[opendtv] Re: VHF vs UHF coverage

The last time we were within a few weeks I was confidently predicting
all would soon be revealed.  This time I'll wait.

- Tom


Dale Kelly wrote:
> Bert, I was composing an answer to this when your reply came in; you took
> the words out of my mouth!
>
> IMO, you nailed it.
> Thanks, Dale
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx
> [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Albert Manfredi
> Sent: Saturday, May 23, 2009 3:01 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [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
>
> _________________________________________________________________
> Windows Live™: Keep your life in sync.
> http://windowslive.com/explore?ocid=TXT_TAGLM_BR_life_in_synch_052009
>
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