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181. Re: [TowerTalk] have one of these? (score: 1)
Date: Fri, 18 Jun 2004 16:01:10 -0400 (EDT)
Ron [& all} I have a TET 3-el 40m yagi in my yard that has NEVER been up in the air, but is assembled [getting tired of moving it to mow!] It has a director and two driven elements. A bit heavy .. ab
/archives//html/Towertalk/2004-06/msg00399.html (9,488 bytes)

182. Re: [TowerTalk] Re: [FCG] HF LOG-PERIODIC ANTENNAS Comments Please (score: 1)
Author: Don Havlicek <>
Date: Tue, 22 Jun 2004 19:49:13 -0500
The 'original' design of the LPDA [Dr. Duhamel - Collins Radio] used TWO sections in an 'arrow' configuration .. that is .. the longer elements were 'stacked' considerably farther apart than the shor
/archives//html/Towertalk/2004-06/msg00476.html (27,954 bytes)

183. Re: [TowerTalk] beam antenna patterns; groundwave (score: 1)
Author: Don Havlicek <>
Date: Sat, 26 Jun 2004 14:31:44 -0500
How, pray tell, did you calculate 6 db f/b on a VERTICAL? ... Did you rotate it? Any WHY? Don N8DE Jim Jarvis wrote: Folks, While I agree with Tom, in theory, that all manner of localized effects can
/archives//html/Towertalk/2004-06/msg00589.html (8,750 bytes)

184. Re: [TowerTalk] Vertical Base Insulators (score: 1)
Date: Fri, 2 Jul 2004 12:17:48 -0400 (EDT)
Dan, My comments are inserted below: This works OK, provided mechanical strength is sufficient. Low voltage point in most respects, so a large 'gap' is not required. Any material which will not break
/archives//html/Towertalk/2004-07/msg00028.html (10,131 bytes)

185. Re: [TowerTalk] Identify this tower (score: 1)
Author: Don Havlicek <>
Date: Thu, 15 Jul 2004 18:10:47 -0500
Bill, IF the tower is aluminum, it's probably UNIVERSAL tower. If it's steel ... I HAVE NO IDEA! Don N8DE William H. O'Hara III wrote: Is anyone familiar with a tapered tower design with zig zig cros
/archives//html/Towertalk/2004-07/msg00461.html (8,804 bytes)

186. Re: [TowerTalk] Rohn Torque Bar confusion (score: 1)
Author: Don Havlicek <>
Date: Tue, 03 Aug 2004 15:47:03 -0500
I may be incorrect, but I am under the impression that, when using 'torque bars', the guy anchors are placed in a position that makes the tower face towards the anchor point. This allows double guys
/archives//html/Towertalk/2004-08/msg00062.html (12,090 bytes)

187. Re: [TowerTalk] Info abt. KT34XA plus 2el 40m same boom? (score: 1)
Author: Don Havlicek <>
Date: Sun, 15 Aug 2004 18:50:46 -0500
One other choice .... you can suspend the 40m elements below the KLM boom .. using two pieces of aluminum angle ... and some U-bolts to fit. A Gamma match would preclude needing to insulate the drive
/archives//html/Towertalk/2004-08/msg00274.html (8,825 bytes)

188. Re: [TowerTalk] Antenna switch matrices (score: 1)
Author: Don Havlicek <>
Date: Tue, 17 Aug 2004 16:02:40 -0500
Eric, I custom design and build just such devices. Most use 26v dc relays and rotary switches [pushbutton switches have a much higher failure rate] Bids sent upon receipt of specific needs. Don N8DE
/archives//html/Towertalk/2004-08/msg00348.html (11,071 bytes)

189. Re: [TowerTalk] wires in quad driven element (score: 1)
Author: Don Havlicek <>
Date: Mon, 23 Aug 2004 17:09:42 -0500
Hector, I suggest you look into 'delrin cable clamps'. These are usually high temperature tolerable, come in different colors [perhaps different UV resistance?], different sizes [to fit around differ
/archives//html/Towertalk/2004-08/msg00450.html (9,940 bytes)

190. Re: [TowerTalk] tower base insulators (score: 1)
Date: Thu, 26 Aug 2004 23:07:10 -0400 (EDT)
Tom I have had much success using solid fiberglass rods .. just inserting them in the tower legs and base, bolting securely. Don N8DE _______________________________________________ See: http://www.m
/archives//html/Towertalk/2004-08/msg00602.html (8,623 bytes)

