[opendtv] Re: Fw: Re: FCC Opens TV Spectrum for Broadband Use
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 5 Dec 2010 00:22:53 -0500
Cliff Benham wrote:
> I think one of the major reasons digital radio came about
> is because broadcasters realized they can now 'prevent'
> listeners from receiving programs from outside the local DMA.
How cynical!!
True for the AM band, since HD radio uses 30 KHz of spectrum in that band when
it is used in hybrid mode (10 or 20 KHz if used in all digital mode). But I've
noticed that the stations that initially went to HD radio, during the day, at
least in this area, seem to have quit that. Maybe I should check again. Never
listen to that band much anymore.
BTW, the same would also happen if AM stations tried to transmit dedent quality
audio in AM, spreading out to 30 KHz. Some did just that, years ago. In AM,
your audio bandwidth translates directly to RF bandwidth, on both sides of the
carrier. So, 15 KHz audio AM takes up 30 KHz.
I like HD radio, though. Should be used more effectively.
Bert
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