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Stopping RFI from a PC

Discussion in 'Electronic Basics' started by W. Watson, Oct 18, 2005.

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  1. W. Watson

    W. Watson Guest

    For those interested in a view of the PSU that was defective, see
    <>. I'm sure the view is quite
    a bit like the one that is currently in the PC.

    For those wanting me to put a filter on the line, I bought a Radio Shack
    filter and tried it. No effect.

    As I mentioned in some other part of this thread, note that if I plug the
    other computer in the room to the same room outlet as the PC with the new
    PSU that causes the noise, it too causes the same noise. Either computer in
    the room will cause the same noise when plugged into the same outlet, not
    just the one I originally discovered was involved. That is, one might
    conclude that it is the outlet that is the source of the noise, and not the

    That's about as far as I'm going with this problem. It'll have to wait for
    another day.

    Wayne T. Watson (Watson Adventures, Prop., Nevada City, CA)
    (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
    Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

    "... astronomy is useful because it shows [not only] how small
    our bodies are, but how large our minds are." -- Henri Poincare

    Web Page: <>
  2. w_tom

    w_tom Guest

    Nothing in Radio Shack attached to that power cord can solve
    the RFI problem. Cheap filter on power cord was never
    properly recommended because it would accomplish nothing. To
    be effective, a 'power cord' filter would cost maybe $100.
    Effective filter must be power supply internal. The Radio
    Shack filter would not solve a problem created by a missing
    internal filter. Power supply internal filter is often
    'forgotten' when selling only on 'price and power' numbers.

    Meanwhile, a damning fact was from power supply vendor who
    said detailed and numerical specifications were not
    available. That implies a power supply will be missing
    essential functions - as demonstrated by RFI noise. How many
    other essential functions are also missing? That supply is
    more useful as a doorstop.

    The outlet is not a source of such noise. Some outlets are
    wired so to be better antennas. Any power supply that
    transmits RFI is defective internally. Some outlets simply
    will be better antennas for that RFI transmitter - a power
    supply designed to be sold only on price to bean counters.
  3. Jamie

    Jamie Guest

    nope, try using a UPS unit on one device like the Computer.
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