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To: Quincy who wrote (21988)	8/29/2002 7:55:08 PM
From: 49thMIMOMander	Read Replies (1) \| Respond to of 34857

Well, the old CSPAN issue of "digital must carry" has been very US-informative, unluckily not totally available anymore as archives on even CSPAN, must be because their budget is not enough for large enough hard disks. Vestigial Side Bands are always fun, for those who never got the idea on positive and negative frequencies, or actually worked with realities, in those old days. Eight of the vestiges are even funnier, although many TV guys had some good knowledge, but that little threshold of negative and positive frequencies. Biology. A rudimentary or degenerate, usually nonfunctioning, structure that is the remnant of an organ or part that was fully developed or functioning in a preceding generation or an earlier stage of development. (Jacobs buddy, this Wozencraft, might have written some smarrt stuff on those vestiges) Not that I really think that 1700 idea of the true meaning being embedded in the true words, kind of a quack-CDMA-cult. Anyway, in general longer wavelengths bend better around corners, get around small (relatively speaking) blocking objects, even through dense forests, all those vestigial leaves, much less penetration problems than the shorter ones. Additionally when getting close to the dimensions of resonating waterdrops, chained water molecules, a lot of stuff is happening, line of sight and too many ducks inbetween, the origins of the word "fading" Not much to worry about at the ancient wavelenghts of terrestrial "digital must carry", 80-100MHz, not even at 400MHz, but getting tough when close to 2000MHz, and really tough above it, deadly around 10-20gHz. But as those slow, low frequencies spread out so nicely over the masses it is worth while pumping out the stuff at a high power level, compare some 200kW on good old AM. On the higher frequencies it might be a total waste of kW power, totally wasted by a little rain or a building, not even wiggling nor wobbling due to the excitement of the charged mickey mouse (H2O) molecules. OFDMA is much more complicated, but less chemistry, all the more math, especially not nice and simple math involved. Ilmarinen

To: Quincy who wrote (21988)	8/29/2002 8:21:27 PM
From: 49thMIMOMander	Read Replies (2) \| Respond to of 34857

Btw, thanks for the link, a perfect example of messing up two traditional tongues in the mouth, the old generation RF guys and the new generation QAM, complex (a+jb) DSP guys, ancient euclidians meeting euler and fourier, not to forget the orwellians. No wonder that square root of minus something was difficult already 100 years ago, without getting into the more religiuos aspects of 4 or 5 or more dimensions and how many gilderian angles can dance on a little herzian nipple, at least behind an approaching comet. Ilmarinen Note that terrestrial as well as cable, and especially satellite TV, has been more a matter of "politics" than actual telecommunication, from the start of the Roosevelt radio tranmissions to the selling of the broadcasting TV-ether channels to the best paying commersials, to use US definitions. No wonder another Orwellian Truth Ministery Channel was suggested just some months ago. (if I remember right, getting demented, the official disabling problem was the multipath reflections possible back to the homeland, although 60% TCP/IP goes through virginia??)