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21. Re: [Amps] nylons (score: 1): Author: Tomm Aldridge <KD7QAE@ARRL.NET>; Date: Wed, 16 Mar 2005 04:08:13 +0000; John, In my opinion, the use of Nylon for general standoffs in an RF amplifier is perfectly fine if a bit of thought is given as to the temperatuer they will be exposed to. I would not consider Nylon; /archives//html/Amps/2005-03/msg00357.html (9,839 bytes)
22. Re: [Amps] nylons (score: 1): Author: Tony King - W4ZT <amps@w4zt.com>; Date: Tue, 15 Mar 2005 23:56:01 -0500; Tomm, John and the group, I agree about not using nylon in high RF fields. Best to use something better. Going directly to John's question about 3/8"x1/2 inch insulators, instead of going to the hard; /archives//html/Amps/2005-03/msg00358.html (10,549 bytes)
23. Re: [Amps] nylons (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Tue, 15 Mar 2005 21:02:03 -0800; I don't think you would learn much by just throwing the material into an amplifier chassis in some arbitrary fashion. The thing you want to do is induce a significant amount of displacement current i; /archives//html/Amps/2005-03/msg00359.html (9,682 bytes)
24. Re: [Amps] nylons (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 16 Mar 2005 08:09:44 +0100; It is most unlikely that any differences will be noted between nylon (or other "lossy" plastics) or high-grade dielectrics in these applications, as the E-field intensities around the components will; /archives//html/Amps/2005-03/msg00361.html (16,813 bytes)
25. Re: [Amps] nylons (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 16 Mar 2005 03:35:45 -0800; Not bad, not bad. And if the sample is small it won't get hot at all -- even though the D-factor is bad news. Been there done that. Went to the local plastics emporium and got the data sheet. Nylon i; /archives//html/Amps/2005-03/msg00365.html (18,902 bytes)
26. Re: [Amps] nylons (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 16 Mar 2005 03:39:58 -0800; Amen, Karl-Arne The styrenes - such as ABS - are quite good around RF. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@co; /archives//html/Amps/2005-03/msg00366.html (13,036 bytes)
27. Re: [Amps] nylons (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 11:50:57 +0000; At least one cross linked versions, Rexolite, is really good and also mechanically strong. It's horrible to machine, and very difficult to source this side of the Atlantic :-( Steve _________________; /archives//html/Amps/2005-03/msg00367.html (8,724 bytes)
28. Re: [Amps] nylons (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 16 Mar 2005 03:47:34 -0800; Acrylics do not have a low D-factor. I use ABS around RF. It's commonly available, costs little, easy to cut with a sharp saw - provided one goes slowly, and it's fairly strong. Richard L. Measures,; /archives//html/Amps/2005-03/msg00368.html (15,373 bytes)
29. Re: [Amps] nylons (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 16 Mar 2005 03:57:33 -0800; Even though it is excellent around RF, the trouble with TFE is that it cold-flows and it has little strength. . For strength, RF-tolerance and workability, G-10 is hard to beat. Richard L. Measures,; /archives//html/Amps/2005-03/msg00369.html (11,921 bytes)
30. Re: [Amps] nylons (score: 1): Author: ToddRoberts2001@aol.com; Date: Wed, 16 Mar 2005 09:06:15 EST; United States Plastic Corp. ( www.usplastic.com ) has a very good selection of plastics that we would be interested in for high-power RF circuits. They have phenolic rods - tubing - sheets Grade XX u; /archives//html/Amps/2005-03/msg00374.html (8,053 bytes)
31. Re: [Amps] nylons (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Wed, 16 Mar 2005 09:18:56 -0800; You might look for a material called rexolite. I suspect that it is available at plastic suppliers. I used it many years ago for some microwave applications. It is easily machinable, has good dielect; /archives//html/Amps/2005-03/msg00376.html (8,068 bytes)
32. Re: [Amps] nylons (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Wed, 16 Mar 2005 09:24:29 -0800; I thought rexolite was fairly easy to machine (at least the machinists where I worked didn't complain when we had them fabricate some parts from it, but maybe they liked challenges.) I retract that p; /archives//html/Amps/2005-03/msg00377.html (9,327 bytes)
33. Re: [Amps] nylons (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 17:34:32 -0000; Don't jump to that - maybe my machinists weren't up to the challenge! I think it tends to clog and bind, I'm guessing there's an art to getting the tool sharpening and feed speeds just right. Can any; /archives//html/Amps/2005-03/msg00378.html (9,851 bytes)
34. Re: [Amps] nylons (score: 1): Author: Tony King - W4ZT <amps@w4zt.com>; Date: Wed, 16 Mar 2005 13:21:11 -0500; I agree and MSC carries G10 rod, tube and sheet. It's found on page 1794 of their big book: <http://www1.mscdirect.com/CGI/NNPDFF?PMPAGE=1794> A 48" length of 3/8" rod lists for $12.08 so 48x2=96-4(2; /archives//html/Amps/2005-03/msg00380.html (12,038 bytes)
35. Re: [Amps] nylons (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 16 Mar 2005 11:41:06 -0800; I used to some to load a 3.3 GHz waveguide antenna that I worked on for the air force about 15 years ago. The machinist didn't complain and the antenna worked as expected (it was build to print). Mik; /archives//html/Amps/2005-03/msg00381.html (10,460 bytes)
36. Re: [Amps] nylons (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Wed, 16 Mar 2005 22:51:46 -0000; Looks like it's me that stands corrected. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-03/msg00385.html (9,084 bytes)

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