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References: [ +from:k2av@contesting.com: 323 ]

Total 323 documents matching your query.

301. Re: [TowerTalk] UV and WX deterioration of THHN insulation, and effects (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Wed, 28 Dec 2016 16:17:26 -0500
Bare wire up outdoors over ten years, just what I would term a patina on the outside. This is in contrast to what happens to bare copper used in a woven coax shield which has become waterlogged, wher
/archives//html/Towertalk/2016-12/msg00353.html (10,090 bytes)

302. Re: [TowerTalk] Fwd: UV and WX deterioration of THHN insulation, and effects (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Fri, 30 Dec 2016 16:30:30 -0500
UV and weather degraded THHN wire was replaced with new bare wire and 60 ohms resistance disappeared that was visible only at RF. The wires were all pulled between posts, and the old wire was NOT sag
/archives//html/Towertalk/2016-12/msg00372.html (12,070 bytes)

303. Re: [TowerTalk] Copper Vs AL Was UV and WX deterioration of THHN insulation, and effects (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Fri, 30 Dec 2016 16:38:55 -0500
The question is not whether the laws of physics change, they don't. Always the question is whether or not WE understand what the laws of physics ACTUALLY are. Once upon a time you could get yourself
/archives//html/Towertalk/2016-12/msg00373.html (10,587 bytes)

304. Re: [TowerTalk] Datasheet for Rohn TA-55 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sat, 7 Jan 2017 11:10:24 -0500
Believe this was during hurricane Isabel in 2003. The prevailing yak afterwards was that if he had cut the lines at the bottom and unpinned the rotator, let the tower and yagis "windvane", that he wo
/archives//html/Towertalk/2017-01/msg00157.html (8,425 bytes)

305. Re: [TowerTalk] torque arms or not? (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sat, 7 Jan 2017 19:19:53 -0500
The tower was 200' or in that neighborhood, and had a pair of phased 4 element 40m yagis, OWA's I think. It was big and a lot of wind load. 73, Guy K2AV ______________________________________________
/archives//html/Towertalk/2017-01/msg00169.html (8,636 bytes)

306. Re: [TowerTalk] torque arms or not? (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sat, 7 Jan 2017 20:03:15 -0500
Did a little more digging into hurricane Isabel. Gusts were measured in the Norfolk area up to 74 mph, which compared to other hurricanes may seem tame. At landfall, Isabel was a category 2, but was
/archives//html/Towertalk/2017-01/msg00170.html (11,512 bytes)

307. Re: [TowerTalk] Ground radials for phased arrays (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Fri, 13 Jan 2017 15:25:44 -0500
Phased antennas with buried radials need to be done with bare wire. That allows the ground conductivity to participate in and improve the conduction. The soldered wire crossings "bus bar" removes int
/archives//html/Towertalk/2017-01/msg00219.html (10,537 bytes)

308. Re: [TowerTalk] Force 12 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Thu, 19 Jan 2017 12:43:53 -0500
Digging through various postings, it seems that the current F12, was also acting as a front for Inovative designs in the US. The latter now has something going with MFJ, which means all the web stuff
/archives//html/Towertalk/2017-01/msg00298.html (9,683 bytes)

309. Re: [TowerTalk] Force 12 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Thu, 19 Jan 2017 13:44:44 -0500
Digging through various postings, it seems that the current F12, was also acting as a front for Inovative designs in the US. The latter now has something going with MFJ, which means all the web stuff
/archives//html/Towertalk/2017-01/msg00301.html (10,119 bytes)

310. Re: [TowerTalk] Strange behavior (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Mon, 23 Jan 2017 17:03:05 -0500
The best way, if you have visible items in satellite maps on Google Earth, is to use the built-in distance and bearing facility. map length to "feet" click the cross-hair over spot 1, then click cros
/archives//html/Towertalk/2017-01/msg00381.html (9,310 bytes)

311. Re: [TowerTalk] FT240-43 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sun, 29 Jan 2017 09:17:34 -0500
Why are you not looking for FT240-31 cores? What uses are you making of them? Go read K9YC's web page. 73, Guy K2AV _______________________________________________ ___________________________________
/archives//html/Towertalk/2017-01/msg00490.html (8,046 bytes)

312. Re: [TowerTalk] Elements of a yagi (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sat, 4 Feb 2017 14:20:17 -0500
Hi Bill, Phasing center cannot be assumed with dissimilar yagis. What is usually done, is to monkey with phasing lines until a null at low angles is obtained. Then remove 180 degrees. The difficulty
/archives//html/Towertalk/2017-02/msg00086.html (9,804 bytes)

313. Re: [TowerTalk] Attractive nuisance (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Tue, 7 Feb 2017 14:27:05 -0500
The best that I have seen is flat sheets of galvanized steel cut to fit across the rungs between the vertical metal and permanently attached up to a point requiring a ladder to get to a climbing poin
/archives//html/Towertalk/2017-02/msg00196.html (10,412 bytes)

314. Re: [TowerTalk] LPDA optimal height (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Tue, 14 Feb 2017 11:56:20 -0500
It's not the tools that are band-specific. The reflection formed vertical pattern is band specific. You are defeated in this by the laws of physics. Some partially solve this dilemma with stacks. Sta
/archives//html/Towertalk/2017-02/msg00311.html (9,860 bytes)

315. Re: [TowerTalk] What am I missing....balun (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Fri, 17 Feb 2017 14:58:13 -0500
See https://www.coleparmer.com/tech-article/uv-properties-of-plastics 73, Guy K2AV _______________________________________________ _______________________________________________ TowerTalk mailing li
/archives//html/Towertalk/2017-02/msg00369.html (9,829 bytes)

316. Re: [TowerTalk] W2AU Baluns?? (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Fri, 17 Mar 2017 14:53:59 -0400
Indeed. Over a decade ago, following some RadioWorks failures at W0UCE(SK), taking failed units apart, there actually was a very simple way of rebuilding burned/melted coax wound on ferrite rod devic
/archives//html/Towertalk/2017-03/msg00206.html (10,775 bytes)

317. Re: [TowerTalk] current balun question (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Mon, 20 Mar 2017 06:51:31 -0400
Indeed. But this is THE monkey wrench in the works for a lot of folks, possibly including the original poster on this thread. On the lower bands, a lot of "all band" chokes have very little blocking.
/archives//html/Towertalk/2017-03/msg00267.html (10,770 bytes)

318. Re: [TowerTalk] 80 meter beam (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Sun, 02 Apr 2017 05:30:21 +0000
On 160 and to a lesser extent 80 RX antennas prove out better than TX antennas for listening. Set your TX antenna for some compromise of gain, bandwidth and azimuth coverage. As most RX solutions wor
/archives//html/Towertalk/2017-04/msg00015.html (10,942 bytes)

319. Re: [TowerTalk] MFJ-854 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Wed, 12 Apr 2017 09:17:45 -0400
I have a much smaller non-powered version of this instrument, the MFJ-853, that cost about half the price of the 854. The 853 works 300 ma, 1 amp and 3 amps. It has been quite adequate for seeing in
/archives//html/Towertalk/2017-04/msg00098.html (13,078 bytes)

320. Re: [TowerTalk] TowerTalk Digest, Vol 172, Issue 38 (score: 1)
Author: Guy Olinger <k2av@contesting.com>
Date: Thu, 27 Apr 2017 13:47:12 -0400
Having disassembled a couple of the Carolina Windom devices that W0UCE burned up running 1500W CW to them, I can attest to their weakness. The windings were RG8X wound on what appeared to be adequate
/archives//html/Towertalk/2017-04/msg00162.html (8,718 bytes)


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