Computer reacting with something else?

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richsurf77

Computer reacting with something else?

I'm faily sure that either my computer power supply or something else
in the desktop case, maybe the hard drive is causing me problems and
may well be what started me getting ES in the 1st place. But I'm
wondering if one of these things are maybe reacting to something else,
maybe even a fairly nearby mobile phone mast. Is it possible that my
computer is acting like some sort of antenna to phone signals? Anyway,
I can hear this strange noise sometimes, which is not the normal
humming this thing makes. But the 50-60Hz power supply is probably a
big problem :(

Anyway, that may well be a stupid theory, but I do think there's alot
of RF coming from this computer case and I read that aluminium foil
blocks RF and to test it, I wrapped it round a radio when it was
switched on and strangely, when I wrapped it around the aerial it did
not affect the reception at all, but when I placed it in front of the
radio in the direction of the nearest( and quite local) radio mast, it
did reduce the quality of the reception. But I don't understand why
wrapping it round the aerial had no affect.

Emil at Less EMF Inc

Re: Computer reacting with something else?

> I read that aluminium foil
> blocks RF and to test it, I wrapped it round a radio when it was
> switched on and strangely, when I wrapped it around the aerial it did
> not affect the reception at all, ... But I don't understand why
> wrapping it round the aerial had no affect.

Adding metal to the antenna simply makes the antenna bigger.

Emil

richsurf77

Re: Computer reacting with something else?

--- In [hidden email], "Less EMF Inc" <lessemf@...> wrote:
>
> > I read that aluminium foil
> > blocks RF and to test it, I wrapped it round a radio when it was
> > switched on and strangely, when I wrapped it around the aerial it
did
> > not affect the reception at all, ... But I don't understand why
> > wrapping it round the aerial had no affect.
>
> Adding metal to the antenna simply makes the antenna bigger.
>
> Emil
>

So if I tried it by wrappind plastic around the aerial and then
wrapping aluminium foil round that, would it work then or does there
have to be a fair gap between aerial and foil?

Emil at Less EMF Inc

Re: Computer reacting with something else?

>So if I tried it by wrappind plastic around the aerial and then
> wrapping aluminium foil round that, would it work then or does there
> have to be a fair gap between aerial and foil?

Yes, it would help. You should have a gap of at least near field dimensions
(1/6 wavelength).

Emil

rowster_c

Re: Computer reacting with something else?

Hi,

I couldn't tell if it was a battery driver radio or AC line radio.

If AC, the power cord acts as an aerial, and there is nothing
you can do about it. The radio signal jumps onto the power
cord and into the radio. If it is battery, wrap the whole
thing in alfoil TIGHTLY and it will not receive a signal.
I did this with a mobile phone (shielding tape to seal
the seam), but I had not figured on Emil's 1/6 wavelength
idea which might stymie the experiment.

Any device hooked up to another device will leak and
receive radiation via the mains or signal cable (such
as a mouse cable). You stop this via an expensive
filter. Mu metal is good to stop low frequency stuff, and
is the main port of call.

Shielding is an expensive and difficult business, requiring
fiber optics and money. This is why industry never gave us
the equipment we needed- its too expensive for them. What is your
livelihood to them? I see what you were doing: testing shielding.
Good stuff.

Providers involved:

amak Sweden (try www.amak.se)
lessemf
another US emf group doing 0 milligauss monitors- smart guys. First
onto hotspots I think.
MultiQ Sweden.
www.bemi.se : Klas Tegenfeldt used to make a monitor.

I think hush PCs Britain made fairly low emissions units.

The reason that EMI shielding is such a bloody nightmare
is the reason that electrosensitives are in such bloody trouble.

A way to fix this is to mainstream the EMF medicine connection
and throw the whole box and dice at this. So much has been learned.
So much is still to be learned.

