Anyone have experience with flectron shielding fabric
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Sometime mylar is only conductive on one side (usually the duller looking
side I think). A long thin wire is not considered an RF ground--although it will be good enough for any 60 Hz fields. Grounding straps are used... the frequency determines the needed width to length ratio of the strap. Bill On Mon, Sep 1, 2008 at 7:53 AM, jean <[hidden email]> wrote: > I read it somewhere, better to ground the aluminium shield. I don't > know where I read it maybe here. Cause otherwise it just shields one > side, if there are waves coming from the other side, it will reflect > it. > > The alligator clip, I have some doubt, the survival aluminium blanket > for example is very thin, so with an alligator clip don't know if > it's reliable. > > John > > > --- In [hidden email] <eSens%40yahoogroups.com>, "abailey63" > <abailey63@...> wrote: > > > > Interesting, not sure how "grounding" rf frequencies would work in > an > > electrical system (lower frequencies). I know that lessemf.com has > > pre-made grounding cords. I have no affiliation with this site and > you > > could probably make a grounding cord with an alligator clip > yourself. > > > > Where did you read about grounding for rf? I'd be interested in > > following up on that. > > > > Thanks, Alan > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "jean" <tdx244@> > wrote: > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno" > <wbruno@> wrote: > > > > > > > > If the dish has no power to it I wouldn't consider it a likely > > > problem. > > > > > > > > Restaurant supply places carry double width extra heavy duty > foil. > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > contact > > > > between them. > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > Bill > > > > > > Just a simple question I have : I read it is necessary to ground > the > > > aluminium foil. Then how to do it exactly. Cause again I'm very > > > ghetto. Using simple electric wire taped to the foil, well, it's > a > > > bit unstable cause the adhesive tape can loosen, and then the > > > connection is undone. So any simple advice about that ? > > > > > > John. > > > > > > > > [Non-text portions of this message have been removed] |
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In reply to this post by abailey63
On second thought, thanks, it could work better than just using
adhesive tape. One issue solved maybe ! John. --- In [hidden email], "abailey63" <abailey63@...> wrote: > > Interesting, not sure how "grounding" rf frequencies would work in an > electrical system (lower frequencies). I know that lessemf.com has > pre-made grounding cords. I have no affiliation with this site and you > could probably make a grounding cord with an alligator clip yourself. > > Where did you read about grounding for rf? I'd be interested in > following up on that. > > Thanks, Alan > > --- In [hidden email], "jean" <tdx244@> wrote: > > > > --- In [hidden email], "Bill Bruno" <wbruno@> wrote: > > > > > > If the dish has no power to it I wouldn't consider it a likely > > problem. > > > > > > Restaurant supply places carry double width extra heavy duty > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good contact > > > between them. > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > Bill > > > > Just a simple question I have : I read it is necessary to ground the > > aluminium foil. Then how to do it exactly. Cause again I'm very > > ghetto. Using simple electric wire taped to the foil, well, it's a > > bit unstable cause the adhesive tape can loosen, and then the > > connection is undone. So any simple advice about that ? > > > > John. > > > |
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In reply to this post by BiBrun
Thanks. Yes what Alan said about the alligator clip could work, if
seizing both side of the foil. I don't understand what you say about the length of the wire. My idea was just to connect the wire to the building ground. And yes it's for rf (phone masts waves) not for 60 hz electrical signal. Well, now that I'm reading that it's no use either, because of the longitudinal waves, the aluminium foil does not shield from. Problem not solved !! John. --- In [hidden email], "Bill Bruno" <wbruno@...> wrote: > > Sometime mylar is only conductive on one side (usually the duller looking > side I > think). > > A long thin wire is not considered an RF ground--although it will be > good enough for any 60 Hz fields. Grounding straps are used... > the frequency determines the needed width to length ratio of the strap. > > Bill > > On Mon, Sep 1, 2008 at 7:53 AM, jean <tdx244@...> wrote: > > > I read it somewhere, better to ground the aluminium shield. I don't > > know where I read it maybe here. Cause otherwise it just shields one > > side, if there are waves coming from the other side, it will reflect > > it. > > > > The alligator clip, I have some doubt, the survival aluminium blanket > > for example is very thin, so with an alligator clip don't know if > > it's reliable. > > > > John > > > > > > --- In [hidden email] <eSens% 40yahoogroups.com>, "abailey63" > > <abailey63@> wrote: > > > > > > Interesting, not sure how "grounding" rf frequencies would work in > > an > > > electrical system (lower frequencies). I know that lessemf.com has > > > pre-made grounding cords. I have no affiliation with this site and > > you > > > could probably make a grounding cord with an alligator clip > > yourself. > > > > > > Where did you read about grounding for rf? I'd be interested in > > > following up on that. > > > > > > Thanks, Alan > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "jean" > > wrote: > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno" > > <wbruno@> wrote: > > > > > > > > > > If the dish has no power to it I wouldn't consider it a likely > > > > problem. > > > > > > > > > > Restaurant supply places carry double width extra heavy duty > > foil. > > > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > > contact > > > > > between them. > > > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > > > Bill > > > > > > > > Just a simple question I have : I read it is necessary to > > the > > > > aluminium foil. Then how to do it exactly. Cause again I'm very > > > > ghetto. Using simple electric wire taped to the foil, well, it's > > a > > > > bit unstable cause the adhesive tape can loosen, and then the > > > > connection is undone. So any simple advice about that ? > > > > > > > > John. > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > |
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Long skinny wires have too much inductive impedance to carry RF.
