Do i understand you right that you expect VGA cables to be better engineered compared to digital cables that tend to be more engineered with "a zeros and ones signal doesn't need all that great quality cabling and we can make more profit with cheaper cables and noone will notice" in mind.
What would you vote for if the quality of the analog and digital cables would be both of high quality, properly terminated? (I know which i prefer on a short run from tower to lcd, which is what made reading about all of this rather surprising.) Thanks, Daniel On Sun, Aug 29, 2010 at 4:29 PM, Gene Heskett <gene.hesk...@gmail.com> wrote: > On Sunday, August 29, 2010 04:57:33 pm Daniel Goller did opine: > >> Wonder if this means vga actually does win over dvi in this use case. > > That will, speaking as a broadcast engineer with a good working knowledge > of cables and terminations, depend on the overall quality of the cable > used, and the precision of the terminations used AT BOTH ENDS of the cable. > > vga is an analog signal, and is best at almost any distance as long as the > cable and terminating impedances are well matched.. And by matched, I mean > if the cable is a 73 ohm cable (and most of the so-called video cables are) > but it is terminated with the out of the box 75 ohm resistor, as a parallel > load on the receiving end, and as a source from a video amplifier with a > very low output impedance that is running at 2x the signal level, then its > going to be quite decent for goodly run lengths, for good low loss cabling, > 2 or 3 hundred feet. > > Digital, OTOH, is often thought of as a yes or no signal so the designers > tend to play economy games with the terminations and cable qualities. > Digital errors you will often see as blinky pixels when right at the end of > that cables length that it can maintain a picture at all. > > Generally speaking, distance runs should be in vga, but that in turn limits > the available max pixels, usually to less than the 1680x1050 that this > monitor is natively capable of. > > If a digital cable can't seem to make the run, then I expect it could be > fixed with cabling that more nearly matches the termination schemes used, > paying more attention to the terminating load at the monitor, than to the > source impedance at the video card source. If there isn't much echo from > the monitor that could bounce back off a poor source termination, that would > be the ideal target to shoot for. And there will probably be stubborn > cases where the monitors input circuitry just simply isn't correct for any > available cabling, one might have to play in the monitors circuitry to see > if it could be improved. However, in terms of making it work in a > reasonable time frame, the best choice might be to throw money at a > different monitor brand name, with the understanding that its returnable the > next day if it doesn't work. The well designed one will Just Work(TM) on a > surprising length of decent cabling. > >> For one I will make sure the monitors allow analog and digital input, >> just in case. > > I have so far, had great results from SamSung, even their hidef tvs, when > driven by a computer, are quite stunning. This 205bw is about 4 years old > now and I had to replace that pair of filter capacitors on the power board > about a year ago as the ccfl backlight was getting intermittent, but for me > that is the cost of running it the 25 miles to the tv station & using their > stock of those caps, which we use by the shoebox full. One of the 'perks' > of being the retired CE. ;-) > > -- > Cheers, Gene > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > What I need is a MATURE RELATIONSHIP with a FLOPPY DISK ... > > ------------------------------------------------------------------------------ > Sell apps to millions through the Intel(R) Atom(Tm) Developer Program > Be part of this innovative community and reach millions of netbook users > worldwide. Take advantage of special opportunities to increase revenue and > speed time-to-market. Join now, and jumpstart your future. > http://p.sf.net/sfu/intel-atom-d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