All electrosensitives are justified in loudly asking for their
condition to be investigated. The first people I approached
were an EMC company- the best place to go. They were rude, and
it appeared that they overreacted to my suggestions. A year
or so later, their managing director was convicted of
corporate fraud. Twice. Nowadays, we have a few international EMC
groups giving fair attention and professionalism to our
subject.

All the best

Rowan.

--- In [hidden email], "Less EMF Inc" <lessemf@...> wrote:
>
> >So if I tried it by wrappind plastic around the aerial and then
> > wrapping aluminium foil round that, would it work then or does
there
> > have to be a fair gap between aerial and foil?
>
>
> Yes, it would help. You should have a gap of at least near field
dimensions
> (1/6 wavelength).
>
> Emil
>

BiBrun

Re: Computer reacting with something else?

I just learned something shielding a monitor.

It's a new LCD monitor, rated TCO'06, but still horrible RF emissions.

Covering it with some good shielding fabric from lessemf and attaching
a very short (about 5 inch) ground wire to a screw in my outlet hardly
helped at all at first.
However, I tried a few variations including switching to a shielded power
cord,
grounding to a hole I put in the monitor end of the power cord, and saw
improvements.
But the main cause of improvement seemed to be draping the fabric
differently so
it is not directly touching the screen (the fabric hangs down onto the desk.
Grounding seems not to matter (and a TCO screen does not put out much ELF
fields).

So it seems Emil's point about having some air space is really key.

It probably depends on the geometry and the details of the source--for
instance
I got good shielding to the sides of the monitor without any air space.

Bill

On 8/2/07, rowster_c <[hidden email]> wrote:

>
> Hi,
>
> I couldn't tell if it was a battery driver radio or AC line radio.
>
> If AC, the power cord acts as an aerial, and there is nothing
> you can do about it. The radio signal jumps onto the power
> cord and into the radio. If it is battery, wrap the whole
> thing in alfoil TIGHTLY and it will not receive a signal.
> I did this with a mobile phone (shielding tape to seal
> the seam), but I had not figured on Emil's 1/6 wavelength
> idea which might stymie the experiment.
>
> Any device hooked up to another device will leak and
> receive radiation via the mains or signal cable (such
> as a mouse cable). You stop this via an expensive
> filter. Mu metal is good to stop low frequency stuff, and
> is the main port of call.
>
> Shielding is an expensive and difficult business, requiring
> fiber optics and money. This is why industry never gave us
> the equipment we needed- its too expensive for them. What is your
> livelihood to them? I see what you were doing: testing shielding.
> Good stuff.
>
> Providers involved:
>
> amak Sweden (try www.amak.se)
> lessemf
> another US emf group doing 0 milligauss monitors- smart guys. First
> onto hotspots I think.
> MultiQ Sweden.
> www.bemi.se : Klas Tegenfeldt used to make a monitor.
>
> I think hush PCs Britain made fairly low emissions units.
>
> The reason that EMI shielding is such a bloody nightmare
> is the reason that electrosensitives are in such bloody trouble.
>
> A way to fix this is to mainstream the EMF medicine connection
> and throw the whole box and dice at this. So much has been learned.
> So much is still to be learned.
>
> All electrosensitives are justified in loudly asking for their
> condition to be investigated. The first people I approached
> were an EMC company- the best place to go. They were rude, and
> it appeared that they overreacted to my suggestions. A year
> or so later, their managing director was convicted of
> corporate fraud. Twice. Nowadays, we have a few international EMC
> groups giving fair attention and professionalism to our
> subject.
>
> All the best
>
> Rowan.
>
> --- In [hidden email] <eSens%40yahoogroups.com>, "Less EMF Inc"
> <lessemf@...> wrote:
> >
> > >So if I tried it by wrappind plastic around the aerial and then
> > > wrapping aluminium foil round that, would it work then or does
> there
> > > have to be a fair gap between aerial and foil?
> >
> >
> > Yes, it would help. You should have a gap of at least near field
> dimensions
> > (1/6 wavelength).
> >
> > Emil
> >
>
>
>

[Non-text portions of this message have been removed]

jaime_schunkewitz

Re: Computer reacting with something else?

