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1. [TowerTalk] Re: HyGain 7-2 (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Tue, 07 Oct 1997 13:37:56 -0400 (EDT); In my experience, this is a good antenna, with no arcing as in the older 402BA. The only weak spot I found was in the reflector element clamp, which is the smaller #13 size (1.25" ID; the driven elem; /archives//html/Towertalk/1997-10/msg00190.html (7,576 bytes)
2. [TowerTalk] Chrome-Moly Masts (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sat, 13 Sep 1997 16:53:51 -0400 (EDT); What's the current scoop on suppliers of chrome-moly masts? I need two galvanized 2" x 20', 0.25 wall or thicker. I notice that US Tower shows their mast isn't being produced. Please reply direct to; /archives//html/Towertalk/1997-09/msg00333.html (7,017 bytes)
3. [TowerTalk] Re: Tower Climbing Tip (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sun, 14 Sep 1997 19:19:04 -0400 (EDT); Great idea...here's another: When I wear a hard hat, it either falls off or I bash my head because I can't see out from under the brim. OE6MBG was here and looked over at our bicycle helmets, we trie; /archives//html/Towertalk/1997-09/msg00349.html (7,286 bytes)
4. [TowerTalk] Re: Kellum Grips (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Mon, 04 Aug 1997 14:14:48 -0400 (EDT); These cable hangers are the only way to go, but even the best solutions have some problems. Over time, I've noticed that the reinforced loop at the top wears through if the cable swings in the wind,; /archives//html/Towertalk/1997-08/msg00101.html (8,743 bytes)
5. [TowerTalk] Re: ICE (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Wed, 06 Aug 1997 00:37:09 -0400 (EDT); ICE was a sponsor of WRTC 96, and built us 200+ filters in a couple of weeks from a standing start. I measured each one on a network analyzer, and they all checked out to the ICE specs. I have a set; /archives//html/Towertalk/1997-08/msg00216.html (7,093 bytes)
6. [TowerTalk] 1/4 Wave Coax (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sat, 09 Aug 1997 14:39:01 -0400 (EDT); In his posting Re: 20 Phased, Frank Donovan mentions the unique feature of a quarter wave (or odd quarter wave multiple) line that the output current is determined only by the input voltage and the c; /archives//html/Towertalk/1997-08/msg00340.html (8,170 bytes)
7. [TowerTalk] Re: Equation for Zo (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sat, 16 Aug 1997 01:16:27 -0400 (EDT); See pg 8-7 through 8-23 of Phys. Des. of Yagi Antennas. Note that this is the formula for the characteristic impedance, not the input impedance, of the element. This is used to get the reactance vari; /archives//html/Towertalk/1997-08/msg00489.html (7,390 bytes)
8. [TowerTalk] Eqn corrected (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sat, 16 Aug 1997 01:27:51 -0400 (EDT); Sorry, correct formula for ln(ae) is ln(ae) = SUM OF [(Ln/h) O*ln(an)]; subtitute into Zo = 60 * [ln (2*h/ae) -1] = 60 * [ln(2h) - ln(ae) - 1] Dave, W6NL -- FAQ on WWW: http://www.contesting.com/towe; /archives//html/Towertalk/1997-08/msg00490.html (6,807 bytes)
9. [TowerTalk] Re: Eqn corrected (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Sat, 16 Aug 1997 01:41:08 -0400 (EDT); Somehow, an extra character and line feed crept into the message. ln(ae) = SUM OF [(Ln/h)*ln(an)]; subtitute into Zo = 60 * [ln (2*h/ae) -1] = 60 * [ln(2h) - ln(ae) - 1] ae is the equivalent radius o; /archives//html/Towertalk/1997-08/msg00491.html (7,016 bytes)
10. [TowerTalk] Re: Interference from Flourescent Lights (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Tue, 19 Aug 1997 13:00:37 -0400 (EDT); In addition to rf output, there's also a big difference among ballasts in their sound output. I had a workshop with 28 2-tube fixtures, and the hum was distracting. I noticed that some ballasts have; /archives//html/Towertalk/1997-08/msg00561.html (7,173 bytes)