That's why coax is used for cable tv etc. In fact the outer conductor of a coax cable might work much better than a skinny hook-up wire if you are trying to ground RF. Bill On Mon, Sep 1, 2008 at 9:46 AM, jean <[hidden email]> wrote: > Thanks. Yes what Alan said about the alligator clip could work, if > seizing both side of the foil. > > I don't understand what you say about the length of the wire. My > idea was just to connect the wire to the building ground. > > And yes it's for rf (phone masts waves) not for 60 hz electrical > signal. > > Well, now that I'm reading that it's no use either, because of the > longitudinal waves, the aluminium foil does not shield from. > > Problem not solved !! > > John. > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno" > <wbruno@...> wrote: > > > > Sometime mylar is only conductive on one side (usually the duller > looking > > side I > > think). > > > > A long thin wire is not considered an RF ground--although it will be > > good enough for any 60 Hz fields. Grounding straps are used... > > the frequency determines the needed width to length ratio of the > strap. > > > > Bill > > > > On Mon, Sep 1, 2008 at 7:53 AM, jean <tdx244@...> wrote: > > > > > I read it somewhere, better to ground the aluminium shield. I > don't > > > know where I read it maybe here. Cause otherwise it just shields > one > > > side, if there are waves coming from the other side, it will > reflect > > > it. > > > > > > The alligator clip, I have some doubt, the survival aluminium > blanket > > > for example is very thin, so with an alligator clip don't know if > > > it's reliable. > > > > > > John > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > 40yahoogroups.com>, "abailey63" > > > <abailey63@> wrote: > > > > > > > > Interesting, not sure how "grounding" rf frequencies would work > in > > > an > > > > electrical system (lower frequencies). I know that lessemf.com > has > > > > pre-made grounding cords. I have no affiliation with this site > and > > > you > > > > could probably make a grounding cord with an alligator clip > > > yourself. > > > > > > > > Where did you read about grounding for rf? I'd be interested in > > > > following up on that. > > > > > > > > Thanks, Alan > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > 40yahoogroups.com>, "jean" > <tdx244@> > > > wrote: > > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > 40yahoogroups.com>, "Bill > Bruno" > > > <wbruno@> wrote: > > > > > > > > > > > > If the dish has no power to it I wouldn't consider it a > likely > > > > > problem. > > > > > > > > > > > > Restaurant supply places carry double width extra heavy duty > > > foil. > > > > > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > > > contact > > > > > > between them. > > > > > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > > > > > Bill > > > > > > > > > > Just a simple question I have : I read it is necessary to > ground > > > the > > > > > aluminium foil. Then how to do it exactly. Cause again I'm > very > > > > > ghetto. Using simple electric wire taped to the foil, well, > it's > > > a > > > > > bit unstable cause the adhesive tape can loosen, and then the > > > > > connection is undone. So any simple advice about that ? > > > > > > > > > > John. > > > > > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > > > [Non-text portions of this message have been removed] |
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Okay, thanks much for this explanation. That's first time I hear
about that ! I'm a bit puzzled, never thought about that kind of stuff. But yes, it must make sense. Yes, it's all very doable. John. --- In [hidden email], "Bill Bruno" <wbruno@...> wrote: > > Long skinny wires have too much inductive impedance to carry RF. > That's why coax is used for cable tv etc. In fact the outer conductor > of a coax cable might work much better than a skinny hook-up wire > if you are trying to ground RF. > > Bill > > On Mon, Sep 1, 2008 at 9:46 AM, jean <tdx244@...> wrote: > > > Thanks. Yes what Alan said about the alligator clip could work, if > > seizing both side of the foil. > > > > I don't understand what you say about the length of the wire. My > > idea was just to connect the wire to the building ground. > > > > And yes it's for rf (phone masts waves) not for 60 hz electrical > > signal. > > > > Well, now that I'm reading that it's no use either, because of the > > longitudinal waves, the aluminium foil does not shield from. > > > > Problem not solved !! > > > > John. > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill > > <wbruno@> wrote: > > > > > > Sometime mylar is only conductive on one side (usually the duller > > looking > > > side I > > > think). > > > > > > A long thin wire is not considered an RF ground--although it will be > > > good enough for any 60 Hz fields. Grounding straps are used... > > > the frequency determines the needed width to length ratio of the > > strap. > > > > > > Bill > > > > > > On Mon, Sep 1, 2008 