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1. [Amps] FW: RFI Question (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Sat, 4 Feb 2006 07:37:35 -0600; Curiosity has struck. Is there any type of spray paint that offers an appreciable amount of RF shielding? I've always wonder about the coating of radar absorbent material that's put on the stealth ai; /archives//html/Amps/2006-02/msg00077.html (8,816 bytes)
2. Re: [Amps] FW: RFI Question (score: 1): Author: "m.ford" <k1ern@direcway.com>; Date: Sat, 04 Feb 2006 11:26:02 -0500; In the end, most of it is dissipated as heat. Mike k1ern _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-02/msg00081.html (7,428 bytes)
3. Re: [Amps] FW: RFI Question (score: 1): Author: "Brass Pounder" <wf3j@comcast.net>; Date: Sat, 4 Feb 2006 11:47:08 -0500; put Stealth is a XX century technology, works against countries which still use microwave radars. Developed countries use satellites with infrared sensors. The heat from engine exhaust is still trac; /archives//html/Amps/2006-02/msg00082.html (7,535 bytes)
4. Re: [Amps] FW: RFI Question (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Sat, 4 Feb 2006 11:10:12 -0600; A couple more questions arise. Exactly what is the composition of radar absorbent material and how is it applied to the metal surfaces? How does rf absorbent material react to different ranges of wav; /archives//html/Amps/2006-02/msg00085.html (9,269 bytes)
5. Re: [Amps] FW: RFI Question (score: 1): Author: "Ed Swynar" <gswynar@durham.net>; Date: Sat, 4 Feb 2006 11:51:37 -0500; There WAS a spray-on RFI shielding "paint" available many, many moons ago, per a "New Products" listing in QST, back in the early/mid 80's, as I recall... The writer touted the advantages such a prod; /archives//html/Amps/2006-02/msg00087.html (9,281 bytes)
6. Re: [Amps] FW: RFI Question (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Sat, 4 Feb 2006 09:30:06 -0800; "A couple more questions arise. Exactly what is the composition of radar absorbent material and how is it applied to the metal surfaces? " You do not simply take a B-36 or a battleship and cover it w; /archives//html/Amps/2006-02/msg00088.html (8,700 bytes)
7. Re: [Amps] FW: RFI Question (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Feb 2006 18:39:10 +0100 (CET); Larry asked: absorbent material and how is it applied to the metal surfaces? How does rf absorbent material react to different ranges of wavelengths?< RAM (Radar Absorbent Material) varies, depending; /archives//html/Amps/2006-02/msg00089.html (7,692 bytes)
8. Re: [Amps] FW: RFI Question (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Sat, 4 Feb 2006 11:58:04 -0600; Didn't see anything at Allied or Mouser but ran across the site below that sales paint and paint additives that are supposed to have RF shielding properties. Be nice to know they are effective or not; /archives//html/Amps/2006-02/msg00090.html (9,835 bytes)
9. Re: [Amps] FW: RFI Question (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sat, 04 Feb 2006 18:20:07 +0000; The impedance of free space is 377 Ohms/square. Spacepaint is a radar absorbing technology that attempts to match this value over a range of RF frequencies of interest. If it worked, we would not hav; /archives//html/Amps/2006-02/msg00092.html (8,767 bytes)
10. Re: [Amps] FW: RFI Question (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Sat, 04 Feb 2006 18:32:24 +0000; Interesting. There is an optical technique called the "crab's eye lens" which uses a deep parabola with a detector (non imaging) at the top of the curve. It works by glancing reflections of the light; /archives//html/Amps/2006-02/msg00093.html (9,985 bytes)
11. Re: [Amps] FW: RFI Question (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Sat, 4 Feb 2006 17:43:41 -0600; This is getting to be OT, but a point should be made that IR tracking was used by the US military more than 40 years ago. The stealth aircraft reduces the heat signature along with the radar signatur; /archives//html/Amps/2006-02/msg00095.html (9,127 bytes)
12. Re: [Amps] FW: RFI Question (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 6 Feb 2006 23:00:40 -0500; Yup! And the stuff actually worked, too. I used some sprayed on the inside of a WYSE terminal in order to reduce the RFI from that unit. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not; /archives//html/Amps/2006-02/msg00148.html (8,252 bytes)
13. Re: [Amps] FW: RFI Question (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Tue, 7 Feb 2006 05:33:35 -0600; Anyone remember what company it was in the QST listing that sold the RFI shielding paint? I've had trouble with RFI getting into my computer speakers. Maybe a good coat of RFI shielding paint will so; /archives//html/Amps/2006-02/msg00152.html (8,577 bytes)
14. Re: [Amps] FW: RFI Question (score: 1): Author: "N7HIY" <N7HIY@comcast.net>; Date: Tue, 7 Feb 2006 04:13:13 -0800; put ferrites on the speaker leads first, as many turns thru core as possible...will be more more effective.....clip on ferrites are not very effective...made for those looking for placebo effect... s; /archives//html/Amps/2006-02/msg00153.html (9,830 bytes)
15. Re: [Amps] FW: RFI Question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 07 Feb 2006 07:30:12 -0600; WRONG! Clip-on ferrites ARE effective for the frequencies for which they are designed -- VHF. They are NOT intended for HF, and they don't work at HF. See the tutorial on my website. http://audiosyst; /archives//html/Amps/2006-02/msg00154.html (8,361 bytes)
16. Re: [Amps] FW: RFI Question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 07 Feb 2006 09:40:10 -0600; Yes. As noted in my tutorial, ANY coil of wire will see its R and L multiplied by the square of the number of turns, and stray capacitance between the turns. A ferrite surrounding the wire adds its o; /archives//html/Amps/2006-02/msg00156.html (8,250 bytes)

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