----- Original Message -----
From: "Jim B." <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, December 21, 2005 11:15 AM
Subject: Re: [Repeater-Builder] hdtv radio shack ant ????
> mch wrote:
>
>> You know, this subject (mail subject line) reminds me of the stories I
>> was told about them coming out with antennas for *COLOR* TV that were
>> interpreted to be different from B&W TV antennas. Supposedly, for color
>> TV you needed a Color TV antenna.
>>
>> B&W TV, Color TV, HDTV... they ALL use the same frequencies and the same
>> antennas would work equally well.
>>
>> Joe M.
>
> The only difference is that color requires more signal then b&w, and
> digital requires more signal then color. (Just like stereo FM requires
> more signal then mono.) Hence the fact, if one looked, that "color"
> antennas were just higher gain, and "digital" antennas are more gain yet.
>
> --
> Jim Barbour
> WD8CHL
Actually, it requires considerably less signal than analog TV (color or
B&W). The coding gains of digital allow it to operate much closer to the
noise floor than analog. If you look at the power assignments of television
broadcast stations, the DTV power to replicate coverage is in nearly all
cases much less, unless the analog station is on VHF and the paired DTV
station is on UHF. For instance, I am the CE for an eleven station
network...most of our megewatt UHF analog stations are coverage matched very
well by their 50 KW digital counterparts. The rule of thumb is that average
digital power is 12 dB less than peak analog power.
Hap Griffin
WZ4O
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