at 7:53 AM, jean <tdx244@> wrote: > > > > > > > I read it somewhere, better to ground the aluminium shield. I > > don't > > > > know where I read it maybe here. Cause otherwise it just > > one > > > > side, if there are waves coming from the other side, it will > > reflect > > > > it. > > > > > > > > The alligator clip, I have some doubt, the survival aluminium > > blanket > > > > for example is very thin, so with an alligator clip don't know if > > > > it's reliable. > > > > > > > > John > > > > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > > 40yahoogroups.com>, "abailey63" > > > > <abailey63@> wrote: > > > > > > > > > > Interesting, not sure how "grounding" rf frequencies would > > in > > > > an > > > > > electrical system (lower frequencies). I know that lessemf.com > > has > > > > > pre-made grounding cords. I have no affiliation with this site > > and > > > > you > > > > > could probably make a grounding cord with an alligator clip > > > > yourself. > > > > > > > > > > Where did you read about grounding for rf? I'd be interested in > > > > > following up on that. > > > > > > > > > > Thanks, Alan > > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > > 40yahoogroups.com>, "jean" > > <tdx244@> > > > > wrote: > > > > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com> <eSens% > > 40yahoogroups.com>, "Bill > > Bruno" > > > > <wbruno@> wrote: > > > > > > > > > > > > > > If the dish has no power to it I wouldn't consider it a > > likely > > > > > > problem. > > > > > > > > > > > > > > Restaurant supply places carry double width extra heavy duty > > > > foil. > > > > > > > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > > > > contact > > > > > > > between them. > > > > > > > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > > > > > > > Bill > > > > > > > > > > > > Just a simple question I have : I read it is necessary to > > ground > > > > the > > > > > > aluminium foil. Then how to do it exactly. Cause again I'm > > very > > > > > > ghetto. Using simple electric wire taped to the foil, well, > > it's > > > > a > > > > > > bit unstable cause the adhesive tape can loosen, and then the > > > > > > connection is undone. So any simple advice about that ? > > > > > > > > > > > > John. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > > > > > [Non-text portions of this message have been removed] > |
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In reply to this post by BiBrun
So what would an example rf ground look like. Clip? wire? What would
it be attached to send it to ground. Earth ground I assume? Thanks, Alan --- In [hidden email], "Bill Bruno" <wbruno@...> wrote: > > Sometime mylar is only conductive on one side (usually the duller looking > side I > think). > > A long thin wire is not considered an RF ground--although it will be > good enough for any 60 Hz fields. Grounding straps are used... > the frequency determines the needed width to length ratio of the strap. > > Bill > > On Mon, Sep 1, 2008 at 7:53 AM, jean <tdx244@...> wrote: > > > I read it somewhere, better to ground the aluminium shield. I don't > > know where I read it maybe here. Cause otherwise it just shields one > > side, if there are waves coming from the other side, it will reflect > > it. > > > > The alligator clip, I have some doubt, the survival aluminium blanket > > for example is very thin, so with an alligator clip don't know if > > it's reliable. > > > > John > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "abailey63" > > <abailey63@> wrote: > > > > > > Interesting, not sure how "grounding" rf frequencies would work in > > an > > > electrical system (lower frequencies). I know that lessemf.com has > > > pre-made grounding cords. I have no affiliation with this site and > > you > > > could probably make a grounding cord with an alligator clip > > yourself. > > > > > > Where did you read about grounding for rf? I'd be interested in > > > following up on that. > > > > > > Thanks, Alan > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "jean" > > wrote: > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill Bruno" > > <wbruno@> wrote: > > > > > > > > > > If the dish has no power to it I wouldn't consider it a likely > > > > problem. > > > > > > > > > > Restaurant supply places carry double width extra heavy duty > > foil. > > > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > > contact > > > > > between them. > > > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > > > Bill > > > > > > > > Just a simple question I have : I read it is necessary to ground > > the > > > > aluminium foil. Then how to do it exactly. Cause again I'm very > > > > ghetto. Using simple electric wire taped to the foil, well, it's > > a > > > > bit unstable cause the adhesive tape can loosen, and then the > > > > connection is undone. So any simple advice about that ? > > > > > > > > John. > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > |
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I found this site for ham radio grounding. Maybe it's a start to
