Selecting SVGA cable
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From: JimL on 19 Nov 2009 18:47 I'm looking at SVGA cable for an extension monitor. They show two similar cables, the only difference, including price, is that one has a ferrite beads, apparently at each end, and one doesn't. Why would I want ferrite beads or not want ferrite beads? Thanks -- For most of us the most danger is most politicians. JimL
From: Pen on 19 Nov 2009 18:55 JimL wrote: > I'm looking at SVGA cable for an extension monitor. They show two similar > cables, the only difference, including price, is that one has a ferrite > beads, apparently at each end, and one doesn't. Why would I want ferrite > beads or not want ferrite beads? > > Thanks > To prevent which would interference on your screen also to improve the quality of the transmitted signal from the computer to your screen. I would say get the one with the beads.
From: JimL on 19 Nov 2009 19:12 "Pen" <nospam(a)nospam.net> wrote in message news:he4lu5$a50$1(a)news.eternal-september.org... > JimL wrote: >> I'm looking at SVGA cable for an extension monitor. They show two >> similar cables, the only difference, including price, is that one has a >> ferrite beads, apparently at each end, and one doesn't. Why would I want >> ferrite beads or not want ferrite beads? >> >> Thanks >> > To prevent which would interference on your screen also to improve the > quality of the transmitted signal from the computer to your screen. > I would say get the one with the beads. I'm very curious about my second question. Why would I want a cable without the beads? That's another way of saying "why do they sell cables without the beads? And for the same price?" -- For most of us the most danger is most politicians. JimL
From: VanguardLH on 19 Nov 2009 20:02 JimL wrote: > "Pen" <nospam(a)nospam.net> wrote in message > news:he4lu5$a50$1(a)news.eternal-september.org... >> JimL wrote: >>> I'm looking at SVGA cable for an extension monitor. They show two >>> similar cables, the only difference, including price, is that one has a >>> ferrite beads, apparently at each end, and one doesn't. Why would I want >>> ferrite beads or not want ferrite beads? >>> >>> Thanks >>> >> To prevent which would interference on your screen also to improve the >> quality of the transmitted signal from the computer to your screen. >> I would say get the one with the beads. > > I'm very curious about my second question. Why would I want a cable without > the beads? That's another way of saying "why do they sell cables without > the beads? And for the same price?" Cheaper quality doesn't always equate to cheaper price. Some cables have better shielding so using the beads to induce a reverse signal to provide impedance to higher-frequency noise isn't needed (because the noise didn't get induced into the signal wires inside the better shielded cable in the first place). Better shielding tends to make the cable stiffer. Ferrite beads allow use of a more flexible cable because of less effective shielding. Ferrite beads are cheaper than adding better shielding to the cable. http://en.wikipedia.org/wiki/Ferrite_bead With the 2 cables being the same price, I doubt the non-beaded cable has adequate shielding. Heavy shielding costs a lot more than a couple ferrite donuts on the ends. So get the beaded cable.
From: JimL on 21 Nov 2009 16:22
"VanguardLH" <V(a)nguard.LH> wrote in message news:he4pqf$gs7$1(a)news.albasani.net... > JimL wrote: > >> "Pen" <nospam(a)nospam.net> wrote in message >> news:he4lu5$a50$1(a)news.eternal-september.org... >>> JimL wrote: >>>> I'm looking at SVGA cable for an extension monitor. They show two >>>> similar cables, the only difference, including price, is that one has a >>>> ferrite beads, apparently at each end, and one doesn't. Why would I >>>> want >>>> ferrite beads or not want ferrite beads? >>>> >>>> Thanks >>>> >>> To prevent which would interference on your screen also to improve the >>> quality of the transmitted signal from the computer to your screen. >>> I would say get the one with the beads. >> >> I'm very curious about my second question. Why would I want a cable >> without >> the beads? That's another way of saying "why do they sell cables without >> the beads? And for the same price?" > > Cheaper quality doesn't always equate to cheaper price. > > Some cables have better shielding so using the beads to induce a reverse > signal to provide impedance to higher-frequency noise isn't needed > (because the noise didn't get induced into the signal wires inside the > better shielded cable in the first place). Better shielding tends to > make the cable stiffer. Ferrite beads allow use of a more flexible > cable because of less effective shielding. Ferrite beads are cheaper > than adding better shielding to the cable. > > http://en.wikipedia.org/wiki/Ferrite_bead > > With the 2 cables being the same price, I doubt the non-beaded cable has > adequate shielding. Heavy shielding costs a lot more than a couple > ferrite donuts on the ends. So get the beaded cable. Thanks -- For most of us the most danger is most politicians. JimL |