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Total 152 documents matching your query.

141. Re: [TowerTalk] matching a delta loop (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Thu, 19 Oct 2006 16:19:52 -0400
Sorry... with the apex UP...the feedpoint impedance varies with the height of the lower leg above ground. The ones I had were no more than 10' or 15' above gnd, to produce a decent match. I'd have to
/archives//html/Towertalk/2006-10/msg00538.html (8,495 bytes)

142. [TowerTalk] tower in the woods (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Thu, 26 Oct 2006 04:35:01 -0400
trees them, and K6VVA replied: Umh, remember that "stuff" happens. Several months ago I had two 45ft "old growth" pine trees come crashing down several weeks apart. <snip> You might want to rethink y
/archives//html/Towertalk/2006-10/msg00705.html (8,576 bytes)

143. Re: [TowerTalk] fullwave loop through trees (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Sun, 29 Oct 2006 15:00:20 -0500
ORIGINAL MESSAGE: expected results? -- REPLY FOLLOWS -- By "without insulators" if you mean the loop wire is touching the tree itself, you are asking for trouble. Trees have been set on fire by arcin
/archives//html/Towertalk/2006-10/msg00779.html (8,312 bytes)

144. [TowerTalk] length of inverted Ell (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Wed, 01 Nov 2006 16:31:33 -0500
Juan, In the post immediately before yours, Eddie, VE3CUI, indicated his Ell is 170' long. But you can just as easily make it one quarter wave...about 134', or 40m. The longer you make it, the greate
/archives//html/Towertalk/2006-11/msg00009.html (7,021 bytes)

145. [TowerTalk] altitude (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Fri, 10 Nov 2006 12:21:35 -0500
Jim, I've never seen any quantitative site studies supporting altitude as a dominant variable, unto itself. The answer probably depends more on other variables than just altitude. Like...does the ter
/archives//html/Towertalk/2006-11/msg00216.html (7,812 bytes)

146. Re: [TowerTalk] vertical vs horizontal--a different take (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Sun, 12 Nov 2006 07:26:50 -0500
K8RI's post on this topic finally prompted me to raise a question that's been bothering me for some time. Why is powerline noise vertically polarized? Power lines are horizontal. Yes, it's true that
/archives//html/Towertalk/2006-11/msg00251.html (7,700 bytes)

147. Re: [TowerTalk] vertical vs horizontal--a different take (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Sun, 12 Nov 2006 11:19:10 -0500
I understand the notion of the physical response patterns of verticals and horizontals. And, I would agree with Jim lux's observation about groundwave absorption.... except for the question of how ra
/archives//html/Towertalk/2006-11/msg00258.html (10,708 bytes)

148. [TowerTalk] Query RFI (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Sat, 18 Nov 2006 19:21:55 -0500
Search the RFI thread at contesting.com.... There was a post a year or two back, regarding dimmers, and a brand which was properly bypassed, and quiet. No longer remember the answer...just the place
/archives//html/Towertalk/2006-11/msg00395.html (7,387 bytes)

149. [TowerTalk] BIG array (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Wed, 22 Nov 2006 11:34:52 -0500
Big toys for big boys. But the reasoning behind 3 over 4 over 4 escapes me. As does the expense and complexity of the H frame. Perhaps it was driven by pure gain, and the desire to hear moonbounced H
/archives//html/Towertalk/2006-11/msg00543.html (8,045 bytes)

150. Re: [TowerTalk] Big Array (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Wed, 22 Nov 2006 15:46:04 -0500
4/4/4 on each side makes more sense. Someone said 3/4/4, and since there were no picture links on the URL provided, I wasn't able to see the error. Didn't take time to do a lot of exploration on the
/archives//html/Towertalk/2006-11/msg00562.html (7,839 bytes)

151. [TowerTalk] HF Vertical....data.... (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Sun, 26 Nov 2006 21:33:13 -0500
TT: I snipped the exchange, below...but have had an R8 as a utility antenna, and a full size 40M GP located 10 wavelengths away, at approximately the same height. The answer...on 40m, at least...is t
/archives//html/Towertalk/2006-11/msg00726.html (7,726 bytes)

152. [TowerTalk] free towers? (score: 1)
Author: "Jim Jarvis" <jimjarvis@verizon.net>
Date: Wed, 29 Nov 2006 12:29:19 -0500
While Bill is absolutely correct, I'd like to add a note of caution. There ARE no free towers. You may incur significant liability in removing a structure from someone else's property. Taking down o
/archives//html/Towertalk/2006-11/msg00855.html (8,329 bytes)

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