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Total 18 documents matching your query.

1. [Amps] Wire (score: 1): Author: "Rich Schmuke" <rdj@wildblue.net>; Date: Wed, 23 Jul 2008 16:17:44 -0500; I often see a note about the use of Teflon wire for baluns . Does any know a reason why TefzelR ETFE insulated wire would not be as good or better because the dielectric strength is even higher and; /archives//html/Amps/2008-07/msg00219.html (6,651 bytes)
2. [Amps] Wire (score: 1): Author: "Rich Schmuke" <rdj@wildblue.net>; Date: Wed, 23 Jul 2008 15:21:11 -0500; I often see a note about the use of Teflon wire for baluns . Does any know a reason why TefzelR ETFE insulated wire would not be as good or better because the dielectric strength is even higher and t; /archives//html/Amps/2008-07/msg00317.html (6,742 bytes)
3. Re: [Amps] Wire (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Mon, 28 Jul 2008 10:18:31 -0400; Rich [snip] Does any know a reason why TefzelR ETFE insulated wire would not be as good or better because the dielectric strength is even higher... [snip] A balun will generate heat. Manufacturers of; /archives//html/Amps/2008-07/msg00319.html (7,480 bytes)
4. Re: [Amps] Wire (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 28 Jul 2008 09:18:07 -0600; I had responded to Rich last week but I guess he either didn't like my answer or just wanted more opinions. Look at http://www.welchfluorocarbon.com/techdata.htm#Table1FluoropolymerSelectionGuide for; /archives//html/Amps/2008-07/msg00320.html (9,531 bytes)
5. Re: [Amps] Wire (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 28 Jul 2008 08:19:44 -0700; Yes, but how much heat depends on the design and quality of the balun -- the number of turns, the core material -- and the operating frequency (again, the core material). The use of coax rated for hi; /archives//html/Amps/2008-07/msg00321.html (8,339 bytes)
6. Re: [Amps] Wire (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 28 Jul 2008 11:35:17 -0400; <SNIP> Further, it has been Unfortunately that is not exactly a pratical solution with a balun mounted in an ATU or at the house end of an open wire feed. Since the E & I on the open feeders is an un; /archives//html/Amps/2008-07/msg00323.html (8,688 bytes)
7. Re: [Amps] Wire (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 28 Jul 2008 11:36:02 -0400; Larry, is the cold flow performance of the Tefzel better than Teflon? Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2008-07/msg00324.html (10,810 bytes)
8. Re: [Amps] Wire (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Mon, 28 Jul 2008 10:21:19 -0600; Carl, I can't say for sure but others have told me that cold flow was the primary reason it was used rather than Teflon. In aircraft usage, wires are bundled and lashed down so creep is a big deal if; /archives//html/Amps/2008-07/msg00331.html (11,755 bytes)
9. Re: [Amps] Wire (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 28 Jul 2008 10:19:11 -0700; My experience when feeding a balanced antenna with a common mode choke at the transmitter end is the following: reducing the reactive component at the balun terminals reduced heating. I am not sure w; /archives//html/Amps/2008-07/msg00337.html (8,469 bytes)
10. Re: [Amps] Wire (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Mon, 28 Jul 2008 13:37:27 -0400; [snip] It has been shown (by W8JI, among others) that mismatch is NOT a contributor to heating in a choke balun. Heating in a current balun is proportional to the square of the common mode current. [; /archives//html/Amps/2008-07/msg00338.html (8,510 bytes)
11. Re: [Amps] Wire (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 28 Jul 2008 11:04:47 -0700; Because they are badly designed, and thus don't sufficiently limit the common mode current! Do any of them specify their common mode impedance vs. frequency? Voltage baluns are TRANSFORMERS, not chok; /archives//html/Amps/2008-07/msg00339.html (8,749 bytes)
12. Re: [Amps] Wire (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 28 Jul 2008 14:45:02 -0400; Hello Larry: Actually, the main aerospace criteria for the wider use of Tefzel has to do with the overall weight and ampacity of the wiring system. The Tefzel dielectric permits thinner walls, with h; /archives//html/Amps/2008-07/msg00341.html (13,855 bytes)
13. Re: [Amps] Wire (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Mon, 28 Jul 2008 12:17:59 -0700; The Aviation World is quite in the spotlight on Wiring issues, and undergoing a lot of soul serching on solving tough problems, in aging aircraft wiring, and specialized insulations long accepted, bu; /archives//html/Amps/2008-07/msg00342.html (14,980 bytes)
14. Re: [Amps] Wire (score: 1): Author: "Rich Schmuke" <rdj@wildblue.net>; Date: Mon, 28 Jul 2008 17:52:13 -0500; To Larry , Harold and all, sorry for being slow in a reply but I have been reading the notes about the wire. I have some short lengths left over from an aircraft job. The rating on it seem very good; /archives//html/Amps/2008-07/msg00344.html (11,386 bytes)
15. Re: [Amps] Wire (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Mon, 28 Jul 2008 20:54:09 -0400; Then you take a look in an *older* aircraft. Many make what's behind my computers and ham equipment look like a work of art. They also have a great color coding system. "White"! I should take a photo; /archives//html/Amps/2008-07/msg00346.html (8,583 bytes)
16. Re: [Amps] Wire (score: 1): Author: "Gary Hinson" <Gary@isect.com>; Date: Tue, 29 Jul 2008 14:18:43 +1200; Hi Rich. There *may* be some cunning impedence reason but my guess is that the main driver for using Teflon insulated wire is good HV insulation coupled with low diameter. Personally, I find the str; /archives//html/Amps/2008-07/msg00347.html (8,682 bytes)
17. Re: [Amps] Wire (score: 1): Author: Doug Renwick <ve5ra@sasktel.net>; Date: Mon, 28 Jul 2008 20:45:52 -0600; Gary, That is a very unique callsign you have ZL2!FB. Do people generally copy it correctly? Doug The water jump is long and the barrier may be high, you might break every bone, but it's so much fun; /archives//html/Amps/2008-07/msg00348.html (8,876 bytes)
18. Re: [Amps] Wire (score: 1): Author: <d.cutter@ntlworld.com>; Date: Tue, 29 Jul 2008 12:46:26 +0100; My *2kW* Drake balun has a polycarbonate frame around the toroid to support the bare wire off the toroid. Bare wire cools better, particularly when suspended off the toroid like this. David G3UNA --; /archives//html/Amps/2008-07/msg00349.html (9,729 bytes)

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