September 2010
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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.


A pessimist sees the glass as half empty. An optimist sees the glass as half full. The engineer sees the glass as twice the size it needs to be.

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~1st amendment to the United States Constitution

Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
~Benjamin Franklin

The individual has always had to struggle to keep from being overwhelmed by the tribe. To be your own man is hard business. If you try it, you will be lonely often, and sometimes frightened. But no price is too high to pay for the privilege of owning yourself.
~Rudyard Kipling

Everyone has the right to freedom of opinion and expression; this right includes the freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers
~Universal Declaration Of Human Rights, Article 19 was discovered, and not invented, and that these frequencies and principles were always in existence long before man was aware of them. Therefore, no one owns them. They are there as free as sunlight, which is a higher frequency form of the same energy.
~Alan Weiner

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