Chuck said: IBAC is an acronym used in the engineering world and is found even in the IEEE (Institute of Electrical Engineers) publications. ///// Actually you left out a very important component of the name Chuck. The IEEE is the Institute of Electrical and Electronics Engineers, Inc. I am aware of the IEEE using the term IBAC relative to HD radio back in 2001. But I haven't noted any use since then. I performed a search for IBAC on the IEEE internal search engine which only produced documents referring to Image Based Access Components - nothing to do with HD broadcasting. At any rate, we're talking apples and oranges. I don't believe that the IEEE would ever use the term IBAC in the derogatory context that it is being used here.
I have originals of the USA Digital Radio (USADR) brochures and data sheets that were distributed in the mid 1990s when HD broadcasting was first surfacing to the eyes and ears of the public. All references to the technology, including several references from the IEEE, refer to IBOC, DAB, or HD. I don't find any reference to IBAC in the literature. I also have one of the original 1995 USADR demo CDs (produced by CBS Radio) that provided an audible comparison of the HD and analog over the air signals from several AM and FM stations including WBBM-FM, KUNV-FM, KUSA-AM, and the experimental AM transmitter on 1660 kHz located in Cincinnati. It's very interesting to read and hear this early documentation on the subject. I had forgotten how long ago that Cincinnati experimental station had been on. That was well before the expanded band opened up. Since it is on this 1995 CD it must have been prior to that. I believe I heard that the same transmitter was later moved to Las Vegas for the KUSA-AM demo transmissions (also on 1660) at the NAB in 1995. So the Cincinnati experiments (sounds like a good name for a conspiracy) were probably around 1993 or 1994. I never did manage to hear the Cincinnati station. I believe that most of their transmissions were during normal business hours during weekdays. I did received two QSLs for the KUSA demo transmissions. One was an 8 1/2 x 11 certificate from the engineer/operator in Las Vegas and the other was a traditional QSL card produced by USADR headquarters in Chicago. The latter was also my source for the brochures and CD that I mentioned. Patrick Griffith, Westminster CO Broadcast Technician NRC Broadcasting - Denver http://community.webtv.net/N0NNK/ http://community.webtv.net/AM-DXer/ _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
