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1. [Amps] Black heat shields (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sat, 18 Dec 2010 19:40:54 -0700; I've not been following this discussion in detail, but to me the issue seems pretty straightforward. A black shield around tubes will radiate heat away from the tubes, since the black absorbs radiati; /archives//html/Amps/2010-12/msg00220.html (7,270 bytes)
2. Re: [Amps] Black heat shields (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sat, 18 Dec 2010 20:53:16 -0700; Hi Paul, Yes, if the shield is bonded to the chassis, and as long as the chassis is at a lower temperature than the shield, then there will be a heat flow to the chassis. However, the devil is in the; /archives//html/Amps/2010-12/msg00222.html (7,339 bytes)
3. Re: [Amps] Black heat shields (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sat, 18 Dec 2010 23:33:10 -0500; yes but the temperature of the alu. sheet is much less than the tube still and the the heat absorbed by the aluminum sheet is related to its temperature in Kevin raised to the 4th power. So if it doe; /archives//html/Amps/2010-12/msg00224.html (9,056 bytes)
4. Re: [Amps] Black heat shields (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sat, 18 Dec 2010 23:38:15 -0500; Bare Aluminum if real can make a real good IR reflector. If you can make it so that it reflects the IR to the case it may work even better. 73 Bill wa4lav ________________________________________ Fro; /archives//html/Amps/2010-12/msg00225.html (9,611 bytes)
5. Re: [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 19 Dec 2010 13:04:54 +0000; If it's not real it is made of paper and will burn. Painting an aluminum shield would not work nearly as well a anodizing it black. That is how equipment manufactures get black aluminum heat sinks. -; /archives//html/Amps/2010-12/msg00241.html (8,017 bytes)
6. Re: [Amps] Black heat shields (score: 1): Author: donroden@hiwaay.net; Date: Sun, 19 Dec 2010 10:04:07 -0600; http://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html Anybody ever see a polished solar hot water collector ? Ever wondered why not ? Don W4DNR _______________________________________; /archives//html/Amps/2010-12/msg00245.html (7,910 bytes)
7. Re: [Amps] Black heat shields (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 19 Dec 2010 15:15:21 -0500; I once had a number of C-band satellite dishes. One, an 8 footer was solid Aluminum. It was getting pretty scruffy looking out in the elements so I decided to paint it. The only suitable paint I had,; /archives//html/Amps/2010-12/msg00252.html (10,282 bytes)
8. Re: [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Sun, 19 Dec 2010 20:47:47 +0000; /*snip*/ It is standard and normal to paint satellite dish faces FLAT WHITE to scatter the IR from the sun. -- Ron KA4INM - I'm proud to be Chuck's pop! ______________________________________________; /archives//html/Amps/2010-12/msg00254.html (8,444 bytes)
9. Re: [Amps] Black heat shields (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sun, 19 Dec 2010 10:59:26 -1000; The Smithsonian Submillimeter Array dishes have a special texture to their surface to help scatter IR ( and thus not fry the receiver front end ) while still maintaining a good enough surface qualit; /archives//html/Amps/2010-12/msg00255.html (8,882 bytes)
10. Re: [Amps] Black heat shields (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 19 Dec 2010 18:53:00 -0500; It must have done wonders for the NF after you went black. Maybe thats why dishes are normally painted a light flat color dont you think? Carl _______________________________________________ Amps mai; /archives//html/Amps/2010-12/msg00263.html (11,537 bytes)
11. Re: [Amps] Black heat shields (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 19 Dec 2010 19:34:05 -0500; The LNB was well out in the open so it stayed pretty well at ambient and the signals were strong enough NF was no problem ... With the exception of one satellite that was way down on the Western hori; /archives//html/Amps/2010-12/msg00264.html (12,529 bytes)
12. Re: [Amps] Black heat shields (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 19 Dec 2010 21:42:32 -0500; I am not sure if the paint would have much effect on the NF at GHz frequencies since it is most likely completely transparent , very low emissivity, at those frequencies. Ir it had a high emissivity; /archives//html/Amps/2010-12/msg00267.html (12,812 bytes)
13. Re: [Amps] Black Heat Shields (score: 1): Author: "Jim Garland" <4cx250b@muohio.edu>; Date: Sun, 19 Dec 2010 19:59:25 -0700; I've really enjoyed this thread. It's interesting how very practical issues, such as how to cool an SB-220, eventually regress to questions about science and basic physics. That's one of the things t; /archives//html/Amps/2010-12/msg00268.html (12,720 bytes)
14. [Amps] Black heat shields (score: 1): Author: Ron Youvan <ka4inm@tampabay.rr.com>; Date: Mon, 20 Dec 2010 03:01:11 +0000; /*snip*/ It is standard and normal to paint satellite dish faces with FLAT WHITE NON conductive NON metallic paint to scatter the IR from the sun. -- Ron KA4INM - I'm proud to be Chuck's pop! _______; /archives//html/Amps/2010-12/msg00269.html (8,508 bytes)
15. Re: [Amps] Black Heat Shields (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sun, 19 Dec 2010 17:09:01 -1000; And the reason that they call it a blackbody is that black bodies do it ( absorb radiation AND reradiate) better than any other color. DE N6KB _______________________________________________ Amps ma; /archives//html/Amps/2010-12/msg00270.html (8,799 bytes)
16. Re: [Amps] Black Heat Shields (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 19 Dec 2010 22:27:22 -0500; If I recall the classic calculation of blackbody radiation is done with a hollow sphere with a tiny hole. The inside of the sphere is perfectly reflective and energy that is in it is captured except; /archives//html/Amps/2010-12/msg00271.html (13,900 bytes)
17. Re: [Amps] Black Heat Shields (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 19 Dec 2010 22:46:02 -0500; Think of a blackbody in thermodynamics as the analogy to the isotropic source in antennas. it doesn't exist but makes an excellent reference point. 73 Roger (K8RI) ___________________________________; /archives//html/Amps/2010-12/msg00272.html (8,887 bytes)
18. Re: [Amps] Black heat shields (score: 1): Author: "Mike" <noddy1211@sbcglobal.net>; Date: Sun, 19 Dec 2010 20:19:27 -0800; All the direct TV ones I have seen are gray /*snip*/ It is standard and normal to paint satellite dish faces with FLAT WHITE NON conductive NON metallic paint to scatter the IR from the sun. -- Ron K; /archives//html/Amps/2010-12/msg00273.html (9,098 bytes)
19. Re: [Amps] Black heat shields (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sun, 19 Dec 2010 23:54:05 -0500; They aren't large enough to be of concern. We are talking about "C-band" dishes large enough when focused the heat will melt solder. The small ones are 8' while the typical large ones go up to around; /archives//html/Amps/2010-12/msg00274.html (9,109 bytes)
20. Re: [Amps] Black Heat Shields (score: 1): Author: Mike Saculla <fqm@msn.com>; Date: Sun, 19 Dec 2010 21:20:18 -0800; If any of you discover a material that absorbs heat faster than it radiates it, please let me know. We can become millionaires together. Conservation of energy in the universe - materials absorb and; /archives//html/Amps/2010-12/msg00275.html (10,938 bytes)

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