- 1. [TowerTalk] SteppIR verticals (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Thu, 14 Aug 2008 13:58:41 -0700
- Recently I noticed several notes on the reflector concerning the SteppIR verticals. Earlier in the summer I ran a series of tests on the BigIR SteppIR to develop a ground system effective from 40m th
- /archives//html/Towertalk/2008-08/msg00327.html (7,109 bytes)
- 2. [TowerTalk] R7000 (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Mon, 15 Sep 2008 09:16:15 -0700
- Some multiband commercial verticals will work without a ground system. During my experiments earlier this year I tried an R7000 first with a large ground system and then removed the ground system. I
- /archives//html/Towertalk/2008-09/msg00277.html (6,821 bytes)
- 3. Re: [TowerTalk] R7000 (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Mon, 15 Sep 2008 19:52:33 -0700
- N2EA has it right! After I ran the test on the R7000 I had an exchange of notes with W1JR who was the original designer. He pointed out that there is no "other half of the dipole". It is loaded in su
- /archives//html/Towertalk/2008-09/msg00296.html (7,820 bytes)
- 4. [TowerTalk] vertical heights and radial lengths (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Sat, 4 Oct 2008 15:39:27 -0700
- A couple of weeks back there was a question on the reflector regarding the use of shorter radials with shorter verticals. This is an idea which has been "conventional knowledge" for a long time but I
- /archives//html/Towertalk/2008-10/msg00052.html (6,899 bytes)
- 5. [TowerTalk] Steppir antennas (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 4 Nov 2008 09:50:14 -0800
- I'd like to pass on my experience with several SteppIR antennas. Some years ago I won one of the original SteppIR dipoles at the NW DX convention. After using it for a while I moved on to one of the
- /archives//html/Towertalk/2008-11/msg00087.html (7,443 bytes)
- 6. [TowerTalk] Y radials (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 4 Nov 2008 12:02:37 -0800
- Some years ago I played a bit with "Y" radials and did some optimization, etc. I found that while they will work, the amount of wire saved wasn't enough to be worth the trouble. I didn't explore thes
- /archives//html/Towertalk/2008-11/msg00098.html (6,684 bytes)
- 7. [TowerTalk] anchoring to rock (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 11 Nov 2008 10:58:34 -0800
- My QTH is also built on solid rock which is only a foot or two under the soil. When I put up my two self-supporting towers (54' and 89') I dug down to the rock surface, drilled a number of 1-3/8 X 18
- /archives//html/Towertalk/2008-11/msg00276.html (6,794 bytes)
- 8. [TowerTalk] irrigation tubing (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 18 Nov 2008 11:21:33 -0800
- If you use the 4" irrigation tubing there is an option on the wall thickness. They sell what is called "torque tube" for use on the moving irrigation equipment. In the 4" size the wall thickness is i
- /archives//html/Towertalk/2008-11/msg00459.html (7,502 bytes)
- 9. [TowerTalk] slingshots (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Wed, 24 Dec 2008 09:51:04 -0800
- I have a Sherrill "BigShot" arborist's slingshot. www.sherrilltree.com I regularly use it to shoot a 16 oz spherical lead sinker (with fishline attached) over 100' plus trees. It's not cheap (about $
- /archives//html/Towertalk/2008-12/msg00597.html (6,747 bytes)
- 10. [TowerTalk] lines into trees (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Wed, 24 Dec 2008 10:37:32 -0800
- Most of the time I'm dealing with trees in a dense fir forest were I don't want to go over more multiple trees, just the one I want to put a support in. After many experiments I found that the lighte
- /archives//html/Towertalk/2008-12/msg00603.html (8,479 bytes)
- 11. [TowerTalk] Tower resonances and detuning (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 10 Feb 2009 10:11:46 -0800
- I'm trying to locate references to measuring tower resonances and detuning towers. I have the usual stuff in the ARRL Antenna Book, ON4UN's book and W8JI's web site but I wondered if anyone had done
- /archives//html/Towertalk/2009-02/msg00255.html (7,294 bytes)
- 12. Re: [TowerTalk] Tower resonances and detuning (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 10 Feb 2009 11:29:42 -0800
- Hi Rick, thanks. Actually the problem I'm looking at is a bit more fundamental: at what frequencies is a particular tower + antennas resonant at and how to do you determine this accurately? You would
- /archives//html/Towertalk/2009-02/msg00257.html (8,342 bytes)
- 13. [TowerTalk] tower resonances (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 10 Feb 2009 14:17:57 -0800
- I must apologize to the reflector for asking my original question in such a broad way when my interest is actually much narrower. Obviously there is a vast literature on tower detuning, especially re
- /archives//html/Towertalk/2009-02/msg00264.html (8,290 bytes)
- 14. [TowerTalk] tower resonances (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Tue, 10 Feb 2009 21:06:02 -0800
- Pattern distortion is one consideration Rick, but if you're talking about an array things get a lot worse. In an array, besides the obvious distortion possible from adding another element (a parasiti
- /archives//html/Towertalk/2009-02/msg00276.html (8,658 bytes)
- 15. [TowerTalk] tower resonances (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Wed, 11 Feb 2009 09:47:16 -0800
- Wow, I didn't realize this was such a hot topic! My interest is driven by a recent practical problem. I was helping a friend with a new 80m 4-square. He had done a wonderful job mechanically. The arr
- /archives//html/Towertalk/2009-02/msg00286.html (9,246 bytes)
- 16. [TowerTalk] tower resonances (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Thu, 12 Feb 2009 17:12:56 -0800
- Ok guys I've thrown some red meat onto my web site. If you want to see the notes on how I'm measuring tower resonances go to: www.antennasbyn6lf.com . 73, Rudy N6LF __________________________________
- /archives//html/Towertalk/2009-02/msg00293.html (7,923 bytes)
- 17. [TowerTalk] array matrix measurements (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Fri, 13 Feb 2009 09:16:57 -0800
- I've made these kinds of matrix measurements several times since I got my hands on a VNA. It's not too hard and actually a lot of fun. I've found that if I've been careful, the reciprocal measurement
- /archives//html/Towertalk/2009-02/msg00304.html (7,232 bytes)
- 18. Re: [TowerTalk] Tower resonance measurements (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Wed, 25 Feb 2009 09:48:37 -0800
- Hi Joe, To measure tower resonances, all I'm doing is measuring the series impedance of the sensing loop while it is attached to the tower. Without the tower the loop is just an inductor up to the po
- /archives//html/Towertalk/2009-02/msg00577.html (7,836 bytes)
- 19. [TowerTalk] Power poles (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Fri, 27 Feb 2009 08:48:56 -0800
- I use power poles quite often for antenna projects. In this part of the world there is lots of commercial logging activity so if the pole I want to manipulate is less that 70' or so, I just get a sel
- /archives//html/Towertalk/2009-02/msg00635.html (6,688 bytes)
- 20. Re: [TowerTalk] How close? (score: 1)
- Author: "Rudy Severns" <n6lf@arrl.net>
- Date: Thu, 12 Mar 2009 20:21:58 -0700
- To answer your question Pete you might want to read the new post on the subject of vertical-tower interactions on my web page: antennasbyn6lf.com. I'm afraid you will find the information rather depr
- /archives//html/Towertalk/2009-03/msg00282.html (7,099 bytes)
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