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#121
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Shielded mains cable
"Iain Churches" wrote in message
ti.fi "Arny Krueger" wrote in message ... "Eeyore" wrote in message Peter Wieck wrote: A shielded mains cable *might* be useful against heavy transients from equipment nearby, How ? *might* be useful against noise from switching power- supplies, *might* be useful against local rF sources (and if you discount this, you have never experienced CB interference from truckers with massive (and illegal) linear amps on their rigs). Operative word in all cases is *might*. It'll do nothing about the unscreened cable in the wall so will have effectively zero impact. This raises the question of why people are using screened power cables at all. I suspect they are trying to address very high frequency radiation which is also being reduced by the inductance and capacitance over the length of the power cable. This would explain why the shielding could be effective, even though its attached to possibly unshielded power wiring in the wall. Hi Arny. I am grateful to John Woodgate of the ISCE for the answer: "The screen may be intended to reduce emissions *from* the cable, rather than improving immunity. A Class D amplifier, is very likely to interfere with AM radio reception, yours or in adjacent houses. This happens even if the emission standard, EN 55013, (or EN 55103-1 for a professional product) is met, because the amplifier is quite close to the receiver." Can you see the correlation between John's answer and mine? |
#122
Posted to rec.audio.tubes
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Shielded mains cable
"Arny Krueger" wrote in message . .. Can you see the correlation between John's answer and mine? Apologies Arny. You have such a poor reputation in my own area of expertise, that, for some reason. I find it difficult to accept that you are any better in any other. John is a man I really trust:-)) Cordially Iain |
#123
Posted to rec.audio.tubes
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Shielded mains cable
"Sander deWaal" wrote in message ... Chris Hornbeck said: Clamp-on ferrite chokes are cheap insurance too. And not nearly as effective as real EMC measures inside the box. Clamp-on ferrites have the disadvantage of the necessary air gap, thereby reducing the effect. I use shielded mains cables on all things digital to prevent radiation *out*, not *in*. Yes. That seems to be the way it was intended in this case. |
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