--- In [hidden email], "Bill Bruno" <wbruno@...> wrote:
>
> I just learned something shielding a monitor.
>
> It's a new LCD monitor, rated TCO'06, but still horrible RF emissions.
>
> Covering it with some good shielding fabric from lessemf and attaching
> a very short (about 5 inch) ground wire to a screw in my outlet hardly
> helped at all at first.
> However, I tried a few variations including switching to a shielded
power
> cord,
> grounding to a hole I put in the monitor end of the power cord, and saw
> improvements.
> But the main cause of improvement seemed to be draping the fabric
> differently so
> it is not directly touching the screen (the fabric hangs down onto
the desk.
> Grounding seems not to matter (and a TCO screen does not put out
much ELF
> fields).
>
> So it seems Emil's point about having some air space is really key.
>
> It probably depends on the geometry and the details of the source--for
> instance
> I got good shielding to the sides of the monitor without any air space.
>
> Bill

So you covered the front of the LCD monitor?
How does it affect the visibility? Exactly
which fabric did you use?
Thanks,
Eli

BiBrun

Re: Computer reacting with something else?

What I have now is "silver high performance"
http://lessemf.com/fabric.html#1222

but I would probably recommend instead using "veil shield" which I had on a
previous monitor
http://lessemf.com/fabric.html#1270

which is even more transparent (the latter is black but very fine, the first
one is a rather pretty bronze color).

If the screen is dark compared to ambient light visibility could be
an problem, but I think for most situations it will be fine. With the
bronze one
it looks like a shiny nylon stocking material, and it looks like it's not
that
transparent, but it's really no problem, at least if you keep your distance
from the screen and use a large font. The veil shield is like turning down
the
brightness of the monitor a few notches.

Bill

On 8/3/07, jaime_schunkewitz <[hidden email]> wrote:

>
> --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno"
> <wbruno@...> wrote:
> >
> > I just learned something shielding a monitor.
> >
> > It's a new LCD monitor, rated TCO'06, but still horrible RF emissions.
> >
> > Covering it with some good shielding fabric from lessemf and attaching
> > a very short (about 5 inch) ground wire to a screw in my outlet hardly
> > helped at all at first.
> > However, I tried a few variations including switching to a shielded
> power
> > cord,
> > grounding to a hole I put in the monitor end of the power cord, and saw
> > improvements.
> > But the main cause of improvement seemed to be draping the fabric
> > differently so
> > it is not directly touching the screen (the fabric hangs down onto
> the desk.
> > Grounding seems not to matter (and a TCO screen does not put out
> much ELF
> > fields).
> >
> > So it seems Emil's point about having some air space is really key.
> >
> > It probably depends on the geometry and the details of the source--for
> > instance
> > I got good shielding to the sides of the monitor without any air space.
> >
> > Bill
>
> So you covered the front of the LCD monitor?
> How does it affect the visibility? Exactly
> which fabric did you use?
> Thanks,
> Eli
>
>
>

[Non-text portions of this message have been removed]

richsurf77

Re: Computer reacting with something else?

In reply to this post by rowster_c

I tried holding a MW radio and moving it round the room where my
computer is when it was all switched on, because I'm not totally sure
if the problem may be the wiring in that room or a part of the
computer itself. I tried it once before, but I didn't realise you
need to use MW to test it, so I used FM and there wasn't very much
interference. Anyway, there was hardly any interference in most of
the room, but when I moved the radion next to and just above the
flatscreen monitor, there was loads of interference and screeching
noise from the radio. I'm not sure yet if all monitors would have
this effect, but I gues they probably do. But I was surprised because
the interference was not much near the cables connected to the
monitor, or any other cables, but it seems to all be coming from the
monitor itself. I don't really understand these things so does anyone
know why the monitor is producing so much? Is it something to do with
the backlighting in it?

