- 261. Re: [TowerTalk] verticals above beams (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 23 Oct 2009 10:36:32 -0400
- This discussion has drifted somewhat, from the original question, which was, "how to I treat the radials?". And the answer to that is, you don't. Can't do it without tangling in the beam. Can't effec
- /archives//html/Towertalk/2009-10/msg00400.html (8,909 bytes)
- 262. Re: [TowerTalk] Log Periodic Antennas and Front End Overload (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Mon, 26 Oct 2009 08:36:48 -0400
- Mat, I had a Tennadyne T8 @ 80', in VT. Used it with a 756, 756pro, and 756proII. Although I never HEARD any intermod, in the bandscope, on 15m, I saw an elevated baseline, which was determined to be
- /archives//html/Towertalk/2009-10/msg00436.html (7,065 bytes)
- 263. [TowerTalk] off topic post (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Wed, 28 Oct 2009 08:51:48 -0400
- If anyone on here has knowledge of early makers of spark keys or early landline keys, please contact me directly, off-reflector. I'm attempting to identify the origins of my first key... now determin
- /archives//html/Towertalk/2009-10/msg00449.html (6,985 bytes)
- 264. Re: [TowerTalk] vertical dipoles (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Wed, 18 Nov 2009 02:20:16 -0500
- k9ay observed that vertical dipoles weren't very good antennas... When challenged by EI7BA, he observed that his 40m inverted vee @ 120' outperformed a vertical dipole with its top at the same height
- /archives//html/Towertalk/2009-11/msg00311.html (8,685 bytes)
- 265. [TowerTalk] 40 m vertical radials (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 04 Dec 2009 15:07:52 -0500
- time proven formula: Make the radials 5% longer than the main radiator. Once up, fold back the radial ends to bring the antenna into resonance. You don't have to cut them off... just fold them back a
- /archives//html/Towertalk/2009-12/msg00033.html (6,888 bytes)
- 266. Re: [TowerTalk] log periodic beam performance (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Sun, 13 Dec 2009 22:17:33 -0500
- I'd appreciate hearing of experience with LP beams, especially performance vs number of elements. The little T6 spec's are remarkably similar to the T10, but some experienced people are pretty adaman
- /archives//html/Towertalk/2009-12/msg00134.html (10,884 bytes)
- 267. Re: [TowerTalk] log periodic antennas (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Tue, 15 Dec 2009 15:13:41 -0500
- As one who has a T10 log periodic and has wrung the last amount of performance out of this design I can truthfully say I have never had an out of band interference problem with it. With a good receiv
- /archives//html/Towertalk/2009-12/msg00144.html (7,956 bytes)
- 268. [TowerTalk] ab577/621 (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Thu, 17 Dec 2009 16:41:02 -0500
- Hi Folks, Has anyone ever used a small motor to crank the mast up on an AB-577 or 621? If so, are there any recommendations for a particular motor type or mfgr? Seems like it would be easy to couple
- /archives//html/Towertalk/2009-12/msg00162.html (7,566 bytes)
- 269. Re: [TowerTalk] aluminum tubing (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Sat, 19 Dec 2009 07:49:20 -0500
- Joe, (all), Bethlehem Aluminum (yes, an offshoot of Beth. Steel) will sell you aluminum, in whatever form and tempering, essentially by the pound. They have service centers along the east coast, and
- /archives//html/Towertalk/2009-12/msg00202.html (8,497 bytes)
- 270. Re: [TowerTalk] rohn 25 as vertical (score: 1)
- Author: Jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 25 Dec 2009 21:06:42 -0500
- I'm surprised that nobody advocated shunt feeding the tower. Forget about insulating it (and then having to deal with static drain/lightning ground)... just tie the thing to the ground radial system,
- /archives//html/Towertalk/2009-12/msg00286.html (7,051 bytes)
