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Total 13 documents matching your query.

1. Topband: 1:2 UNUN (score: 1): Author: Kenny Silverman <kenny.k2kw@gmail.com>; Date: Mon, 17 Jan 2022 09:18:30 -0500; Does anyone have a drawing on how to wind a 1500w 1:2 UNUN? And what type of core is needed? This is for my 160m vertical which is about 28 ohms. Regards , Kenny K2KW _________________ Searchable Arc; /archives//html/Topband/2022-01/msg00096.html (6,749 bytes)
2. Re: Topband: 1:2 UNUN (score: 1): Author: Bill Shell - N6WS <n6ws@n6ws.com>; Date: Mon, 17 Jan 2022 06:34:39 -0800; Kenny, I used three large torroid cores, 12AWG silver/teflon wire, and 10 turns/14 turns to match 25 ohms to 50 ohms. There is a picture of the transformer in my Phasing Switch Box at: https://www.n; /archives//html/Topband/2022-01/msg00097.html (7,182 bytes)
3. Re: Topband: 1:2 UNUN (score: 1): Author: Kenny Silverman <kenny.k2kw@gmail.com>; Date: Mon, 17 Jan 2022 11:47:37 -0500; Thanks Frank. Are these 1/4 wl lines? And are T-connectors OK? Regards , Kenny K2KW _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector; /archives//html/Topband/2022-01/msg00099.html (8,383 bytes)
4. Re: Topband: 1:2 UNUN (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Mon, 17 Jan 2022 11:29:25 -0500 (EST); Hi Kenny, A very workable alternative is to use two lengths of 75 ohm coax in parallel. RG-11 is the best choice, but two lengths of RG-6 will also work. No need to coil it up, simply use it as part; /archives//html/Topband/2022-01/msg00100.html (7,931 bytes)
5. Re: Topband: 1:2 UNUN (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Mon, 17 Jan 2022 11:53:22 -0500 (EST); Kenny - Yes, 1/4 wavelength electrical length. 89 feet of RG-11 (not the foam dielectric version used for CATV) UHF T connectors are fine, if you need any I'll give them to you. 73 Frank W3LPL Thanks; /archives//html/Topband/2022-01/msg00101.html (8,972 bytes)
6. Re: Topband: 1:2 UNUN (score: 1): Author: Tree <tree@kkn.net>; Date: Mon, 17 Jan 2022 08:54:03 -0800; 1/4 wavelength of 75 / 2 = 37.5 Ohms Will take your 28 ohms very close to 50. _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector; /archives//html/Topband/2022-01/msg00102.html (8,810 bytes)
7. Re: Topband: 1:2 UNUN (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Mon, 17 Jan 2022 12:33:12 -0500 (EST); Hi Pete, 1/4 wave electrical length. 89 feet for two RG-11 solid dielectric coaxes in parallel. 73 Frank W3LPL lengths? 1/4 wave? 73, Pete N4ZR Check out the new Reverse Beacon Network web server at; /archives//html/Topband/2022-01/msg00103.html (9,319 bytes)
8. Re: Topband: 1:2 UNUN (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Mon, 17 Jan 2022 10:09:48 -0800; Maybe this will help: I use a 1:2.25 Unun (3 to 2 turns ratio). It will match 22.2 ohms to 50 ohms. It is wound on a single 2.4 inch diameter core of 77 material. A pair of RG-58 coax cables are woun; /archives//html/Topband/2022-01/msg00104.html (9,515 bytes)
9. Re: Topband: 1:2 UNUN (score: 1): Author: "Tim Duffy" <k3lr@k3lr.com>; Date: Mon, 17 Jan 2022 13:34:56 -0500; I match my 26 ohm feed point with a simple L network. One series coil then a shunt capacitor. Steps up to 50 ohms perfectly. 73 Tim K3LR Maybe this will help: I use a 1:2.25 Unun (3 to 2 turns ratio); /archives//html/Topband/2022-01/msg00105.html (9,989 bytes)
10. Re: Topband: 1:2 UNUN (score: 1): Author: Mike Furrey <mikefurrey@att.net>; Date: Mon, 17 Jan 2022 20:18:52 +0000 (UTC); Perhaps a "hair pin" match? I used a hair pin coil at the base of a vertical that was 35 ohms. 73, Mike WA5POK 73 Tim K3LR Maybe this will help: I use a 1:2.25 Unun (3 to 2 turns ratio). It will mat; /archives//html/Topband/2022-01/msg00107.html (10,500 bytes)
11. Re: Topband: 1:2 UNUN (score: 1): Author: Wes <wes_n7ws@triconet.org>; Date: Mon, 17 Jan 2022 14:13:17 -0700; I'll second Rick's approach, although I've not incorporated it yet. I built a parallel wire transformer per Sevick Fig 6-11. It measures just fine. Until it's installed I'm using an inverted-L wit; /archives//html/Topband/2022-01/msg00108.html (10,027 bytes)
12. Re: Topband: 1:2 UNUN (score: 1): Author: Kenneth Silverman <kenny.k2kw@gmail.com>; Date: Mon, 17 Jan 2022 21:28:44 -0500; Thanks for all the replies on and off the reflector. My antenna, now a 90' top loaded vertical with 60 x 100' radials, was not transmitting well. While trying to fix it, I changed from an inverted L; /archives//html/Topband/2022-01/msg00109.html (12,242 bytes)
13. Topband: 1:2 UNUN (score: 1): Author: "jim.thom jim.thom@telus.net" <jim.thom@telus.net>; Date: Tue, 18 Jan 2022 09:11:55 -0800; < Perhaps a "hair pin" match? I used a hair pin coil at the base of a vertical that was 35 ohms. <73, Mike WA5POK the coil for 1:1 swr. The coil will also DC ground the vertical. Dead simple. provide; /archives//html/Topband/2022-01/msg00111.html (8,428 bytes)

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