However, despite all the RF it's giving off, I'm not totally sure the
monitor is the problem, because it feels more like it's the case with
all the components in that is causing the problems, maybe because of
the power supply or hard drive. The reasom I think this is because I
can hear this high pitched noise while it is on. Maybe it's RF at a
different frequency which doesn't cause interference on the radio.

And I can also feel something in the room where the computer is
after it has been switched off for a while, so it's probably still
giving off something.

Richard

--- In [hidden email], "rowster_c" <rowanc@...> wrote:

jaime_schunkewitz

Re: Computer reacting with something else?

--- In [hidden email], "richsurf77" <richgrav@...> wrote:

>
> I tried holding a MW radio and moving it round the room where my
> computer is when it was all switched on, because I'm not totally sure
> if the problem may be the wiring in that room or a part of the
> computer itself. I tried it once before, but I didn't realise you
> need to use MW to test it, so I used FM and there wasn't very much
> interference. Anyway, there was hardly any interference in most of
> the room, but when I moved the radion next to and just above the
> flatscreen monitor, there was loads of interference and screeching
> noise from the radio. I'm not sure yet if all monitors would have
> this effect, but I gues they probably do. But I was surprised because
> the interference was not much near the cables connected to the
> monitor, or any other cables, but it seems to all be coming from the
> monitor itself. I don't really understand these things so does anyone
> know why the monitor is producing so much? Is it something to do with
> the backlighting in it?
>
> However, despite all the RF it's giving off, I'm not totally sure the
> monitor is the problem, because it feels more like it's the case with
> all the components in that is causing the problems, maybe because of
> the power supply or hard drive. The reasom I think this is because I
> can hear this high pitched noise while it is on. Maybe it's RF at a
> different frequency which doesn't cause interference on the radio.
>
> And I can also feel something in the room where the computer is
> after it has been switched off for a while, so it's probably still
> giving off something.
>
> Richard
>

To the best of my knowledge it's not the
fluorescent backlight that's causing the RF
emissions that your describing. My LCD monitor has
an LED backlight yet still emits RF noise. My RF
meter does not measure anything, yet a MW radio picks
up the noise over a foot away. I'm sure that's what's
causing my tinnitus. In fact, there isn't event a power
supply in my LCD and the RF noise is there. Therefore
I conclude that the RF noise is eminating from
the LCD driver circuit board, and the correspoinding
wire matrix. My tinnitus was alleviated
after shieding that circuit board, all the
more supporting that theory. There's one more possible source
of the noise, and that is the dirty power supply. The
DC sources (12v, 5v) from the LCD power supply have
250 milivolt spikes. At something like 20k hz.
Don't get me wrong. My monitor is much, much more
tolerable without the power supply. It no longer causes
chest pains and my tinnitus is alleviated, but
it's still annoying. I recently ordered that
fabric from lessemf. We'll see if that helps. If
not I may have to build my own power supply. Or
give up and become an organic farmer. The
latter is more realistic as time goes by for this
ES sufferer. As for the computer, some are more
tolerable than others. Get it as far from you as
possible.
Eli
www.ahappyhabitat.com

Marc Martin

Re: Computer reacting with something else?

Administrator

> As for the computer, some are more
> tolerable than others. Get it as far from you as
> possible.

Yes, and this applies to the monitor as well. I've
been using my new 26" Sony Bravia LCD monitor for
a few weeks now, and am doing well with it. I am
using many EMF devices with it (Furman noise reducing
power strip, Quantum Products power conditioner,
Quantum Companion, Quantum Byte, Springlife
Lifeforce pendant, RA*D*AR card), but previously
I never found a way to tolerate LCD monitors
even with devices! I think the key here is
that the monitor is all the way back at the rear
of my desk, so there is a good 3 feet between
the monitor and my face.

Marc

charles-4

Re: Computer reacting with something else?

With the Esmog Spion or the VLF Detector, one can easily detect which LCD
gives less or more radiation.
(See *het bitje* issue May 2006, english version)

The frequencies involved are mostly around 30 kHz.

