[opendtv] Re: VHF vs UHF coverage

Richard Hollandsworth wrote:
 
> NTSC power has always been measured and specified
> as PEAK power, whereas DTV power is always
> measured and specified as AVERAGE power.  Peak
> power for DTV is about 7 dB higher than average
> power.
 
I think you mean NTSC peak is 7 dB higher than NTSC average, yes? With 
scrambling, DTV average and peak power should be virtually identical, I think.
 
> DTV also has a performance advantage of about 5
> dB for a total of 12 dB.
 
I guess some people are skeptical about this extra 5 dB. Also, because analog 
viewers can put up with a lot of visual "abuse," where digital viewers have to 
contend with a cliff, I would err on the side of being more forgiving with DTV 
signal margin.
 
I do totally agree with your point about UHF receive antenna gain vs VHF 
antenna gain, however. It's just that propagation models do show a lot more UHF 
falloff at the fringes, with low altitude receive antennas, etc.
 
Just 3 weeks and we'll know just how accurate those FCC predictions were for 
VHF. My fingers are crossed.
 
Bert
 
_________________________________________________________________
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http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009 
 
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