---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 05/06/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:29 AM - Re: Twisted Pairs (Robert L. Nuckolls, III) 2. 06:00 AM - Re: Twisted Pairs (Robert L. Nuckolls, III) 3. 06:37 AM - Re: Twisted Pairs (Art Zemon) ________________________________ Message 1 _____________________________________ Time: 05:29:28 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Twisted Pairs At 09:49 PM 5/5/2016, you wrote: >Folks, > >Is there any reason to form the positive and negative power wires >for my devices into a twisted pair? Never seen it done. If you have a potentially vulnerable/antagonistic system signal/power line then installation instructions will call out special wiring techniques for maintaining electromagnetic Nirvana. Devices intended for use in electronically complex machines will have been evaluated for EMC issues as either victims or antagonists. It is the designers responsibility to fire-wall deleterious at the boundaries (connectors and enclosures) of their product. When we test electro-whizzies out in the RF laboratory, interconnecting wires that might also offer avenues of ingress/egress for RF energy are laid out for MAXIMUM vulnerability. When tested under such conditions, the product must demonstrate an ability to live harmoniously amongst other devices with no special attention on the part of the installer. Of course certain energy pathways are inherently vulnerable or antagonistic . . . those pathways will be identified and properly managed by shielded wires, coaxial cable or maybe even a fiber bundle (glass is already common in some home entertainment systems. You can replace all the cat-5 cables in your home network with glass right now see http://tinyurl.com/zt8hqgb ) But I don't see it coming to the panel of any small airplanes soon . . . it's simply too easy and less complex to run a few shielded wires between cooperating black boxes . . . and the instructions will tell you how to do it. Bob . . . ________________________________ Message 2 _____________________________________ Time: 06:00:22 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Twisted Pairs At 09:49 PM 5/5/2016, you wrote: >Folks, > >Is there any reason to form the positive and negative power wires >for my devices into a twisted pair? Never seen it done. If you have a potentially vulnerable/antagonistic system signal/power line then installation instructions will call out special wiring techniques for maintaining electromagnetic Nirvana. Devices intended for use in electronically complex machines will have been evaluated for EMC issues as either victims or antagonists. It is the designers responsibility to fire-wall deleterious at the boundaries (connectors and enclosures) of their product. When we test electro-whizzies out in the RF laboratory, interconnecting wires that might also offer avenues of ingress/egress for RF energy are laid out for MAXIMUM vulnerability. When tested under such conditions, the product must demonstrate an ability to live harmoniously amongst other devices with no special attention on the part of the installer. Of course certain energy pathways are inherently vulnerable or antagonistic . . . those pathways will be identified and properly managed by shielded wires, coaxial cable or maybe even a fiber bundle (glass is already common in some home entertainment systems. You can replace all the cat-5 cables in your home network with glass right now see http://tinyurl.com/zt8hqgb ) But I don't see it coming to the panel of any small airplanes soon . . . it's simply too easy and less complex to run a few shielded wires between cooperating black boxes . . . and the instructions will tell you how to do it. Bob . . . ________________________________ Message 3 _____________________________________ Time: 06:37:58 AM PST US Subject: Re: AeroElectric-List: Twisted Pairs From: Art Zemon On Fri, May 6, 2016 at 7:27 AM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > At 09:49 PM 5/5/2016, you wrote: > > Folks, > > Is there any reason to form the positive and negative power wires for my > devices into a twisted pair? > > > Never seen it done. If you have a potentially > vulnerable/antagonistic system signal/power line > then installation instructions will call out > special wiring techniques for maintaining > electromagnetic Nirvana. > > Devices intended for use in electronically > complex machines will have been evaluated > for EMC issues as either victims or antagonists. > It is the designers responsibility to > fire-wall deleterious at the boundaries > (connectors and enclosures) of their > product. > > When we test electro-whizzies out in the RF > laboratory, interconnecting wires that might > also offer avenues of ingress/egress for > RF energy are laid out for MAXIMUM vulnerability. > When tested under such conditions, the product > must demonstrate an ability to live harmoniously > amongst other devices with no special attention > on the part of the installer. > Very interesting! Thanks for explaining. > > You can > replace all the cat-5 cables in your home > network with glass right now see > http://tinyurl.com/zt8hqgb ) > Neat device but I probably won't... I'm lazy and replacing well functioning CAT-5 infrastructure is gonna happen right after I get around to dusting my stereo wires and changing my turn signal fluid.. :-) Cheers, -- Art Z. -- http://CheerfulCurmudgeon.com/ *"If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" 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