EMF shielding fabric questions re: decibel ratings

[pioneer]

let me establish i wouldn't know a decibel if it sat next to me on a bus.

let me establish i am going to purchase a piece of shielding fabric, and am looking at athe concept of creating an apron configuration in particular.

let me establish i've been looking and reading technical stuff i don't understand, but i have been able to determine that 65db rating or better is my goal in this protective shielding application.


question: can a db rating be doubled if the THICKNESS of the shielding fabric is doubled?

here's an example of something located this AM.http://www.lessemf.com/personal.html#216

if one were to purchase this apron looking item for a newly pregnant neice -who is concerned about her stay at home intensive computer job (up to 12 hrs a day)- to use which is rated 40db (or better), would attaching two of these together using velcro make for an 80db rated shield, thus achieving the desired minimum shielding goal of 65db?


question: if goal can be achieved by doubling, should we also be looking for some special type of thread as well for construction of this apron concept?

[Dogman]

Db is a measure of power and as the db level increases or decreases so the power level will change logarithmically.

But I think (thinky) that doubling the thickness of the shielding does in fact only double the protection linearity and not Log.



mbg!

[Horn]

Does she hardwire/Lan the connection to her machine, and disable/remove any wireless components?

Maybe more comfortable at least...

[Ponce]

Man oh man, what the hell are you guys talking about.....a "shielding" to protect your balls from radiation?, oh well, whatever.

V

[ShortJohnSilver]

It is good that she is thinking about it, however, here is what I would recommend if she is worrried about EMF:

1. Avoid using cell phone, which will transmit continuously; instead, get a traditional wired phone, or, a VOIP phone such as Cisco 7900 series. Plug it into the LAN (Ethernet) and don't run it over wireless. There is a device you can buy, where you pair your phone using Bluetooth to the device, then, you can plug in a regular wired phone and use the cell phone to make calls. So, buy this device, put it in another room, run the "silver strand" phone cable to the desk.

2. Use a desktop, place the desktop away from the body. Use wired LAN (Ethernet) instead of Wifi to connect to the Internet. Desktops are cheap, if you don't have one, check Craigslist for a decent one under $100 usually.
2a. Use wired keyboard and mouse, instead of wireless keyboard and mouse.

3. Aluminum foil is cheap and will work. Provided you don't block the airflow, wrapping the desktop case in thick Reynolds foil should stop any stray radiation (which is already less because you are using a desktop with a metal case).

4. turn off Wifi on the router when she is the only one at home. This is usually done via a button on the front, or, via a Web GUI interface on the router.

5. There is copper based paint, usually it is copper colored, that will block radiation signals. She could paint her walls in the home office with this kind of paint.

Finally, make sure everything is well-grounded. If needed, buy an 8' rod and pound it into the ground, or whatever (ask the local electrician) and connect the house ground to it.

[gunDriller]

question: can a db rating be doubled if the THICKNESS of the shielding fabric is doubled?

question: if goal can be achieved by doubling, should we also be looking for some special type of thread as well for construction of this apron concept?


No, that's not the way electromagnetic waves work. i.e. the shielding effectiveness does not double because you double the thickness of a conductive material. They are not converse and linear, as the question implies.

to be fully anal retentive - it is possible to design & make an apron design where the shielding effectiveness does double, when the apron thickness doubles. but that's sort of an academic point.


I once worked on a microwave company's 50 ohm loads. We used iron powder in castable 2 part epoxy. That is the kind of material to use if you want to absorb microwave energy.


Is this to protect the Gonads from electromagnetic energy etc. ?


If that works out for you, and you start a company to sell these things, can I have a corner office with a view ? :)

[pioneer]

thanks for the replies.

dogman--what does mgb! mean ?

horn--i don't know what else she is doing, she just asked me to find out about this decibles rating thing

ponce--my neice doesn't have balls

shortjohnsilver--those all sound like good suggestions, don't know that I could get her to take any of them, she's pretty focused on this apron idea.

about your drive a stake in the ground and connect the house ground to it suggestion, does that work for poor people who live in metal covered single-wide manufactured housing? does she need an electrician to do that for her, too?

gundriller--there are no gonads involved that we know of as she said the sex of the baby she's carrying is a girl.

[Dogman]

thanks for the replies.

dogman--what does mgb! mean ?

horn--i don't know what else she is doing, she just asked me to find out about this decibles rating thing

ponce--my neice doesn't have balls

shortjohnsilver--those all sound like good suggestions, don't know that I could get her to take any of them, she's pretty focused on this apron idea.

about your drive a stake in the ground and connect the house ground to it suggestion, does that work for poor people who live in metal covered single-wide manufactured housing? does she need an electrician to do that for her, too?

gundriller--there are no gonads involved that we know of as she said the sex of the baby she's carrying is a girl.

