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 > > ---------------------------------------------------------------------- > You can UNSUBSCRIBE from the OpenDTV list in two ways: > > - Using the UNSUBSCRIBE command in your user configuration settings at > FreeLists.org > > - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word > unsubscribe in the subject line. > > > > ---------------------------------------------------------------------- > You can UNSUBSCRIBE from the OpenDTV list in two ways: > > - Using the UNSUBSCRIBE command in your user configuration settings at > FreeLists.org > > - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word > unsubscribe in the subject line. > > > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.