That way I choose for a Philips 42", although my wife hates the black shiny
outside of the screen.
Be also aware for image-steering signals, which may occur with a satellite
receiver when menus are on the screen.

I also found that plasma TVs give more disturbing signals than LCD.

Last week I found a huge Panasonic, which gave signals nobody liked.

Greetings,
Charles Claessens
member Verband Baubiologie
www.milieuziektes.nl
www.milieuziektes.be
www.hetbitje.nl
checked by Bitdefender

----- Original Message -----
From: "Marc Martin" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, August 12, 2007 17:09
Subject: Re: [eSens] Re: Computer reacting with something else?

> > As for the computer, some are more
>> tolerable than others. Get it as far from you as
>> possible.
>
> Yes, and this applies to the monitor as well. I've
> been using my new 26" Sony Bravia LCD monitor for
> a few weeks now, and am doing well with it. I am
> using many EMF devices with it (Furman noise reducing
> power strip, Quantum Products power conditioner,
> Quantum Companion, Quantum Byte, Springlife
> Lifeforce pendant, RA*D*AR card), but previously
> I never found a way to tolerate LCD monitors
> even with devices! I think the key here is
> that the monitor is all the way back at the rear
> of my desk, so there is a good 3 feet between
> the monitor and my face.
>
> Marc
>
>
>
> Yahoo! Groups Links
>
>
>
>

Marc Martin

Re: plasma TVs versus LCD TVs

Administrator

> I also found that plasma TVs give more disturbing signals than LCD.

Yes, I've noticed that in stores which sell televisions. I've had
an almost immediate bad reaction to plasma TVs, while with LCD TVs
the bad reaction takes longer.

It's a pity, because to my eyes, plasma TVs have a better quality
picture than LCD TVs.

Oh well, there are other TV display technologies that may come out
in the next few years. OLED and SED being the most interesting
to me... (and I'm still using a CRT for TV at home)

Marc

BiBrun

Re: Computer reacting with something else?

In reply to this post by charles-4

Can someone tell me what a MW radio is? Is that a satellite radio?
(I have a portable short-wave receiver).

I do think the backlights are noisy but I checked an LED backlight model and
it was just as bad, so yes other electronics are a problem too.

Eli, can you say more about how you shielded the circuit board?

I have wrapped a power strip with a couple power supplies using Giron
fabric (available at LessEMF).
Certainly reduces the magnetic field. I have about 2 feet (0.6 meter?) of
that fabric and just bent it
into a tube shape and put the stuff inside the tube.

Bill
On 8/12/07, charles <[hidden email]> wrote:

>
> With the Esmog Spion or the VLF Detector, one can easily detect which
> LCD
> gives less or more radiation.
> (See *het bitje* issue May 2006, english version)
>
> The frequencies involved are mostly around 30 kHz.
>
> That way I choose for a Philips 42", although my wife hates the black
> shiny
> outside of the screen.
> Be also aware for image-steering signals, which may occur with a satellite
>
> receiver when menus are on the screen.
>
> I also found that plasma TVs give more disturbing signals than LCD.
>
> Last week I found a huge Panasonic, which gave signals nobody liked.
>
> Greetings,
> Charles Claessens
> member Verband Baubiologie
> www.milieuziektes.nl
> www.milieuziektes.be
> www.hetbitje.nl
> checked by Bitdefender
>
> ----- Original Message -----
> From: "Marc Martin" <[hidden email] <marc%40ufoseries.com>>
> To: <[hidden email] <eSens%40yahoogroups.com>>
> Sent: Sunday, August 12, 2007 17:09
> Subject: Re: [eSens] Re: Computer reacting with something else?
>
> > > As for the computer, some are more
> >> tolerable than others. Get it as far from you as
> >> possible.
> >
> > Yes, and this applies to the monitor as well. I've
> > been using my new 26" Sony Bravia LCD monitor for
> > a few weeks now, and am doing well with it. I am
> > using many EMF devices with it (Furman noise reducing
> > power strip, Quantum Products power conditioner,
> > Quantum Companion, Quantum Byte, Springlife
> > Lifeforce pendant, RA*D*AR card), but previously
> > I never found a way to tolerate LCD monitors
> > even with devices! I think the key here is
> > that the monitor is all the way back at the rear
> > of my desk, so there is a good 3 feet between
> > the monitor and my face.
> >
> > Marc
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>

