[opendtv] Re: USDTV demos at NAB
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 29 Apr 2004 16:13:54 -0400
Doug,
You lost me completely. You mean we've been wasting all that money on power
bills for our UHF 23?
WLNS Channel 6 here in Lansing runs at 100 kW ERP and covers an area of
31,907 sq. km. We, WKAR Channel 23, run at 1,230 kW ERP and cover an area
of 16,624 sq. km.
Where does UHF dipole gain come in?
John
----- Original Message -----
From: "Doug McDonald" <dtvmcdonald@xxxxxxxxx>
> Not really. VHF uses lower powers because
> a tuned dipole antenna has a receiving area
> inversely proportional to the square of the frequency.
>
> However, at UHF it is far easier to get gain; a UHF
> antenna as big as a channel 2 dipole will have a truly
> gigantic gain and will pick up the same actual
> fraction of the ERP as will the Ch. 2 dipole.
>
> Also, UHF signals penetrate modern houses with
> foil heat barriers in the walls much better than
> VHF, especially low VHF, because there are several
> waves in the size of the average window at UHF, only
> one at high VHF, and less that one on Ch. 2.
>
> > VHF is much less line of sight.
>
> This is true. Digital Ch. 3 needs far more power than
> it is getting.
>
>
>
> Doug McDonald
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