191. Re: [TowerTalk] GPS receivers (score: 1)
Author: Don Havlicek <>
Date: Thu, 16 Sep 2004 23:05:19 -0500
I'm almost afraid to say it .. .but .... it might help find TRUE NORTH! Don N8DE-- ducking to avoid the FLAMES. Jim Brown wrote: On Thu, 16 Sep 2004 22:50:40 -0400, Steve wrote: HFTA Aw cummon -- cut
/archives//html/Towertalk/2004-09/msg00332.html (9,181 bytes)

192. Re: [Towertalk] Rotating a 40-meter dipole (score: 1)
Author: Don Havlicek <>
Date: Wed, 29 Sep 2004 09:06:50 -0500
90 degrees will NOT get you 360 degrees of coverage. You will need 135 degrees to accomplish that. You can side-mount a rotor to one tower leg and place the dipole on top of the rotor. 120 degrees of
/archives//html/Towertalk/2004-09/msg00677.html (8,606 bytes)

193. Re: [TowerTalk] hairpin (score: 1)
Author: Don Havlicek <>
Date: Wed, 29 Sep 2004 21:14:02 -0500
I'll measure the loop on mine tomorrow .. and post it here. Don N8DE wrote: In a message dated 9/29/2004 4:34:20 PM Eastern Daylight Time, writes: Cou
/archives//html/Towertalk/2004-09/msg00699.html (9,258 bytes)

194. Re: [TowerTalk] hairpin (score: 1)
Author: Don Havlicek <>
Date: Thu, 30 Sep 2004 09:32:19 -0500
Just measured mine. The 'loop' is 25.5 inches either side of the boom attachment point, thus is 51 inches overall. The shape is almost a continuous curve from driven element attachment point to boom
/archives//html/Towertalk/2004-09/msg00715.html (9,243 bytes)

195. Re: [TowerTalk] Three Questions for HDX-555 Tower Project (score: 1)
Author: Don Havlicek <>
Date: Thu, 30 Sep 2004 09:52:07 -0500
Comments inserted below: Pat Chiles wrote: Hey guys could I tap you vast knowledge to to get some comments on the following. 1. How hard is it to drill chromolly? One attempt here was a failure ... d
/archives//html/Towertalk/2004-09/msg00718.html (8,999 bytes)

196. [TowerTalk] Re: Telrex TB5EM hairpin (score: 1)
Author: Don Havlicek <>
Date: Thu, 30 Sep 2004 10:37:37 -0500
"It worked great, 1:1 SWR...." Where was this fantastic SWR measured? .. at the antenna? .. or at the far end of the feedline? I'll bet that it's the latter case. The balun and hairpin are designed t
/archives//html/Towertalk/2004-09/msg00721.html (12,594 bytes)

197. Re: [TowerTalk] Caps for 3" boom (score: 1)
Author: Don Havlicek <>
Date: Tue, 05 Oct 2004 11:57:19 -0500
Look below: David Thompson wrote: Thanks to a tip from Bill, K4XS I got a 3" cap with hose clamp from Home Depot. The cap cost $3.97. They stock caps for 2", 2.5", 3" and 4" pipe but remember this is
/archives//html/Towertalk/2004-10/msg00081.html (8,965 bytes)

198. Re: [TowerTalk] Caps for 3" boom (score: 1)
Author: Don Havlicek <>
Date: Tue, 05 Oct 2004 13:00:36 -0500
Pat Chiles wrote: Which way is True North? 5 times thicker mean 5 times the thickness of the object being compared. No .. five times thicker means SIX times as thick. ... what would ONE time thicker
/archives//html/Towertalk/2004-10/msg00089.html (8,858 bytes)

199. RE: [TowerTalk] Wilson DB54 and its problems (score: 1)
Date: Mon, 11 Oct 2004 11:50:44 -0400 (EDT)
I've been mulling over a possible{?} solution to interaction between 2-band yagis on one boom. The idea is this: Put the elements perpendicular to each other, but rotate the boom so elements are 45-d
/archives//html/Towertalk/2004-10/msg00218.html (10,673 bytes)

200. Re: [TowerTalk] coax 'sweet lenght' (score: 1)
Author: Don Havlicek <>
Date: Wed, 13 Oct 2004 09:25:34 -0500 wrote: At 03:12 13.10.2004, you wrote: On the other hand, if the load is not matched to the transmission line, which happens in the real world a lot, a transmission line that is
/archives//html/Towertalk/2004-10/msg00292.html (11,998 bytes)

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