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161. [TowerTalk] Re: Non-traditional antenna designs (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 29 Jan 2002 15:29:58 -0500
I certainly agree with almost everything you say. I'd never trust a review from CQ Magazine, no matter who the author is, because CQ has no technical editing or safeguards. Do you think that N6BT's
/archives//html/Towertalk/2002-01/msg00622.html (9,275 bytes)

162. [TowerTalk] Re: Non-traditional antenna designs (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 29 Jan 2002 20:54:24 -0500
I don't have any idea - I ain't a technical antenna guy. All I I can't recall what month and year that was, and I don't want to bother looking it up. I seen to recall it had a bit of hyperbole in it
/archives//html/Towertalk/2002-01/msg00628.html (8,534 bytes)

163. [TowerTalk] Dielectric losses (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 30 Jan 2002 08:59:50 -0500
Dielectric losses in typical coaxial cables do not contribute significantly to loss at HF. The primary loss mechanism is conductor loss. The reason various dielectrics might *seem* to produce differ
/archives//html/Towertalk/2002-01/msg00638.html (8,444 bytes)

164. [TowerTalk] Dielectric losses (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 31 Jan 2002 06:27:31 -0500
Of course it does. No one said it doesn't. The reason the power rating changes is some dielectrics have lower voltage ratings, and some allow the use of a larger center conductor for a given power.
/archives//html/Towertalk/2002-01/msg00666.html (13,673 bytes)

165. [TowerTalk] 3/8 fiberglass guys (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 31 Jan 2002 17:39:58 -0500
I'd be interested in several thousand feet and some grips. I live near Macon Georgia just near I-75. 73, Tom W8JI W8JI@contesting.com ________________________________________________________________
/archives//html/Towertalk/2002-01/msg00679.html (7,893 bytes)

166. [TowerTalk] HEX-BEAM discussion group formed (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 3 Dec 2001 15:17:53 -0500
What is a "controlled field concept"? What is considered "remarkable performance"? As I understand it, the Hex Beam has about 3dB gain. That seems reasonable and appropriate for a small beam antenna
/archives//html/Towertalk/2001-12/msg00058.html (7,709 bytes)

167. [TowerTalk] Fwd: KYTV, Channel 3 - Springfield, MO - Television tower topples] (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 5 Dec 2001 09:51:54 -0500
You can bet if you see a guyed tower laying over like a "cut tree", something was wrong with the guying. Even a tower guyed at one level will fold and fall, if the guys are properly installed and ma
/archives//html/Towertalk/2001-12/msg00089.html (8,615 bytes)

168. [TowerTalk] feeding the tower for 160 (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 5 Dec 2001 16:49:43 -0500
You should use as many radials as possible. They must connect to the tower. The feedlines and control cables must exit at ground level. The guy lines must be insulated. The coax shield can connect t
/archives//html/Towertalk/2001-12/msg00105.html (7,603 bytes)

169. [TowerTalk] RF Ground (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 5 Dec 2001 16:49:42 -0500
Hi George, I think "Ask the Doctor", in QST, gave an incorrect answer to the very same question you are asking. I *think* they said if you flattened the conductor, the resistance would decrease, but
/archives//html/Towertalk/2001-12/msg00106.html (8,847 bytes)

170. [TowerTalk] Tall (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Mon, 10 Dec 2001 10:36:36 -0500
There is no height limit for amateur antenna Jerry, just a limit where paperwork must be filed with the FCC (and FAA) telling them "hey I'm installing a tower" and have them bless it. They send you
/archives//html/Towertalk/2001-12/msg00216.html (8,797 bytes)

171. [TowerTalk] Best wire (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Dec 2001 11:58:34 -0500
The last thing in the world you want for an antenna wire is a woven wire. It is a problem for RF resistance (although I can't say how much of a problem) and most likely for overall life. The vast ma
/archives//html/Towertalk/2001-12/msg00250.html (9,642 bytes)

172. [TowerTalk] ++ High SWR and Modern Transceivers (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Dec 2001 12:48:33 -0500
Actually transmitters are energy conversion devices. Maximum available power capability that does not reach the antenna does not necessarily turn to heat. As a matter of fact a mismatch just as ofte
/archives//html/Towertalk/2001-12/msg00252.html (11,923 bytes)

173. [TowerTalk] ++ High SWR and Modern Transceivers (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Dec 2001 13:07:33 -0500
Woops, the results are correct but I described the impedance wrong. In this case the surge impedance of the network would be the geometric mean of the input and output impedance. Phase shift would b
/archives//html/Towertalk/2001-12/msg00254.html (9,487 bytes)

174. [TowerTalk] ++ High SWR and Modern Transceivers (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Dec 2001 18:15:57 -0500
I hope they do grasp the correct concept, then all the folklore about SWR and what makes transmitters and tuners hot will cool off. The only thing SWR does for certain, at least in the systems we ar
/archives//html/Towertalk/2001-12/msg00263.html (9,467 bytes)

175. [TowerTalk] Best wire (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Tue, 11 Dec 2001 19:15:04 -0500
I'll second Phil's remarks. Just don't kink it! 73, Tom W8JI W8JI@contesting.com List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more.
/archives//html/Towertalk/2001-12/msg00266.html (8,679 bytes)

176. [TowerTalk] ++ High SWR and Modern Transceivers (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 12 Dec 2001 06:59:52 -0500
I wasn't answering your question, because no one can answer it. The only answer is if it didn't blow up, it is probably OK. I wouldn't run a rig without an adjustable matching system into a high SWR
/archives//html/Towertalk/2001-12/msg00276.html (9,284 bytes)

177. [TowerTalk] ++ High SWR and Modern Transceivers (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 12 Dec 2001 11:15:27 -0500
I think that sums it up pretty well, except to say voltage is generally limited by the operating Q of any resonant circuits (they can ring) AND the design of the PA. With class AB or A PA's in push
/archives//html/Towertalk/2001-12/msg00284.html (9,481 bytes)

178. [TowerTalk] Perpetum Mobile (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Wed, 12 Dec 2001 15:00:11 -0500
Even an FT1000MP, with all its annoying unnecessary keyclicks, takes a millisecond to reach full power. That's 1800 RF cycles to reach full output on the lowest amateur band. Things change slow in o
/archives//html/Towertalk/2001-12/msg00290.html (8,930 bytes)

179. [TowerTalk] Color code coax lines? (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 13 Dec 2001 13:57:28 -0500
Use two or more color tapes on each cable if necessary, just like Steve suggested! All of my mess is color coded or I'd be totally lost. I start with NE (since all my antennas default to NE, vertica
/archives//html/Towertalk/2001-12/msg00329.html (9,617 bytes)

180. [TowerTalk] Front to Back Measurements (score: 1)
Author: W8JI@contesting.com (Tom Rauch)
Date: Thu, 13 Dec 2001 13:57:28 -0500
MFJ sells a push-button step-attenuator (I designed it) that has 1 dB steps up to 81 dB. It uses surface mount components and 0.5% chip resistors on a groundplane double sided board with BNC connecto
/archives//html/Towertalk/2001-12/msg00330.html (9,335 bytes)


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