Mail Archive Search: <+from:W8JI@contesting.com>

Results:

References: [ +from:W8JI@contesting.com: 1524 ]

Total 1524 documents matching your query.

241. [TowerTalk] loss resistance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Oct 2001 10:15:41 -0400; It may not be 7 ohms Pete. It is a mistake to simply assume the deviation you see from a certain feed impedance directly translates to loss. In order to sort loss resistance from radiation resistanc; /archives//html/Towertalk/2001-10/msg00296.html (9,247 bytes)
242. [TowerTalk] Voltage vs Current feed (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Oct 2001 10:50:24 -0400; You will have a difficult time finding those terms in engineering text because they are general jargon or builder's slang, rather than actual "systems or methods" with some particular engineering ad; /archives//html/Towertalk/2001-10/msg00297.html (8,921 bytes)
243. Fw: [TowerTalk] Voltage vs Current feed (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Oct 2001 10:50:24 -0400; The term node is misused often in Ham radio. A node is defined as ""A point in a standing wave (stationary wave) where the amplitude of the wave is a minimum" (Communications Standard Dictionary and; /archives//html/Towertalk/2001-10/msg00298.html (8,550 bytes)
244. [TowerTalk] Voltage vs Current feed (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 15 Oct 2001 20:17:41 -0400; That's all right as far as I could see except current never really is absolutely zero at the ends because there is still coupling off the end into the electric energy storage field. You start at the; /archives//html/Towertalk/2001-10/msg00311.html (9,788 bytes)
245. [TowerTalk] Viking KW matchbox. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Oct 2001 03:40:55 -0400; I have several of them, they were all around $150-200. They certainly are a reasonably good tuner, but keep in mind there are now at least two T-network tuners available that handle just as much or; /archives//html/Towertalk/2001-10/msg00328.html (9,005 bytes)
246. [TowerTalk] Viking KW matchbox. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Oct 2001 21:08:21 -0400; I'm guessing the reason is a combination of cost and performance. Although there is a nitch market, once that is filled the sales would probably die. Factually, that circuit costs much more to build; /archives//html/Towertalk/2001-10/msg00349.html (8,728 bytes)
247. [TowerTalk] Stacking quandry (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 19 Oct 2001 19:52:07 -0400; Jerry and all, The warnings are correct. The phase shift in dissimilar antennas (or dissimilar tuned antennas) is a big problem. Any prediction you will never get phase "correct" is not necessarily; /archives//html/Towertalk/2001-10/msg00368.html (10,871 bytes)
248. [TowerTalk] RE: Crappy PL259's (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Oct 2001 11:28:12 -0400; When I do solder connectors to the shield, I use a big soldering gun and hit the connector near the holes with a grinder or file before soldering. I never have a problem soldering when I do that, no; /archives//html/Towertalk/2001-10/msg00435.html (8,993 bytes)
249. [TowerTalk] Beverage f/b (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Oct 2001 11:28:12 -0400; Look at the ground connections. A single driven rod is almost never enough. The type of two-wire Beverage having one wire directly grounded has less directivity and F/B than one with proper transfor; /archives//html/Towertalk/2001-10/msg00436.html (9,747 bytes)
250. [TowerTalk] Beverage f/b (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Oct 2001 11:36:10 -0400; There are times when DX signals are scattered, making directivity next to useless...but only rare occasions and generally during severe geomagnetic storms. Something else must be going on, unless yo; /archives//html/Towertalk/2001-10/msg00437.html (7,777 bytes)
251. [TowerTalk] RE: Crappy PL259's (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Oct 2001 22:57:03 -0400; A BNC connector is dimensionally very similar to a 50 ohm N connector in the current carrying parts and spacing. As a matter of fact, if you grind off the locking bayonet, you can use BNC males as a; /archives//html/Towertalk/2001-10/msg00450.html (10,099 bytes)
252. [TowerTalk] RE: Crappy PL259's (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Oct 2001 23:38:15 -0400; If you lay the connector in a pile of plates from an old 365pF broadcast variable while soldering, it will stop the foam spillover. Of course laying it on a wet sponge also works. 73, Tom W8JI W8JI@; /archives//html/Towertalk/2001-10/msg00452.html (9,708 bytes)
253. [TowerTalk] vertical antennas (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Oct 2001 20:41:18 -0400; That is an unfounded old Ham's tale, just like the idea that two or four elevated radials is enough. (Four radials are enough if they are a hundred feet or more above ground on 160). This was all me; /archives//html/Towertalk/2001-10/msg00475.html (10,367 bytes)
254. [TowerTalk] RE: Crappy PL259's (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Oct 2001 20:41:19 -0400; The key is always having a clean fresh surface to solder, preferably freshly pre-tinned. If you are worried about melting the dielectric, keep a wet sponge handy and use a BIG iron or gun! Solder ea; /archives//html/Towertalk/2001-10/msg00476.html (10,278 bytes)
255. [TowerTalk] Underwater coax (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Oct 2001 20:54:56 -0400; I dislike 9913 (I think that is what it was) because the stuff I have is hollow and fills with water no matter how you seal it when horizontal. I wound up using it only for vertical runs that don't; /archives//html/Towertalk/2001-10/msg00477.html (8,112 bytes)
256. [TowerTalk] vertical antennas (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 24 Oct 2001 08:32:45 -0400; Other problems are with small elevated systems, even at great height, you need to choke RF off the OUTSIDE of the feedline or efficiency suffers. You can NOT have a path to earth for RF, and that me; /archives//html/Towertalk/2001-10/msg00489.html (9,803 bytes)
257. [TowerTalk] vertical antennas (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 24 Oct 2001 20:31:35 -0400; Unfortunately you will read all sorts of unreliable things when the data is not peer reviewed. While most of the information is well intentioned, the fact is most of the data is never based on accur; /archives//html/Towertalk/2001-10/msg00502.html (10,433 bytes)
258. [TowerTalk] Vertical ground radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 25 Oct 2001 11:39:00 -0400; It won't make any difference at all one way or another. The 120 radial myth is mostly based on folklore, and misunderstanding of what the FCC suggests....not on measurements. The FCC suggests using; /archives//html/Towertalk/2001-10/msg00516.html (8,930 bytes)
259. [TowerTalk] vertical antennas (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 25 Oct 2001 11:39:00 -0400; With elevated radials, ANY path to earth for RF is a problem that reduces efficiency. This was one of the things that was claimed in the original elevated radial article that I verified. I was actua; /archives//html/Towertalk/2001-10/msg00517.html (11,272 bytes)
260. [TowerTalk] What about hams with small lots??? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 1 Sep 2001 14:13:27 -0400; If you look at comparisons or honest reviews of small antennas for 160 (or 80) meters, the most efficient ones are universally top loaded with some form of large hat or wire and employ reasonably lar; /archives//html/Towertalk/2001-09/msg00024.html (11,396 bytes)

Current List: 241 - 260
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]