Re: Next year hdtv law comes into effect

On Thu, 28 Jul 2005 16:12:49 -0400 Jeff Rife <wevsr@xxxxxxxx> wrote:
| (phil-news-nospam@xxxxxxxx) wrote in alt.tv.tech.hdtv:
|> On Thu, 28 Jul 2005 12:25:03 -0400 Jeff Rife <wevsr@xxxxxxxx> wrote:
|> | (phil-news-nospam@xxxxxxxx) wrote in alt.tv.tech.hdtv:
|> |> | The average power level, ERP, of the 480 COFDM transmitters in the UK is
|> |> | around 3.5 kW. The average COFDM transmitter world wide is probably
|> |> | under 30 kWs. What a strange twisted way of thinking about COFDM and
|> |> | 8-VSB. COFDM needs more power? In the real world COFDM uses 1/100 the
|> |> | average power that is being used by 8-VSB and doing a far better job of
|> |> | it at those power levels.
|> |>
|> |> Out to what distance? Is it going to make it 100 miles on 10 kW?
|> |
|> | No. The average reception distance is less than 20 miles. In some cases
|> | it is *far* less.
|>
|> Suburbs of New York City extend much much further than 20 miles. They
|> are almost all the way to the end of Long Island, and over in New Jersey,
|> it's half way across the state.
|>
|> Dallas and Fort Worth is even larger.
|
| Right. I know that. Bob was talking about the transmitters in the UK,
| where the average reception distance is the "less than 20 miles" that I
| quoted.

I've becoming more and more convinced that 8-VSB is the right choice for
the USA. I'm not trying to think about what is right for the UK. Maybe
COFDM is right for UK. But that's not my concern.


| Which is why low-power COFDM won't work in the US without building a *lot*
| of additional towers.
|
| Nobody has ever tried high power COFDM, so there is no way of knowing what
| it will do.

And of course the tests weren't done with full power and typical distances
with typical problem sources active, I bet.

--
-----------------------------------------------------------------------------
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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.

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