Hello all!
Speaking of home diathermy,it's actually a 50 year old product. at one time
(1950-1955) I worked for a medical repair service and was asked to repair
several Home diathermy machines manufactured in phoenix AZ.. I understand
it didn't sell well and they soon went out of business, it seems that too
many people were injured by the product..
Recently ran across a book describing a GE product, an inductive heater to
replace the house hold oil heater. It was was advertised as being able to
heat all the rooms of your home with " the modern miracle of Radio
energy"!!!!!
God save us from eager beaver product designers / promoters.
Dan KC7VDA
On Thu, Dec 5, 2013 at 10:00 AM, <rfi-request@contesting.com> wrote:
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> Today's Topics:
>
> 1. Adding a shield to the utility service lines? (Aaron Kreider)
> 2. Re: Adding a shield to the utility service lines? (Jim Brown)
> 3. Re: Adding a shield to the utility service lines? (David Cole)
> 4. DANGER WILL ROBINSON!!!!! (David Robbins)
> 5. Re: DANGER WILL ROBINSON!!!!! (EDWARDS, EDDIE J)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 05 Dec 2013 00:33:18 -0500
> From: Aaron Kreider <aaron@campusactivism.org>
> To: rfi@contesting.com
> Subject: [RFI] Adding a shield to the utility service lines?
> Message-ID: <52A0101E.2080905@campusactivism.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Have you ever heard of a shielding product that would clamp on to
> existing utility service lines? I'm interested in shielding the service
> lines from PECO that run in a T shape on my small city lot. Ideally
> there would be EMT that could clamp on to them, like how the hot water
> copper pipe insulation works.
>
> I guess I could cut emt into half and then fit them back together. It'd
> need to be fairly light.
>
> Another crazy option is to use a metal conducting paint and paint the
> power lines. There are paints designed for RFI shielding. I could
> spray them, but it'd be hard to get full coverage.
>
> This might be a crazy idea, but it is more likely to work than me
> putting up $200 of ferrites on the power lines - as I don't have any
> slack in them and would have to use the monster choke clamps. The
> ferrites might help a bit, but possibly only 1-2 db - whereas with a
> better shield I should get a 10+ db reduction.
>
> The downside is that I'd need some 20 foot step ladders to do this,
> whereas with the ferrites I can just place them at two points (on both
> sides of my property).
>
> I could track down the noise sources in my neighborhood. But there are a
> lot of them, and with a high turnover of renters every year - it'd be an
> endless fight.
>
> Aaron
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 04 Dec 2013 21:45:38 -0800
> From: Jim Brown <jim@audiosystemsgroup.com>
> To: rfi@contesting.com
> Subject: Re: [RFI] Adding a shield to the utility service lines?
> Message-ID: <52A01302.4070203@audiosystemsgroup.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 12/4/2013 9:33 PM, Aaron Kreider wrote:
> > Another crazy option
>
> Yes, it is. Shielding addresses differential mode RFI, and most trash
> on power lines is a common mode signal and radiates just like any other
> antenna. Although I tried a bunch of big clamp-ons on a twisted triad
> power feed back in Chicago, it was long before I understood how ferrite
> chokes work, and I'm now nearly convinced that it was a bad idea because
> a string of beads is inductive.
>
> Even if you could shield that line (it belongs to the power company, so
> it's not a good idea), the common mode current would flow on that
> shield, and you would still need to choke it to prevent it from radiating.
>
> 73, Jim K9YC
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 04 Dec 2013 21:52:19 -0800
> From: David Cole <dave@nk7z.net>
> To: rfi@contesting.com
> Subject: Re: [RFI] Adding a shield to the utility service lines?
> Message-ID: <1386222739.10880.33.camel@strangelove.nk7z>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi,
>
> Be careful... This sounds like something I might read in the Darwin
> Awards...
>
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
> for MixW support see;
> http://groups.yahoo.com/neo/groups/mixw/info
> for Dopplergram information see:
> http://groups.yahoo.com/neo/groups/dopplergram/info
> for MM-SSTV see:
> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>
>
>
> On Thu, 2013-12-05 at 00:33 -0500, Aaron Kreider wrote:
> > Have you ever heard of a shielding product that would clamp on to
> > existing utility service lines? I'm interested in shielding the service
> > lines from PECO that run in a T shape on my small city lot. Ideally
> > there would be EMT that could clamp on to them, like how the hot water
> > copper pipe insulation works.
> >
> > I guess I could cut emt into half and then fit them back together. It'd
> > need to be fairly light.
> >
> > Another crazy option is to use a metal conducting paint and paint the
> > power lines. There are paints designed for RFI shielding. I could
> > spray them, but it'd be hard to get full coverage.
> >
> > This might be a crazy idea, but it is more likely to work than me
> > putting up $200 of ferrites on the power lines - as I don't have any
> > slack in them and would have to use the monster choke clamps. The
> > ferrites might help a bit, but possibly only 1-2 db - whereas with a
> > better shield I should get a 10+ db reduction.
> >
> > The downside is that I'd need some 20 foot step ladders to do this,
> > whereas with the ferrites I can just place them at two points (on both
> > sides of my property).
> >
> > I could track down the noise sources in my neighborhood. But there are a
> > lot of them, and with a high turnover of renters every year - it'd be an
> > endless fight.
> >
> > Aaron
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 05 Dec 2013 10:27:58 -0600 (CST)
> From: David Robbins <k1ttt@verizon.net>
> To: rfi@contesting.com
> Subject: [RFI] DANGER WILL ROBINSON!!!!!
> Message-ID: <909329331.35755.1386260878225.JavaMail.root@vznit170076>
> Content-Type: text/plain; charset=UTF-8
>
> Just hear this on radio ad... "The same RF skin treatment available in
> your doctor's office, now available at home"
> RF??? on your skin??? and at HOME!?!?!?!?! even if this is in an ISM
> band just think of the possibilities of an intentional radiator strong
> enough to do something to your skin left laying around at home! how can
> ever be thought of as a good idea????
>
> http://www.dermawand.com/
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 5 Dec 2013 16:51:39 +0000
> From: "EDWARDS, EDDIE J" <eedwards@oppd.com>
> To: "rfi@contesting.com" <rfi@contesting.com>
> Subject: Re: [RFI] DANGER WILL ROBINSON!!!!!
> Message-ID:
> <D06D412B23374243B17AF061115E4D3C494543EB@SECEX02.oppd.oppd-ds.com
> >
> Content-Type: text/plain; charset="us-ascii"
>
> Technological snake oil has been around a long time, and won't ever go
> away.
>
> And Diathermy is still considered a 100 year old medical treatment, but
> you don't hear about it much anymore. Using it to look younger looks more
> like snake oil BS to me.
>
> 73, de ed -K0iL
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of David Robbins
> Sent: Thursday, December 05, 2013 10:28 AM
> To: rfi@contesting.com
> Subject: [RFI] DANGER WILL ROBINSON!!!!!
>
> Just hear this on radio ad... "The same RF skin treatment available in
> your doctor's office, now available at home"
> RF??? on your skin??? and at HOME!?!?!?!?! even if this is in an ISM
> band just think of the possibilities of an intentional radiator strong
> enough to do something to your skin left laying around at home! how can
> ever be thought of as a good idea????
>
> http://www.dermawand.com/
>
> _______________________________________________
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>
> Subject: Digest Footer
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> ------------------------------
>
> End of RFI Digest, Vol 131, Issue 9
> ***********************************
>
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