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1. Topband: T-loaded vertical (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Tue, 18 Feb 2020 11:45:27 -0500; I keep seeing references to people using symmetrical wire top loading instead of the single wire of an inverted L. My question is how to calculate the appropriate length for the two top-loading wire; /archives//html/Topband/2020-02/msg00159.html (6,539 bytes)
2. Re: Topband: T-loaded vertical (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 18 Feb 2020 10:00:14 -0800; An NEC model. It's a pretty simple one, and can be done in the free version that comes with the ARRL Antenna Book. 73, Jim K9YC _________________ Searchable Archives: http://www.contesting.com/_topba; /archives//html/Topband/2020-02/msg00162.html (7,620 bytes)
3. Re: Topband: T-loaded vertical (score: 1): Author: donovanf@starpower.net; Date: Tue, 18 Feb 2020 13:00:34 -0500 (EST); Hi Pete, Symmetrical T-verticals offer a performance improvement over inverted-L verticals but with a major downside if you operate on the higher bands. If the flat top of the T-vertical is near reso; /archives//html/Topband/2020-02/msg00163.html (8,442 bytes)
4. Re: Topband: T-loaded vertical (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 18 Feb 2020 10:21:37 -0800; Yet another example of Frank coming up with excellent advice about things we hadn't thought of. At least I hadn't. Thanks Frank. 73, Jim K9YC _________________ Searchable Archives: http://www.contest; /archives//html/Topband/2020-02/msg00165.html (7,314 bytes)
5. Re: Topband: T-loaded vertical (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Tue, 18 Feb 2020 11:09:10 -0800; At least 3 different answers: 1. If you want the antenna to be resonant on 160 as is (without a loading coil, etc), then as a rule of thumb, the length of the vertical section plus the length of ONE; /archives//html/Topband/2020-02/msg00167.html (8,857 bytes)
6. Re: Topband: T-loaded vertical (score: 1): Author: <dj7ww@t-online.de>; Date: Tue, 18 Feb 2020 20:04:18 +0100; Hi Frank, I just simulated a T vertical 50m away from my 38m high 3L 40m yagi with EZNEC. Pattern and gain did not change on the yagi when it beamed 90° away from the yagi. Only when I turned the yag; /archives//html/Topband/2020-02/msg00168.html (10,034 bytes)
7. Topband: T-loaded vertical (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 18 Feb 2020 14:49:48 -0500; modeled it in his NEC-4 licensed software, and found no increase in the far field compared to a resonant antenna." Looks like I accidentally cross-posted to the TowerTalk list, so I'll bring it back; /archives//html/Topband/2020-02/msg00170.html (8,055 bytes)
8. Re: Topband: T-loaded vertical (score: 1): Author: "Ed Sawyer" <sawyered@earthlink.net>; Date: Wed, 19 Feb 2020 13:13:02 -0500; The answer to the top loading is that the top is essentially the same as if it was an L on the antenna - just with the connection point moved to the center. I would add maybe 5 ft on either side of t; /archives//html/Topband/2020-02/msg00178.html (8,067 bytes)
9. Re: Topband: T-loaded vertical (score: 1): Author: donovanf@starpower.net; Date: Wed, 19 Feb 2020 14:13:20 -0500 (EST); Hi Ed, The affect of the T-vertical on a nearby HF Yagi is easily modeled in EZNEC or your favorite antenna modelling program. You'll be surprised by the results if the horizontal top is +/- 15% of r; /archives//html/Topband/2020-02/msg00179.html (11,740 bytes)
10. Re: Topband: T-loaded vertical (score: 1): Author: "Ed Sawyer" <sawyered@earthlink.net>; Date: Wed, 19 Feb 2020 14:50:13 -0500; Frank, You will have me grabbing my EZNEC tonight and playing around. In my case my tops are around 60 ft long and they are thankfully perpendicular to my 20M yagi and about 120 ft away. However if I; /archives//html/Topband/2020-02/msg00180.html (12,764 bytes)
11. Re: Topband: T-loaded vertical (score: 1): Author: donovanf@starpower.net; Date: Wed, 19 Feb 2020 14:57:04 -0500 (EST); Hi Ed, A T-top at right angles to a Yagi will have little affect, but anything close to broadside is very bad within 500 feet or less on 40 meters. Fortunately a 60 foot top is just short enough to h; /archives//html/Topband/2020-02/msg00181.html (13,788 bytes)
12. Re: Topband: T-loaded vertical (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Wed, 19 Feb 2020 12:04:22 -0800; I have personally found that for Ts that are only 70 ft vertical, like mine, the ground losses of the long topped L are not as desirable as the cancelled out horizontal lobes of the T. If the T were; /archives//html/Topband/2020-02/msg00182.html (9,498 bytes)
13. Re: Topband: T-loaded vertical (score: 1): Author: "Ed Sawyer" <sawyered@earthlink.net>; Date: Wed, 19 Feb 2020 15:31:21 -0500; Rick said it better. Thanks Rick. The T has been a great performer for me in 4 different locations over the years. I swear by it for 55 - 70 ft vertical sections. Ed N1UR When you model an inverted L; /archives//html/Topband/2020-02/msg00183.html (9,486 bytes)
14. Re: Topband: T-loaded vertical (score: 1): Author: w5zn@w5zn.org; Date: Wed, 19 Feb 2020 16:37:56 -0700; So, what impact will the yagi have on the T element??? 73 Joel W5ZN A T-top at right angles to a Yagi will have little affect, but anything close to broadside is very bad within 500 feet or less on 4; /archives//html/Topband/2020-02/msg00184.html (15,133 bytes)
15. Re: Topband: T-loaded vertical (score: 1): Author: GEORGE WALLNER <aa7jv@atlanticbb.net>; Date: Wed, 19 Feb 2020 23:39:30 -0500; The T has another advantage: it is better on 80 (and 40) if you can match it. A 160 m inverted L, with a substantial length horizontal wire, makes a poor 80 meter radiator because of high angles. A T; /archives//html/Topband/2020-02/msg00186.html (10,169 bytes)
16. Re: Topband: T-loaded vertical (score: 1): Author: Edward via Topband <topband@contesting.com>; Date: Thu, 20 Feb 2020 09:22:59 +0300; That's good news. I am in Saudi Arabia on a small lot. My plan is to use my ladderline-fed Cobra Ultralite dipole (73' long), tying the 100' ladderline together, making a T. Will load it against a de; /archives//html/Topband/2020-02/msg00187.html (11,058 bytes)

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