- 271. [TowerTalk] 160m antenna (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Sat, 02 Jan 2010 11:35:59 -0500
- Since I'm coming in late on this, I'll keep it brief. a) "many old AM Broadcast Towers" did NOT use "slant feed". in fact, the FCC almost universally required series fed systems, and where they didn'
- /archives//html/Towertalk/2010-01/msg00043.html (8,867 bytes)
- 272. Re: [TowerTalk] neverseize on tower legs (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Wed, 06 Jan 2010 22:14:27 -0500
- Tony, Get yourself a "TowerJack". You'll need to overcome gravity, plus whatever alignment distortion generated friction there was when you assembled, plus corrosion. Towerjack works. Car jack and 2x
- /archives//html/Towertalk/2010-01/msg00131.html (7,308 bytes)
- 273. [TowerTalk] tower jack (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Thu, 07 Jan 2010 06:18:49 -0500
- If Tower Jack is no longer available commercially, the thing to do is to either borrow one, or get someone who has one to make you a sketch... and get one made up at a local shop. Probably wouldn't c
- /archives//html/Towertalk/2010-01/msg00141.html (6,953 bytes)
- 274. Re: [TowerTalk] rohn 25g tiltover ideas (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 08 Jan 2010 06:16:00 -0500
- W3GM ROUTINELY tilted over all of his 100' 25g towers, using the falling derrick method. The towers are guyed 4-way, instead of three, and the back guys go to 40' of 25g which serve as a ginpole. The
- /archives//html/Towertalk/2010-01/msg00156.html (7,352 bytes)
- 275. Re: [TowerTalk] TowerTalk Digest, Vol 85, Issue 62 (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Tue, 19 Jan 2010 15:21:31 -0500
- Yeah, but Dave's ground is New England bedrock! It's not going anywhere. I had 45g up 60' in Vermont, with only two house brackets, and no foundation, too. 2' into the ground, we hit a big-ass rock t
- /archives//html/Towertalk/2010-01/msg00417.html (7,667 bytes)
- 276. [TowerTalk] Hustler 5BTV Problem (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Wed, 20 Jan 2010 21:59:53 -0500
- Won't tune on 40? High vswr on 20? I suspect a bad 20m trap. 10 and 15 are ok. 20 is wierd.. trap in backwards? Might be enough to keep 40m from tuning... and isn't the 80m tuning really a top loadin
- /archives//html/Towertalk/2010-01/msg00458.html (8,528 bytes)
- 277. Re: [TowerTalk] LP vs SteppIR (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 22 Jan 2010 16:19:43 -0500
- I made comments directly to Doug, at his first posting, and said that this thread would again get legs. :) So let me repeat some of my comment, for those who didn't see it the last time. 1) I've had
- /archives//html/Towertalk/2010-01/msg00512.html (9,517 bytes)
- 278. Re: [TowerTalk] steppIR rubber boots (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 22 Jan 2010 17:12:16 -0500
- I think they're still using Fernco rubber plumbing boots, which really aren't designed for UV exposure. But they're relatively inexpensive. I'd suggest you try getting extra tape from steppIR, and wr
- /archives//html/Towertalk/2010-01/msg00519.html (7,910 bytes)
- 279. Re: [TowerTalk] stacked LPDA's (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Fri, 22 Jan 2010 17:25:10 -0500
- Gene, The early logs were a Collins Radio design, and used a split boom/tilt system, but it wasn't really stacked. The alternate dipole elements apparently were on the upper and lower booms. I don't
- /archives//html/Towertalk/2010-01/msg00522.html (7,746 bytes)
- 280. Re: [TowerTalk] LPDA phasing, stacking, timing (score: 1)
- Author: jim Jarvis <jimjarvis@optonline.net>
- Date: Sat, 23 Jan 2010 08:08:32 -0500
- Whilst Jim Lux and Jim Brown joust over whether it's phasing, polarity, or time delay, I would assert that a time delay which is equal to a 180 degree phase transition at the frequency in question IS
- /archives//html/Towertalk/2010-01/msg00560.html (10,078 bytes)
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