Mbg = My best guess!

All or should all house electrical drops from the pole should have a ground rod driven into the earth, with a copper wire from the breaker box to the rod.

That is the house electrical ground. Never hurts to drive more and electrically bond them together!

I have ground rods driven all over my place, being a ham radio op. Rf grounds and electrical all connected with flattened coax ground braid with clamps and gurneys (split bolt connector).

Emf shielding needs a earth ground, for max effect.

Mostly, unless close lighting strike, then all bets are off!

[Horn]

Go with shortjohnsilver's reply, and maybe combine Serpo's barefoot grounding mat for a reply to her.

I don't think doubling her layers will double her protection, long and short waves considered give her at most a 20% appreciation from doubling with layered protection.

Best to extend the transmitter & receiver further away from her to double the protection if using at all. Twice the distance, twice the better.

[Dogman]

Go with shortjohnsilver's reply, and maybe combine Serpo's barefoot grounding mat for a reply to her.

I don't think doubling her layers will double her protection, long and short waves considered give her at most a 20% appreciation from doubling with layered protection.

Best to extend the transmitter & receiver further away from her to double the protection if using at all. Twice the distance, twice the better.

Twice the distance = 4 times less!

Inverse square law!

[Cebu_4_2]

Twice the distance = 4 times less!

Inverse square law!

Pitchers please I don't understand the plane and square box thing.

[Dick_Stabber]

Some plastic on the floor for the splatter and no one will hear a thing

[vacuum]

An apron probably will do very little.

The two strategies I suggest is (1) avoiding emi sources as much as possible instead of trying to shield them, and (2) try to be more healthy overall by eating healthy foods, getting natural light, and exercising.

For avoidance, I would firstly, make sure all electronics are turned off and the cell phone is far away while sleeping. There is absolutely no reason to be exposing yourself to emi for 8 hours a day while your brain is repairing itself during sleep. Don't use a cell phone against your head, and don't keep it against your body. Let it sit on a table across the room, and if you need to make a call, use the speaker phone feature.

Try to avoid flourscent lights. Not only do they have mercury, but they do have high voltage ballasts which I imagine generate emi.

Try to use a desktop computer, and if possible keep it physically 10 feet away from the work desk. Just get a monitor extension cable and usb extension cables for the mouse and keyboard. If you want to buy here something, these extension cables are probably a good investment.

The goal here is to minimize TIME and QUANTITY of exposure. The shielding apron won't hurt, but it will do very little compared to minimizing the time and quantity of exposure. For shielding to be effective, you litterally need a completely sealed enclosure. Just one crack along one seam of this enclosure will reduce it from 80 dB of shielding down to like 10 dB.

The other thing to focus on is to increase the TIME and QUANTITY of exposure to healthy food, light, and physical activity. Organic foods are great, fresh foods are great, clean sources of non-flouridated, non-bottled water is great, natural sunlight, clean air, and a good amount of physical activity. All these things will offset the emi better than trying to shield it.

[Neuro]

I heard tinfoil hats may actually increase radiation to the brain in that it may help focus the EMF. [Argh!]

[pioneer]

vacuum, so according to you: EMF shielding "SILENT POCKET" fabric shield aimed primarily for the male consumer shirt and pants pocket usage (and apparently is demo'd as effective at Wi-Fi preventing signals getting to portable communication devices) that is bogus, sales gimmick and trickery?

have you personally subjected any of the EMF shielding fabric items, including the SILENT POCKET to any industry standard testing?

neuro, i don't believe my pregnant neice is considering wearing a suitable EMF shielding apron on her head. i could be wrong about that however.

anyone:
question: what IS the industry standard testing EMF testing device? is said device affordable? is it intuitive to learn to use?

[Neuro]

vacuum, so according to you: EMF shielding "SILENT POCKET" fabric shield aimed primarily for the male consumer shirt and pants pocket usage (and apparently is demo'd as effective at Wi-Fi preventing signals getting to portable communication devices) that is bogus, sales gimmick and trickery?

have you personally subjected any of the EMF shielding fabric items, including the SILENT POCKET to any industry standard testing?

neuro, i don't believe my pregnant neice is considering wearing a suitable EMF shielding apron on her head. i could be wrong about that however.

anyone:
question: what IS the industry standard testing EMF testing device? is said device affordable? is it intuitive to learn to use?
I think the main issue, vacuum is alluding to is that EMF's bounces around, thus wearing an apron on the front doesn't stop electro magnetic fields that much, the tinfoil hat example suggests you may even aid the back scatter radiation to get focused on the foetus if the apron is made of a reflective material and it lies over the rounded belly...

