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In Reply to: Seasonic ATX SMPS posted by fmak on September 21, 2014 at 09:35:10:
Hi,
"long and stiff cables make excellent emitters"
1) Stiffness has no effect on the Aerial action of a cable.
2) Length must be seen in respect to the wavelength of the suspect signal. For most off mains SMPS 50 - 200KHz is the switching frequency so 6 - 1.5Km - next to which all cables attached to an ATX supply are VERY SHORT. Even if we allow the 50th harmonic of 200KHz we are still talking 30m wavelength. I doubt your ATX supply came with 30m cables.
3) In order to emit an electrical field it is recommended not to run any emitting aerial closely parallel with a ground/earth conductor. In most ATX power supplies ground and power cables are bundled together, if not twisted together (which would be better and less stiff BTW). I doubt the one you had was an exception.
4) In order to emit any signal, regardless of conductor length, presence of not of ground/earth conductors and (cough, cough) stiffness, there has to be a signal of appreciable magnitude to start with.
Thor
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?
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Follow Ups
- You have just received a ticket from the science police! - Thorsten 09:51:19 09/22/14 (3)
- RE: You have just received a ticket from the science police! - fmak 11:58:55 09/22/14 (2)
- RE: You have just received a ticket from the science police! - Tony Lauck 19:43:31 09/22/14 (1)
- modular power supply - fmak 21:47:12 09/22/14 (0)
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