understanding rf grounding. http://www.hamuniverse.com/grounding.html Thanks, Alan --- In [hidden email], "abailey63" <abailey63@...> wrote: > > So what would an example rf ground look like. Clip? wire? What would > it be attached to send it to ground. Earth ground I assume? > > Thanks, Alan > > --- In [hidden email], "Bill Bruno" <wbruno@> wrote: > > > > Sometime mylar is only conductive on one side (usually the duller > looking > > side I > > think). > > > > A long thin wire is not considered an RF ground--although it will be > > good enough for any 60 Hz fields. Grounding straps are used... > > the frequency determines the needed width to length ratio of the > > > > Bill > > > > On Mon, Sep 1, 2008 at 7:53 AM, jean <tdx244@> wrote: > > > > > I read it somewhere, better to ground the aluminium shield. I don't > > > know where I read it maybe here. Cause otherwise it just shields one > > > side, if there are waves coming from the other side, it will reflect > > > it. > > > > > > The alligator clip, I have some doubt, the survival aluminium blanket > > > for example is very thin, so with an alligator clip don't know if > > > it's reliable. > > > > > > John > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "abailey63" > > > <abailey63@> wrote: > > > > > > > > Interesting, not sure how "grounding" rf frequencies would work in > > > an > > > > electrical system (lower frequencies). I know that lessemf.com has > > > > pre-made grounding cords. I have no affiliation with this site and > > > you > > > > could probably make a grounding cord with an alligator clip > > > yourself. > > > > > > > > Where did you read about grounding for rf? I'd be interested in > > > > following up on that. > > > > > > > > Thanks, Alan > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "jean" > <tdx244@> > > > wrote: > > > > > > > > > > --- In [hidden email] <eSens%40yahoogroups.com>, "Bill > Bruno" > > > <wbruno@> wrote: > > > > > > > > > > > > If the dish has no power to it I wouldn't consider it a likely > > > > > problem. > > > > > > > > > > > > Restaurant supply places carry double width extra heavy duty > > > foil. > > > > > > > > > > > > Be sure to overlap the pieces by 3 or 4 inches, and get good > > > contact > > > > > > between them. > > > > > > > > > > > > Fly screen is what you put on windows to keep the bugs out. > > > > > > > > > > > > Bill > > > > > > > > > > Just a simple question I have : I read it is necessary to ground > > > the > > > > > aluminium foil. Then how to do it exactly. Cause again I'm very > > > > > ghetto. Using simple electric wire taped to the foil, well, it's > > > a > > > > > bit unstable cause the adhesive tape can loosen, and then the > > > > > connection is undone. So any simple advice about that ? > > > > > > > > > > John. > > > > > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > |
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In reply to this post by charles-4
Thanks to the group, I've come to look more precisely at the dishes
around, here's the result : - two satellite dishes on the roof (just above my appt), they are perfectly placed to reflect the beams from the next building phone mast towards my appartment, bedroom especially. - one more satellite dish at the same floor than me, my building is L shaped, it's also perfectly placed to reflect the phone mast beams towards my bedroom So I get the direct phone mast beams, plus the reflection from at least 3 dishes. Plus of course the dishes I have not noticed. Also dishes are only a part, there are other 'goodies' where I live. John. --- In [hidden email], "charles" <charles@...> wrote: > > Hello, > > I have found, that right at the back of a satellite dish, a concentrated > beam of logitudinal waves is coming out. > > Even from an unplugged dish. > > Shielding does not help, because those longitudinal waves pass right through > it. > > So be carefull, not to stay right behind one. > > Greetings, > Charles Claessens > member Verband Baubiologie > www.milieuziektes.nl > www.milieuziektes.be > www.hetbitje.nl > checked by Bitdefender > > > > ----- Original Message ----- > From: "Bill Bruno" <wbruno@...> > To: <[hidden email]> > Sent: Saturday, August 30, 2008 4:23 PM > Subject: Re: [eSens] Re: Anyone have experience with flectron > fabric/satellite dishes > > > >A small dish, when unplugged, is unlikely to have measurable > > effects except for microwaves above and in front of the dish. > > The larger older dishes could affect somewhat lower frequencies. > > They could also play a role in blocking solar/cosmic microwaves. > > > > There's not much of a focusing effect except at wavelengths > > shorter than the size of the dish, and the focal point is in > > front, not under. > > > > > > I really don't expect effects with the dish unplugged, but given > > how wrong scientists have been I won't say it's impossible. > |
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