[opendtv] Re: Bolivia TV standard mystery

  • From: "Ian Mackenzie" <ian@xxxxxxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 21 Dec 2006 09:38:43 +1100


>Albert E wrote Manfredi,

>Take a market area of, say, 80 mile diameter, and only small 
1 KW towers to cover it, on one frequency channel. Even with 
COFDM at 1/4 GI, a passive system won't work (28 mile spacing max).

Why would you need lots of 1KW towers to cover a 80 mile area?

That's just the wrong way to do it.

Take Sydney Australia for example where a single VHF 3.5KW TX giving
50KW ERP on a single tower covers an area this big adequately with 
2 small repeaters in a separate UHF SFN.

Much cheaper than trying to cover the area with lots of small TX sites
In a SFN or an "Earth Scorcher" main UHF TX.

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