[Non-text portions of this message have been removed]

pete robinson

Re: Computer reacting with something else?

its a radio that sings you to sleep...
i use it when my gfirend annoys me
On 12 Aug 2007, at 21:37, Bill Bruno wrote:

> Can someone tell me what a MW radio is? Is that a satellite radio?
> (I have a portable short-wave receiver).
>
> I do think the backlights are noisy but I checked an LED backlight
> model and
> it was just as bad, so yes other electronics are a problem too.
>
> Eli, can you say more about how you shielded the circuit board?
>
> I have wrapped a power strip with a couple power supplies using Giron
> fabric (available at LessEMF).
> Certainly reduces the magnetic field. I have about 2 feet (0.6
> meter?) of
> that fabric and just bent it
> into a tube shape and put the stuff inside the tube.
>
> Bill
> On 8/12/07, charles <[hidden email]> wrote:
> >
> > With the Esmog Spion or the VLF Detector, one can easily detect
> which
> > LCD
> > gives less or more radiation.
> > (See *het bitje* issue May 2006, english version)
> >
> > The frequencies involved are mostly around 30 kHz.
> >
> > That way I choose for a Philips 42", although my wife hates the
> black
> > shiny
> > outside of the screen.
> > Be also aware for image-steering signals, which may occur with a
> satellite
> >
> > receiver when menus are on the screen.
> >
> > I also found that plasma TVs give more disturbing signals than LCD.
> >
> > Last week I found a huge Panasonic, which gave signals nobody liked.
> >
> > Greetings,
> > Charles Claessens
> > member Verband Baubiologie
> > www.milieuziektes.nl
> > www.milieuziektes.be
> > www.hetbitje.nl
> > checked by Bitdefender
> >
> > ----- Original Message -----
> > From: "Marc Martin" <[hidden email] <marc%40ufoseries.com>>
> > To: <[hidden email] <eSens%40yahoogroups.com>>
> > Sent: Sunday, August 12, 2007 17:09
> > Subject: Re: [eSens] Re: Computer reacting with something else?
> >
> > > > As for the computer, some are more
> > >> tolerable than others. Get it as far from you as
> > >> possible.
> > >
> > > Yes, and this applies to the monitor as well. I've
> > > been using my new 26" Sony Bravia LCD monitor for
> > > a few weeks now, and am doing well with it. I am
> > > using many EMF devices with it (Furman noise reducing
> > > power strip, Quantum Products power conditioner,
> > > Quantum Companion, Quantum Byte, Springlife
> > > Lifeforce pendant, RA*D*AR card), but previously
> > > I never found a way to tolerate LCD monitors
> > > even with devices! I think the key here is
> > > that the monitor is all the way back at the rear
> > > of my desk, so there is a good 3 feet between
> > > the monitor and my face.
> > >
> > > Marc
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>

[Non-text portions of this message have been removed]

jaime_schunkewitz

Re: Computer reacting with something else?

In reply to this post by BiBrun

> Can someone tell me what a MW radio is? Is that a satellite radio?
> (I have a portable short-wave receiver).

My interpretation is a portable short wave radio.

> I do think the backlights are noisy but I checked an LED backlight
model and
> it was just as bad, so yes other electronics are a problem too.

No doubt fluorescent backlights are noisy, but
not as noisy as the power supply and other electronics
in the monitor. If you take apart a newer model LCD monitor
you'll observe more metalic insulation around the bulbs
than the older models. The engineers know they're
burning us up.

