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Total 1524 documents matching your query.

321. [TowerTalk] Horizontal loop and balun (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 20 Jul 2001 20:23:18 -0400
A choke balun cares less if the load is reactive, only voltage baluns (like the W2FMI style) are load impedance critical. Placing a choke balun at the input of a tuner does nothing for balancing of
/archives//html/Towertalk/2001-07/msg00342.html (9,640 bytes)

322. [TowerTalk] Horizontal loop and ladderline project (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 20 Jul 2001 20:23:18 -0400
Brian brings up an excellent point. I don't want to discourage anyone from using a loop because they do have the advantage of being easy to feed, but gain is overrated! Brian sez: I certainly agree!
/archives//html/Towertalk/2001-07/msg00343.html (11,138 bytes)

323. [TowerTalk] Routing cables - tower to shack (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 20 Jul 2001 22:44:36 -0400
Hi Mike, Think about what the goal is. You want everything to move up together at the same rate. The big problem is when there is a potential difference between different things. If my feedline pass
/archives//html/Towertalk/2001-07/msg00346.html (9,816 bytes)

324. [TowerTalk] 80m Yagis -- Too Tough to Tame? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 22 Jul 2001 18:22:46 -0400
I wonder why anyone bothers with a 80 meter yagi, especially a linear loaded yagi, when it is so simple just to install a couple reversible wire beams or phased arrays. The only case I can see where
/archives//html/Towertalk/2001-07/msg00396.html (9,664 bytes)

325. [TowerTalk] 80m Yagis -- Too Tough to Tame? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 22 Jul 2001 21:30:50 -0400
The secret is the height, not the antenna. I always wonder though why so many manufacturers use linear loading. 73, Tom W8JI W8JI@contesting.com List Sponsor: Are you thinking about installing a tow
/archives//html/Towertalk/2001-07/msg00400.html (9,571 bytes)

326. [TowerTalk] Lightning Observation (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 22 Jul 2001 22:41:40 -0400
Hi Ford, A large part of the problem is because once an arc is started, a very much lower voltage sustains the arc. Sometimes a breaker actually has to open and reset to stop the system from arcing.
/archives//html/Towertalk/2001-07/msg00404.html (7,921 bytes)

327. [TowerTalk] 80M dipoles/height gain (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 23 Jul 2001 10:34:16 -0400
Modelling prompted me to install a 318 ft tower, and that probably was one of the worse investments I ever made. But hey, if you don't try one you never know. Don't sell a vertical short without try
/archives//html/Towertalk/2001-07/msg00415.html (8,852 bytes)

328. [TowerTalk] Routing Cables - Tower to shack (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 23 Jul 2001 10:34:16 -0400
The main advantage of the earth is the cable is tightly coupled to earth around the cable, and is very unlikely to have much potential difference between it and earth from distant strikes. Put simpl
/archives//html/Towertalk/2001-07/msg00416.html (10,768 bytes)

329. [TowerTalk] Routing Cables - Tower to shack (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 23 Jul 2001 20:42:29 -0400
That is generally the case, the exception would be if the shield had a high resistance or open connection...or of course if you had a large antenna hanging on the cable that was not balanced for DC.
/archives//html/Towertalk/2001-07/msg00434.html (9,387 bytes)

330. [TowerTalk] 80M dipoles/height gain (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 23 Jul 2001 20:42:29 -0400
Hi Tom, Hi Tom, How far are you verticals from other vertical metallic structures, and have you checked the patterns? How good are your ground and feed systems? How traditional are your verticals? 73
/archives//html/Towertalk/2001-07/msg00435.html (7,905 bytes)

331. [TowerTalk] 80M dipoles/height gain (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 24 Jul 2001 09:45:07 -0400
Hi Tom, Like most cases, the installation is too complex to tell what is causing what. Even without any measurements, we know that is a situation where more than one "antenna" radiates significantly
/archives//html/Towertalk/2001-07/msg00453.html (8,745 bytes)

332. [TowerTalk] tieing utility and tower grounds together (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 24 Jul 2001 11:23:46 -0400
Just be sure the copper strap is not braided or woven, especially if it is subject to weather! Use solid smooth copper flashing for all important grounds! 73, Tom W8JI W8JI@contesting.com List Spons
/archives//html/Towertalk/2001-07/msg00457.html (8,308 bytes)

333. [TowerTalk] Adjustable Phase Shift networks (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 25 Jul 2001 19:50:00 -0400
Hi Mel, There are a dozen solutions, but remember these rules. If you use transmission lines: A *mismatched* feedline only shifts phase the amount of the length when the line is an exact electrical m
/archives//html/Towertalk/2001-07/msg00478.html (9,543 bytes)

334. [TowerTalk] coax as capacitor (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 26 Jul 2001 03:22:32 -0400
Is it feasible to use coaxial cable as the series capacitor in a Assuming a cable no more than 1/4 wl long: The cable always looks like more capacitance than it measures at dc Pete, because any *ser
/archives//html/Towertalk/2001-07/msg00490.html (9,095 bytes)

335. [TowerTalk] coax as capacitor (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 26 Jul 2001 08:51:14 -0400
True enough. That's a good suggestion! If you parallel enough cables it starts to look like a regular capacitor...and behave like one. Loss decreases and capacitance is less frequency critical. 73,
/archives//html/Towertalk/2001-07/msg00497.html (7,650 bytes)

336. [TowerTalk] Wood posts (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 26 Jul 2001 08:58:16 -0400
I'm planning on using pressure treated 2x4's to support some Beverages. I'll just poke some holes in the ground with my tractor's post hole digger attachment, and drop the 2x4's in. Does anyone have
/archives//html/Towertalk/2001-07/msg00498.html (7,822 bytes)

337. [TowerTalk] finest tuners and switches (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 27 Jul 2001 12:48:01 -0400
Hi Tom, Inside photos would be nice. I don't know why every manufacturer doesn't do that. Is this tuner built with new parts, surplus parts, or used parts? It looks sorta surplus, with the big knife
/archives//html/Towertalk/2001-07/msg00550.html (8,467 bytes)

338. [TowerTalk] Optimum Stacking Distance (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 27 Jul 2001 17:16:56 -0400
Bill sure has it right. We should always model the antennas to pick stacking distance! We used to do this on paper before it was common to use personal computers to model antennas. You can do somethi
/archives//html/Towertalk/2001-07/msg00567.html (10,937 bytes)

339. [TowerTalk] Optimum Stacking Distance (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 27 Jul 2001 22:27:58 -0400
Hi Yuri, No. They are not directly related. What if I stacked two dish antennas? What is the boom length of a dish? For example, your own super 10dB-over-a- 5-element-yagi-superrazor beam antenna wou
/archives//html/Towertalk/2001-07/msg00581.html (9,708 bytes)

340. [TowerTalk] Optimum Stacking Distance (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Fri, 27 Jul 2001 22:27:58 -0400
I didn't intend to start an argument, just to point out HOW it works. Some people like to know how or why something happens, some people like to just plod along clueless about how or why things work
/archives//html/Towertalk/2001-07/msg00582.html (10,068 bytes)


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