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1. [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 31 May 2010 06:54:14 -0700; Apparently array solutions is now using type 31 material for their w1JR style baluns. The original stacked cores used type 61 material. Both the new style and the old style use several wraps of RG-39; /archives//html/Towertalk/2010-05/msg00719.html (9,090 bytes)
2. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Kevin Normoyle <knormoyle@surfnetusa.com>; Date: Mon, 31 May 2010 16:53:18 -0700; jim VE7RF mentioned the common use of crossover windings in toroid baluns, which is the area of some things I'm wondering about before I wind.... Questions: Wouldn't it be better to use less of the b; /archives//html/Towertalk/2010-05/msg00731.html (9,804 bytes)
3. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 31 May 2010 20:19:24 -0400; Instead of mounting the toriod stack flat in a 4x4x2 box, why not mount it "on end" in a deeper (e.g. 4x4x4 or 4x4x6) box? It might take a little creativity to build a mounting baffle but standing t; /archives//html/Towertalk/2010-05/msg00733.html (12,572 bytes)
4. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Kevin Normoyle <knormoyle@surfnetusa.com>; Date: Mon, 31 May 2010 17:43:55 -0700; Yeah I was contemplating that, Joe. I had noticed balundesigns had a new balun (25:50) that does that idea with a smaller core..picture here http://www.balundesigns.com/servlet/the-92/1-cln-2-unun-25; /archives//html/Towertalk/2010-05/msg00738.html (9,030 bytes)
5. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 31 May 2010 19:22:48 -0700; I've tried W1JR's crossover technique, and I can't measure any difference between it and a continuous winding. Other good engineers have also tried, and can't see any difference. My measured data is; /archives//html/Towertalk/2010-05/msg00744.html (12,010 bytes)
6. [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 1 Jun 2010 01:53:00 -0700; jim VE7RF mentioned the common use of crossover windings in toroid baluns, which is the area of some things I'm wondering about before I wind.... Questions: Wouldn't it be better to use less of the b; /archives//html/Towertalk/2010-06/msg00001.html (11,005 bytes)
7. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Tue, 1 Jun 2010 15:18:59 +0200; Hi Jim, Why should one bother for wire and core insulation if the balun will be used to feed a 50 ohms load? 73 Peter use enameled wire.. unless it's got lots of teflon on it.. or has a teflon tubing; /archives//html/Towertalk/2010-06/msg00002.html (7,683 bytes)
8. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 01 Jun 2010 10:55:33 -0700; To kill common mode current. See http://audiosystemsgroup.com/RFI-Ham.pdf The word "balun" has been used to describe many very different things. Impedance transformation by series/parallel combinatio; /archives//html/Towertalk/2010-06/msg00005.html (7,620 bytes)
9. [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 1 Jun 2010 18:29:19 -0700; Hi Jim, Why should one bother for wire and core insulation if the balun will be used to feed a 50 ohms load? 73 Peter know if it was for a 1:1 choke balun... or 2:1 or 4:1 nor what freqs. If enamel w; /archives//html/Towertalk/2010-06/msg00008.html (8,413 bytes)
10. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Kevin Normoyle <knormoyle@surfnetusa.com>; Date: Tue, 01 Jun 2010 19:36:40 -0700; To answer some of the questions: -1:1 current balun is the goal, 3.7-30mhz. 5k ohms choke impedance across the entire frequency span. I guess that's a basic question: Can it be done with one design?; /archives//html/Towertalk/2010-06/msg00009.html (10,824 bytes)
11. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 1 Jun 2010 22:59:21 -0400; That's my take after reading Sevick's Fourth ed. If it's a 1:1 choke with a reasonably-controlled low to moderate Z on the load side of the balun, then for HF, I would lean toward coax on a #31 core; /archives//html/Towertalk/2010-06/msg00010.html (8,840 bytes)
12. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 01 Jun 2010 20:10:17 -0700; One true answer? Gee, I've published measured data and showed exactly what I measured and how I measured it. Have you gotten that from any mfr of any balun or similar product? 3.5-30 MHz is hardly a; /archives//html/Towertalk/2010-06/msg00011.html (10,050 bytes)
13. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 01 Jun 2010 20:13:54 -0700; Sevick appears to have been a superb engineer, but #31 material was not available to him. It was developed after he was actively doing any research. Most, if not all of his designs used low loss mate; /archives//html/Towertalk/2010-06/msg00012.html (8,169 bytes)
14. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Kevin Normoyle <knormoyle@surfnetusa.com>; Date: Tue, 01 Jun 2010 21:11:51 -0700; I don't care about manufacturers. I'm just trying to decide what to make. You also showed that 12-16 turns of #14 THHN on a single type 31 core can have a much flatter response than the coax chokes,; /archives//html/Towertalk/2010-06/msg00015.html (9,750 bytes)
15. Re: [TowerTalk] Type 31 baluns (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 01 Jun 2010 21:55:56 -0700; Jim, Speaking of widebands.. what about recommendations for chokes to use with an autotuner at the feedpoint/base. That *is* a broadband application. My practical experience has been that you need to; /archives//html/Towertalk/2010-06/msg00016.html (8,861 bytes)
16. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 01 Jun 2010 23:15:28 -0700; They have a higher choking Z over a wider frequency range. No, I've not taken a serious look at any specialty coaxes that can be wound very tightly. I've looked at a lot of websites that folks have p; /archives//html/Towertalk/2010-06/msg00017.html (11,908 bytes)
17. Re: [TowerTalk] Type 31 baluns (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 01 Jun 2010 23:22:21 -0700; I've exactly what of any say HF don't That's an application where I think the bifilar THHN chokes would really shine, both because of their wide bandwidth, and because the tuner takes care of any mis; /archives//html/Towertalk/2010-06/msg00018.html (9,901 bytes)
18. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Wed, 2 Jun 2010 08:34:04 +0100; That would be me... The technical background is the same all over the world, but the cost of "named ferrite" [1] is much higher outside of the USA so cost-effectiveness is a much bigger part of the d; /archives//html/Towertalk/2010-06/msg00019.html (11,564 bytes)
19. Re: [TowerTalk] Type 31 baluns (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Wed, 02 Jun 2010 08:54:43 +0100; I find some of the comments about commercial suppliers a bit odd. I'm not here to promote Balun Designs products - I have no connection with them - but if you take a look at the performance shown her; /archives//html/Towertalk/2010-06/msg00020.html (8,627 bytes)
20. Re: [TowerTalk] Type 31 baluns (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 02 Jun 2010 06:03:38 -0700; A choke on the antenna side of the tuner? I hadn't thought about that. For the SGC type tuners the wire to the antenna is separated from the wire to the "ground" (you really don't want parallel C on; /archives//html/Towertalk/2010-06/msg00021.html (8,998 bytes)

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