7149Re: HUM_FORUM: Re: Researcher asks: Anybody try to screen off the Hum with Faraday cage?
- Oct 2, 2006Patty, you are so right - this posting by Jaxz has made my heart sing - I have, personally, absolutely removed any idea that this "hum" is internal in any way. I don't, or can't, give any credence to anyone who implies that it is. So, to get this note from Jaxz - well, yes - it is encouraging.
Jerry - Florida Panhandle
At 09:26 AM 10/2/2006, you wrote:
Jaxz, Your expertise and accessibilty to sensitive equipment is very
encouraging. Prior messages 6467, 6481, 6496, and 6499 from Rossen/
Bulgaria and Jean/Canada deal with different chambers used in
exeriments in Germany.
(Message 6499 contains a link to the English translation of the German
Thanks for your work! Patty
--- In firstname.lastname@example.org, "andrewyassin" <jaxzjaxz@...> wrote:
> Hi all,
> I hear the hum and so does my wife. This is in south Lapland, North
> As a research physicist I have access to great instruments to attempt
> to solve this puzzle.
> I have read a lot about the hum, and actually done some very precise
> acoustic measurements. However, the results were that there was NO
> audible signal present at all, even though I could hear it loud and
> clear while measuring.
> I could measure down to 6Hz with very high sensitivity (20dB L-Eq;
> that is linear response over the entire spectrum - no filters) using a
> Bruel&Kjaer 2260 investigator.
> For infra-sound to be perceptible, very high signal levels are usually
> required; that is above ca 90dB L-Eq at 16Hz and increasing with
> decreasing sound frequency.
> This is a truly amasing piece of instrumentation - in Nort sweden it
> could pick up a concorde starting in Paris. However, no luck with
> Next week I'll do some vibrational studies as well using either a
> Geophone or an accelerometer. Such data might correlate to infra-sound
> loggings made by the IRF at www.irf.se (institute of space physics,
> Umea university). Possibly my hum might come from hydroelectric power
> plants. If so I'll surely be able to measure it.
> However, if the hum is of electromagnetic origin - it should be
> possible to screen off the perceived sound by creating a Faraday cage.
> Did anybody yet rule out that possibility?
> Please post if you tried to screen it off using a proper cage!
> Best regards,
This e-mail signature is my way of supporting KATHERINE HARRIS for U.S. Senate.
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