[steyr_m]

Pitchers please I don't understand the plane and square box thing.

Root mean squared...

I dunno. We are literally drowning in RF. Unless she lives in a Faraday Cage [as mentioned by the person stating the metallic-based paint] she is going to be exposed to it. an apron isn't going to help as the Cell Tower behind her is going to give exposure. Go to a public place -- 99% of people own a cell phone, more RF. Heck, even your power lines emit RF. Also as mentioned, if you double the distance from the emitter, you lessen the absorbed power by 4x

I say no WiFi or cell phones at home, esp since they emit microwaves. Use a desktop as you can extend the keyboard/mouse/video and better shielding.

Another thing to remember -- if there's an increase/decrease of 3db it is a doubling/halving of power.

[Horn]

I think the main issue, vacuum is alluding to is that EMF's bounces around, thus wearing an apron on the front doesn't stop electro magnetic fields that much, the tinfoil hat example suggests you may even aid the back scatter radiation to get focused on the foetus if the apron is made of a reflective material and it lies over the rounded belly...

I see, so the aluminum dome over the pregnant belly/brain could act as a receiver dish in the reverse...thus negating any protection?

Yes, tell her to get a Lan wire.

I'm not sure, on the standard wireless router do they allow you to disable the wireless portion and use only the wired?

I know they have a utility that allows you to focus it on the different 811 vs. N type stuff but can you disable it all together?

[steyr_m]

I'm not sure, on the standard wireless router do they allow you to disable the wireless portion and use only the wired?

I know they have a utility that allows you to focus it on the different 811 vs. N type stuff but can you disable it all together?

Just get a wired only router, after the baby is born, you don't want it sitting in RF either.

[gunDriller]

what IS the industry standard testing EMF testing device? is said device affordable? is it intuitive to learn to use?

an HP spectrum analyzer attached to a portable antenna (for sniffing RF)

an HP RF synthesizer (or competitor's equiv. product) and possibly amplifiers if you need to put RF into a device to see how it radiates.

i have only used the expensive kind (5 figures), but less expensive techniques are most likely available. just got to know the physics and build a test set-up.

[Serpo]

Earthing mat for feet and earthing mouse pad(I use one) will completely negate adverse affects of EMFs when stationed at a computer and keep a person feeling fresh ,energetic with very limited computer fatigue setting in.

The worse thing relating to EMFs are power plugs with out an earth (only two plugs) trifeild meter reads tremendous amounts of EMPs coming from these plugs,(something else to screw over the populace....getting rid of the earth on power leads.)

We also found that as soon as we are inside any building that we are surrounded by EMFs and they absorb into our bodies.

As soon as we step outside the door it all drops away.

Be earthed when sleeping also .

Thing babies love the most when mother is pregnant is the sun on the mothers belly(bare skin) really warms up little Joey inside .




https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTjVeJLc1PayHynkyHQx1bxLniJ4_qWD 3CrV77gfnOTIb7IMVC- 1600 × 1600 - ghost2ghost.org

(http://www.google.com.au/imgres?imgurl=http%3A%2F%2Fghost2ghost.org%2Fwp-content%2Fuploads%2F2014%2F03%2FTrifield-meter.jpg&imgrefurl=http%3A%2F%2Fghost2ghost.org%2Fpage%2F10 %2F&h=1600&w=1600&tbnid=wThRTEhqXI-FkM%3A&zoom=1&docid=0Nm97ijeKr5uVM&ei=6AzgU4CpO4qE8gW_6oGYDw&tbm=isch&client=firefox-a&ved=0CB8QMygCMAI&iact=rc&uact=3&dur=920&page=1&start=0&ndsp=10)

[Horn]

Don'tcha just hate fresh and energetic people? :)

[Serpo]

Don'tcha just hate fresh and energetic people? :)

Before I used this earthing thing the computer always seemed to drain your energy and make you tired ,now this is not the case .............

[Horn]

There's so much reinforced concrete around me, I'm like a darkhorse in faraday cage. :)


https://www.youtube.com/watch?v=0KSOMA3QBU0

[Neuro]

Before I used this earthing thing the computer always seemed to drain your energy and make you tired ,now this is not the case .............
You probably don't even need to drink coffee in the morning! Punk!