[opendtv] Re: The "real" problem with OFDM in the U.S.

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Fri, 18 Mar 2005 09:44:08 -0500

At 2:55 PM -0500 3/17/05, Allen Le Roy Limberg wrote:
>Low height-above-average-terrain broadcast antennas are not very good for
>DTV because multipath problems get out of hand.  That seems to me to make
>the small stick approach difficult to justify economically.  The towers
>still need to be high, even though effective radiated power is low.

I think we are talking about relative tower heights. We may need 
towers that are somewhat taller than todays freestanding cell phone 
towers, but we will not need 1,000, 2,000 foot towers, especially for 
the gap fillers.

The mains will work fine at 200-500 feet depending on terrain and 
network design. Gap fillers can be sized to the coverage area they 
need to serve, and will typically be lower.

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