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Total 1524 documents matching your query.

261. [TowerTalk] What about hams with small lots??? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sat, 1 Sep 2001 19:22:52 -0400
The Gap antenna I had was just over 40 feet tall and covered 160- 20 meters. It only used three radials (counterpoises). Are you sure the 160 model is a Voyager? Challenger sticks in my mind. It was
/archives//html/Towertalk/2001-09/msg00035.html (10,452 bytes)

262. [TowerTalk] What about hams with small lots??? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 2 Sep 2001 13:50:52 -0400
A length of coaxial cable, used to generate a reactance, is about the worse thing possible anyone could ever use. Not only is the conductor length long and generally thin, it does not even have unif
/archives//html/Towertalk/2001-09/msg00054.html (11,636 bytes)

263. [TowerTalk] What about hams with small lots??? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 2 Sep 2001 13:50:53 -0400
That is an excellent system for a restricted lot, especially if you drop the feedline straight down to earth and put in a good ground system (or the best ground system you can do). You can cover all
/archives//html/Towertalk/2001-09/msg00055.html (10,585 bytes)

264. [TowerTalk] True or Not True? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sun, 2 Sep 2001 13:50:52 -0400
With a half-wave dipole...some radiation comes from near the outer ends, because obviously there is some current at the ends. Most of the radiation comes from the middle, however, since most of the
/archives//html/Towertalk/2001-09/msg00056.html (9,264 bytes)

265. [TowerTalk] radial geometry (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 3 Sep 2001 20:49:38 -0400
If you can't go through the crawl or basement, just go around the house with a heavy buss strap or wire. Pick up on the other side if you can. Radial geometry mostly affects overall efficiency, NOT
/archives//html/Towertalk/2001-09/msg00115.html (8,865 bytes)

266. [TowerTalk] How accurate is EZNEC? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 6 Sep 2001 07:19:59 -0400
Hi Richard, EZNEC, like any other modeling program, is a tool. The results we get with any tool depend on how well we understand how to use the tool. This especially includes modeling phased systems,
/archives//html/Towertalk/2001-09/msg00204.html (10,795 bytes)

267. [TowerTalk] Resonance of loaded Parasitic Elements (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 6 Sep 2001 11:35:08 -0400
Hi Kevin, If you model a single element in space, you will find it makes an almost ideal reflector at normal spacings when it is self-resonant. You want to be sure to do that at the LOWEST frequency
/archives//html/Towertalk/2001-09/msg00218.html (9,533 bytes)

268. [TowerTalk] Re: [AMPS] True Or Not True #2 (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 6 Sep 2001 21:50:38 -0400
Even 1dB is a huge increase when copying a signal near noise. The error rate changes considerably here when working CW, when I pick antennas that offer even 1dB more S/N ratio. Most S meters are in
/archives//html/Towertalk/2001-09/msg00261.html (9,479 bytes)

269. [TowerTalk] Quad Element Tuning (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sat, 8 Sep 2001 08:48:14 -0400
If you set the reflector to the lowest possible frequency you plan on using the antenna on without a driven element nearby, it will be set at the frequency where F/B really starts to roll off fast.
/archives//html/Towertalk/2001-09/msg00305.html (10,516 bytes)

270. [TowerTalk] Remote Switch (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 10 Sep 2001 07:47:24 -0400
If you have anywhere over one volt on all the pins you most likely have an open ground between the relay box and the RCS-8 control unit. The other option is all the leads are shorted, and that is un
/archives//html/Towertalk/2001-09/msg00358.html (7,572 bytes)

271. [TowerTalk] Delta (Quad) Loop Polarization (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 10 Sep 2001 07:47:24 -0400
Hi Yuri, The reason you see that "dual polarization" is because Eznec only considers the polarization as two pure distinct polarizations. When you have a tilted wave, it shows up as a mixture of V a
/archives//html/Towertalk/2001-09/msg00359.html (9,720 bytes)

272. [TowerTalk] Delta (Quad) Loop Polarization (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 10 Sep 2001 13:16:39 -0400
Hi Chris, They are equivalent in the model for arriving at a field vector that is considered with phase and amplitude broken into two distinct parts (useful for calculating the combined pattern). It
/archives//html/Towertalk/2001-09/msg00367.html (8,304 bytes)

273. [TowerTalk] Remote Switch reply (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Sep 2001 20:44:59 -0400
In almost any installation the wire gauge is limited by mechanical worries, and not conductor size. 2500 feet of number 20 copper is still good as long as it isn't broken someplace along the way. 73
/archives//html/Towertalk/2001-09/msg00410.html (7,730 bytes)

274. [TowerTalk] Testing traps for heating (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Sat, 15 Sep 2001 20:51:34 -0400
I've been slack at getting my tests on my web page, but I've already done this. You need to either have an accurate impedance measuring system, or series tune the trap with a negligible loss device
/archives//html/Towertalk/2001-09/msg00470.html (8,965 bytes)

275. [TowerTalk] Dipping with 259B and such (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 17 Sep 2001 08:08:57 -0400
In my opinion, there is NO "better way" to build a dip meter with an antenna analyzer. The sensitivity will never be good. The reason sensitivity is poor is because the coupling inductor has very li
/archives//html/Towertalk/2001-09/msg00492.html (9,838 bytes)

276. [TowerTalk] Re: Dipping with 259B and such (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 17 Sep 2001 15:50:48 -0400
The 259B has a detector right across the output port that measures voltage there, as well as a detector that measures current in series with the output port (which is what the described detector mea
/archives//html/Towertalk/2001-09/msg00504.html (9,907 bytes)

277. [TowerTalk] Re: Dipping with 259B and such (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 18 Sep 2001 09:56:30 -0400
Hi Charlie and All, First let me say I spent weeks on this years ago, at the request of a manufacturer who paid for the time. The goal was to evaluate the article in QST. But what the heck, I could h
/archives//html/Towertalk/2001-09/msg00519.html (10,892 bytes)

278. [TowerTalk] Shortened Dipole on 160M (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 19 Sep 2001 11:37:51 -0400
Hi All, This idea does not work for wide-band frequency changes as claimed: Using an inverted L for 80 meters, with the L cut for band center at 160 ohms resistance, and fed through 17 meters of RG-7
/archives//html/Towertalk/2001-09/msg00547.html (10,301 bytes)

279. [TowerTalk] Polyphaser protectors (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 24 Sep 2001 04:45:32 -0400
I don't know how anyone can tell for sure anyway. I DON'T have any specialized lightning gaps or arrestors, I only use grounding that is properly installed and a pair of MOV's on the power line. Wha
/archives//html/Towertalk/2001-09/msg00641.html (8,554 bytes)

280. [TowerTalk] Salt Water, How far is too far? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 24 Sep 2001 04:45:32 -0400
Excluding groundwave, which we are not generally interested in, there are two regions where salt water can help. The first and the only major effect is close to the antenna in the direction of propa
/archives//html/Towertalk/2001-09/msg00642.html (8,545 bytes)


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