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1. Re: [TowerTalk] Variation of Vertical T (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 24 Nov 2009 10:59:19 -0800; As Wes N5WA pointed out, coupling to your tower could be a real issue. It sounds like the height of your tower, plus the capacitive loading of the 40m yagi, could make it resonant near 160m. With fur; /archives//html/Towertalk/2009-11/msg00434.html (9,955 bytes)
2. Re: [TowerTalk] Vertical dipoles (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Sat, 21 Nov 2009 10:30:45 -0800; I can see what Jerry K4SAV is talking about. Using a 45 foot vertical wire and four 65 foot hat wires indicated by EI7BA, resonance is around 2.36 MHz in my EZNEC model. This varies somewhat dependin; /archives//html/Towertalk/2009-11/msg00391.html (11,884 bytes)
3. Re: [TowerTalk] 3/8 Wave Vertical Questions (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 17 Nov 2009 11:19:58 -0800; Larry, The high current point will be very close to 1/4 wl from the open end of the inverted L, for any configuration whose length exceeds 1/4 wl. However, although increasing the length of an invert; /archives//html/Towertalk/2009-11/msg00299.html (9,553 bytes)
4. Re: [TowerTalk] Director vs reflector (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Fri, 09 Oct 2009 12:35:46 -0700; John, The configuration with the director generally has better performance, but only at closer spacings. Unfortunately, the trade-off with close spacing is lower feed Z and a similarly reduced bandwi; /archives//html/Towertalk/2009-10/msg00052.html (8,884 bytes)
5. Re: [TowerTalk] TL antenna ? (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Thu, 08 Oct 2009 16:19:37 -0700; This is a nice antenna with a direct match to 50 ohms. Using AL7KK's dimensions and bare #12 copper wire, an EZNEC model shows 0.44 dBi gain at 19.5 degrees above the horizon over "average" ground. T; /archives//html/Towertalk/2009-10/msg00048.html (9,676 bytes)
6. Re: [TowerTalk] Radials tied to ground: good or bad? (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Mon, 16 Mar 2009 15:39:20 -0700; I don't have any personal data to validate this, but W8JI, N6BT and others have claimed that verticals with modest numbers of low elevated radials have increased losses when there is also a path to e; /archives//html/Towertalk/2009-03/msg00431.html (9,320 bytes)
7. Re: [TowerTalk] Phased Vertical Follow-up (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Sat, 14 Mar 2009 16:55:59 -0700; The phasing section of this document has been around since the 1960's, if not before. It was developed long before most hams found out about the interesting effects of mutual coupling on the feed imp; /archives//html/Towertalk/2009-03/msg00365.html (7,827 bytes)
8. Re: [TowerTalk] phasing multiband verticals (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 10 Mar 2009 16:32:09 -0700; I think one reason that hams would rather put the phasing network close to the antenna elements is that the pattern bandwidth is almost always better the closer these networks are to the antenna elem; /archives//html/Towertalk/2009-03/msg00236.html (9,399 bytes)
9. Re: [TowerTalk] cage dipole (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 03 Mar 2009 13:24:04 -0800; A cage dipole has essentially the same gain (and pattern) as a regular dipole. The bandwidth increase is real, but those claims of 5 dBd gain are totally bogus. 73, Terry N6RY _______________________; /archives//html/Towertalk/2009-03/msg00066.html (7,414 bytes)
10. Re: [TowerTalk] 43' Vertical - Feed Point Tuner or Shack Tuner? (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Fri, 06 Feb 2009 12:17:56 -0800; It would appear that the SWR curve that is still on the Array Solutions web site was measured with a misapplied 4:1 voltage balun (which puts half of the antenna RF voltage on the outside of the coax; /archives//html/Towertalk/2009-02/msg00114.html (10,220 bytes)
11. Re: [TowerTalk] Inverted L Tuning Question (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Fri, 05 Dec 2008 16:36:57 -0800; This is a great article on dealing with practical problems in measurement and matching. Thanks for making it available, Jay. The use of a hairpin match is, by far, my favorite method of matching impe; /archives//html/Towertalk/2008-12/msg00121.html (7,580 bytes)
12. Re: [TowerTalk] Inverted L Tuning Question (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Fri, 05 Dec 2008 10:56:26 -0800; Isn't it about time to split off an "All Inverted L's, All the Time", e-mail group? Same questions, same 100 answers each as the last 100 times. 73, Terry N6RY _______________________________________; /archives//html/Towertalk/2008-12/msg00089.html (8,089 bytes)
13. Re: [TowerTalk] quad questions (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Wed, 03 Dec 2008 12:26:21 -0800; Jim, My models show that a 2 wl square loop will have a feed Z of around 270-300 ohms. This is the case for a single loop and also for a concentric loop around a 1 wl loop with both fed in phase from; /archives//html/Towertalk/2008-12/msg00056.html (9,409 bytes)
14. Re: [TowerTalk] Quad questions, long(ish) (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 02 Dec 2008 10:28:06 -0800; Whether you short a nearby 2 wl quad element or leave it open, it will still be resonant and carry a fair amount of current. I think the benefit of shorting the element is that the currents are symme; /archives//html/Towertalk/2008-12/msg00026.html (8,074 bytes)
15. Re: [TowerTalk] Flagpole and Stealth Antenna (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Mon, 24 Nov 2008 16:57:17 -0800; Joe, I have used a Force12 flagpole vertical for several years now, which has HOA approval. The stock F12 flagpole is 16 feet of 2" diameter aluminum, painted white, but I got it with 3 extra section; /archives//html/Towertalk/2008-11/msg00679.html (10,709 bytes)
16. Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Thu, 20 Nov 2008 16:44:04 -0800; Perhaps there is a question of semantics to say that a 0.08 wavelength vertical, which has about a 2.5 ohm radiation resistance, qualifies as a "fairly good" antenna on 160m? With a 5 ohm ground syst; /archives//html/Towertalk/2008-11/msg00508.html (9,669 bytes)
17. Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Thu, 20 Nov 2008 09:48:46 -0800; Michael, You've probably gotten lots of comments on this, but I'll throw in mine, too. As far as the balun vs. unun issue, it probably doesn't matter too much. You're right that both the antenna and; /archives//html/Towertalk/2008-11/msg00497.html (11,889 bytes)
18. Re: [TowerTalk] wire antenna question (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Thu, 13 Nov 2008 16:01:35 -0800; Blair is right that a 40+j10 ohm load has an impedance magnitude is 41.23 ohms, but it has a vector angle of 14 degrees. The SWR is only the simple ratio of the impedances when the vector angle is 0; /archives//html/Towertalk/2008-11/msg00347.html (10,135 bytes)
19. Re: [TowerTalk] wire antenna question (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Thu, 13 Nov 2008 09:35:13 -0800; Blair, Even if the resonant Z was under 50 ohms, adding reactance of either sign will still increase the SWR. If you have the TLW program from the ARRL Antenna Book, you can put in test values to see; /archives//html/Towertalk/2008-11/msg00340.html (8,525 bytes)
20. Re: [TowerTalk] Finding True North (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 11 Nov 2008 17:21:50 -0800; But do you have to get Russian girls for Canadian men (as it says on your photo page) in order to keep your owl in residence? 73, Terry _______________________________________________ _______________; /archives//html/Towertalk/2008-11/msg00286.html (10,283 bytes)

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