had been running more or less consistent IBOC since mid/late 2002, but essentially in an "experimental" mode. Updated information will appear if available.)

The tests conducted in Seattle, along with other cities gave Ibiquity the strength to head toward a nationwide rollout in early 2003. What is IBOC (or IBAC - In Band, Adjacent Channel)?  Let's take a look.

IBOC for AM and for FM.

IBOC impresses digital information on top of the regular analog signal. In general, you could say it "increases the sidebands" of the station, hence some complaints from the DX crowd about making the band "hash."

Among the "pluses" claimed for IBOC:

    1. Reduced multipath on FM
    2. The ability to run more than one program at a time.
    3. The ability to send digital text at the same time.

 

 

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