I know a fellow that used to design Wyse terminals. Way back
then they knew that some people got headaches from them. So
they tweaked the frequencies a bit.

> Eli, can you say more about how you shielded the circuit board?

I took the monitor apart, then wrapped the entire circuit board
with mu metal (in a circular shape). I was getting a terrible low
frequency tinnitus tone that I refer to as "the death tone". After
shielding that tone disapeared. Now I get a "cricket" or "fuzzy"
type of tinnitus.

It kills me that half or more of all Americans suffer from tinnitus,
yet they don't know the cause is EMF from their TVs, computers,
and cell phones... lunacy rules.

>
> I have wrapped a power strip with a couple power supplies using Giron
> fabric (available at LessEMF).
Certainly reduces the magnetic field. I have about 2 feet (0.6
meter?) of
> that fabric and just bent it
> into a tube shape and put the stuff inside the tube.

Mu metal will probably be more effective. It shields
very low as well as higher frequencies.

Eli

BiBrun

Re: Computer reacting with something else?

This Giron fabric acts a lot like mu metal. It is very thick and
is really more like heavy cardboard with layers of duct tape than fabric.
But it can't cut you like mu metal. It's too hard to bend for use inside a
monitor though.
Bill

On 8/12/07, jaime_schunkewitz <[hidden email]> wrote:

>
> > Can someone tell me what a MW radio is? Is that a satellite radio?
> > (I have a portable short-wave receiver).
>
> My interpretation is a portable short wave radio.
>
> > I do think the backlights are noisy but I checked an LED backlight
> model and
> > it was just as bad, so yes other electronics are a problem too.
>
> No doubt fluorescent backlights are noisy, but
> not as noisy as the power supply and other electronics
> in the monitor. If you take apart a newer model LCD monitor
> you'll observe more metalic insulation around the bulbs
> than the older models. The engineers know they're
> burning us up.
>
> I know a fellow that used to design Wyse terminals. Way back
> then they knew that some people got headaches from them. So
> they tweaked the frequencies a bit.
>
> > Eli, can you say more about how you shielded the circuit board?
>
> I took the monitor apart, then wrapped the entire circuit board
> with mu metal (in a circular shape). I was getting a terrible low
> frequency tinnitus tone that I refer to as "the death tone". After
> shielding that tone disapeared. Now I get a "cricket" or "fuzzy"
> type of tinnitus.
>
> It kills me that half or more of all Americans suffer from tinnitus,
> yet they don't know the cause is EMF from their TVs, computers,
> and cell phones... lunacy rules.
>
> >
> > I have wrapped a power strip with a couple power supplies using Giron
> > fabric (available at LessEMF).
> Certainly reduces the magnetic field. I have about 2 feet (0.6
> meter?) of
> > that fabric and just bent it
> > into a tube shape and put the stuff inside the tube.
>
> Mu metal will probably be more effective. It shields
> very low as well as higher frequencies.
>
> Eli
>
>
>

[Non-text portions of this message have been removed]

skrzn

Re: Computer reacting with something else?

In reply to this post by BiBrun

MW = Medium Wave = Medium frequency, it's used for what was the
common radio receiver called AM radio in N.America.
They use the frequency range from 540 kHz to 1,600 kHz.

Short wave is higher frequency.

William

--- In [hidden email], "Bill Bruno" <wbruno@...> wrote:
>
> Can someone tell me what a MW radio is? Is that a satellite radio?
> (I have a portable short-wave receiver).
>

rowster_c

Re: Computer reacting with something else?

In reply to this post by jaime_schunkewitz

--- In [hidden email],
"jaime_schunkewitz" <jaime_schunkewitz@...> wrote:

> In fact, there isn't event a power
> supply in my LCD and the RF noise is there. Therefore
> I conclude that the RF noise is eminating from
> the LCD driver circuit board, and the correspoinding
> wire matrix.

