Hap Griffin wrote:
> ----- Original Message -----
> From: "Jim B." <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> 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
Not gonna argue-experience has shown the DTV's need a much better
installation on the recieve end-across the board (VHF or UHF).
And not just directionality either.
-eos-
--
Jim Barbour
WD8CHL
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
