Self interference, new IBOC feature!

Far better than I could ever explain it, Dave Hershberger, of Continental Electronics explains some of the potential problems with increasing the IBOC carrier(s) in an FM HD Radio system.  If you have not already read it, read the entire article, it sheds some interesting light on the IBOC system and how it works.

Transmitting more digital power will certainly increase the digital coverage area and reduce digital dropouts. However, there may be some unintended consequences, which every broadcaster will have to evaluate before increasing digital power.

It is all right there.  What amazes me is that the IBOC proponents do not acknowledge the system’s problems.  Perhaps the above article is a bit over the head of the average general manager, or group VP, whatever the title dejour is.  Engineers should understand this.  Engineers should be able to explain this in an understandable way to managers and owners.  It is the owners or whoever is holding their paper that have the most to loose in this scheme, which is to say, everything.  Forget the FCC, they are in the pockets of their corporate sponsors anyway.  Radio station owner’s and the bankers that control them should take a real hard look at this and see for themselves that they are writing their own epitaph.

History repeats itself?

Letter to the editor in the April 15, 1987 Radio World:

I’ve heard all the garbage I can stand about the AM stereo “issue.”  The problem?

1.  Motorola and Kahn each was a monopoly.

2.  The stations don’t want to waste $6,000 on the wrong system.

3.  The FCC is afraid it will be sued by the “sore loser” in a standard decision.

4. The receiver makers are afraid of wasting millions of the wrong system.

5.  The listeners don’t know anything about AM stereo.

Does any of this sound vaguely familiar regarding some AM “improvement” scheme currently being used?  Those that fail to learn from history are destined to repeat it, Bob.