My new 2nd hand compaq 12 Volt DVI monitor is in pieces on the bench.
Those picture wires look hard to shield and would sureley act
as perfect antennas. (I broke the last monitor I
dismantled!) You can apply a rectangular
mesh of stainless steel across the front of the monitor and
bond it with copper tape to the internal metal housing. I have some I
could send you if you want to pay postage, it should go cheaply
in a flat envelope about $15. Professional companies use ultrafine
good visibility mesh, mine is average, you want at least 100
openings per inch. I am about to get some better stuff from
Holland. Mesh fabric is ok
for vision, but you will get more low frequency and better
visibility with mesh. I built a laptop fabric and tape enclosure with
the fabrics and didn't get enough effect, but there the laptop was
too close, and not enough mu metal (I use some metglass, of which
Giron is a variant I think).

> There's one more possible source
> of the noise, and that is the dirty power supply. The
> DC sources (12v, 5v) from the LCD power supply have
> 250 milivolt spikes. At something like 20k hz.

Tinnitus sounds like a case of microwave hearing.
I am interested in the power supply that is remoted, and
can't tell if you are saying its fixed. I take it you cut out
the board with the inverters from the monitor and put it
on an extension lead, and it gives out a 12 V and a 5 V line.

If so, maybe try a 12V car battery and a charger to charge it
every 6 hours, and a battery solution for the 5 V. I have not
worked out
how to do that, you may try 4.8 V (4 x 1.2 V AA rechargeable
batteries) or a 6 V battery and see if the 5 V line can
tolerate either without blowing up. As a test, you might obtain
a high quality benchtop power supply with 2 channels. These have
some noise but I think at a higher frequency. If you spend a bit
you can probably get a 15 year old linear high quality 2 channel
supply
on ebay from say Hewlett Packard, and place it 5 metres away. Then
if your meters tell you the power is clean ish you could check
the effect.

This experiment is very heartening, I should apologise to the
group for some bad language a while ago, I was tired and emotional.

Rowan C

Ian Kemp

Re: Computer reacting with something else?

In reply to this post by BiBrun

Once upon a time in the good old days of AM (amplitude moderated) radio, MW
simply stood for medium wave - but I'm assuming it's not that :-) Too many
abbreviations!
Ian

_____

From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill
Bruno
Sent: 12 August 2007 21:38
To: [hidden email]
Subject: Re: [eSens] Re: Computer reacting with something else?

Can someone tell me what a MW radio is? Is that a satellite radio?
(I have a portable short-wave receiver).

I do think the backlights are noisy but I checked an LED backlight model and
it was just as bad, so yes other electronics are a problem too.

Eli, can you say more about how you shielded the circuit board?

I have wrapped a power strip with a couple power supplies using Giron
fabric (available at LessEMF).
Certainly reduces the magnetic field. I have about 2 feet (0.6 meter?) of
that fabric and just bent it
into a tube shape and put the stuff inside the tube.

Bill
On 8/12/07, charles <charles@milieuziekt <mailto:charles%40milieuziektes.be>
es.be> wrote:

<marc%40ufoseries.com>>
> To: <eSens@yahoogroups. <mailto:eSens%40yahoogroups.com> com
<eSens%40yahoogroups.com>>

> Sent: Sunday, August 12, 2007 17:09
> Subject: Re: [eSens] Re: Computer reacting with something else?
>
> > > As for the computer, some are more
> >> tolerable than others. Get it as far from you as
> >> possible.
> >
> > Yes, and this applies to the monitor as well. I've
> > been using my new 26" Sony Bravia LCD monitor for
> > a few weeks now, and am doing well with it. I am
> > using many EMF devices with it (Furman noise reducing
> > power strip, Quantum Products power conditioner,
> > Quantum Companion, Quantum Byte, Springlife
> > Lifeforce pendant, RA*D*AR card), but previously
> > I never found a way to tolerate LCD monitors
> > even with devices! I think the key here is
> > that the monitor is all the way back at the rear
> > of my desk, so there is a good 3 feet between
> > the monitor and my face.
> >
> > Marc
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>

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