11. [TowerTalk] Re: V-beam Gain and R+/-jX (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Fri, 18 Jul 1997 11:32:06 -0400 (EDT); I put up a vee beam for 10 and 15 meters, surveying and measuring carefully, with 10 wavelengths per leg on 10m. It had about the same performance as a TH7 on a 38 ft tower, and then only in its best; /archives//html/Towertalk/1997-07/msg00599.html (8,238 bytes)
12. [TowerTalk] Re: GI0AIJ (score: 1): Author: 0005543629@MCIMAIL.COM (David & Barbara Leeson); Date: Tue, 22 Jul 1997 03:56:51 -0400 (EDT); Ivor Greenwood is a designer and builder of race car engines, and has a complete shop, does beautiful metal work. He has the energy of five normal contesters, called often at his midnight, and I desi; /archives//html/Towertalk/1997-07/msg00677.html (7,232 bytes)
13. [TowerTalk] Duoband Models (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Tue, 03 Jun 1997 17:24:37 -0500 (EST); Those of you who are waiting for me to post my AO models for interlaced duobander ideas, please hang on another week. I took my copies of YO and AO to show my class at Stanford, and they won't let me; /archives//html/Towertalk/1997-06/msg00117.html (7,579 bytes)
14. [TowerTalk] Re: Wind Zones (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Thu, 05 Jun 1997 11:09:44 -0500 (EST); Wind zone information in, for example, EIA-222-F provides general broad averages that don't take full account of local terrain shape and roughness. Under some conditions wind forces can be as much as; /archives//html/Towertalk/1997-06/msg00209.html (8,362 bytes)
15. [TowerTalk] Bolt in Hole (45 Top) (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Sat, 03 May 1997 13:27:41 -0500 (EST); A few years ago, in a different context, the question of holes as stress risers and centers of fatigue failure was raised. Since then, I've seen a reference to the idea that a filled hole has much le; /archives//html/Towertalk/1997-05/msg00084.html (7,791 bytes)
16. [TowerTalk] Re: Nicopress (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Fri, 09 May 1997 09:40:44 -0500 (EST); For Nico fittings, look in the Yellow pages under Wire Rope. There are several different types, some that require a circular press and some that require an oval press. I strongly recommend getting a; /archives//html/Towertalk/1997-05/msg00273.html (7,435 bytes)
17. [TowerTalk] Re: Why el? (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Sun, 18 May 1997 11:47:12 -0500 (EST); If the elements are mounted above the boom, the center of gravity of the beam is above the boom and the antenna tends to rotate (example: the KLM designs). This makes the antenna difficult to hold ho; /archives//html/Towertalk/1997-05/msg00446.html (7,190 bytes)
18. [TowerTalk] Re: New + Ant Ramblings (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Mon, 19 May 1997 00:03:03 -0500 (EST); An interesting antenna to compare the new Skyhawk and the existing C3's to is the Hy-Gain 13-el log periodic on 26' boom. This is a very conservative design, and doesn't have the F/B possible with sp; /archives//html/Towertalk/1997-05/msg00460.html (9,093 bytes)
19. [TowerTalk] More New etc. (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Mon, 19 May 1997 00:05:15 -0500 (EST); An additional thought: I haven't had any luck at all with open sleeve parasitic elements, as they don't seem to have the same phase-frequency characteristics as single band elements. However, I've se; /archives//html/Towertalk/1997-05/msg00461.html (6,825 bytes)
20. [TowerTalk] Q of Traps (score: 1): Author: 0005543629@mcimail.com (David & Barbara Leeson); Date: Mon, 3 Mar 97 10:06 EST; Here's a question I'm curious about (but don't have time to think about or make measurements just now): Is the Q of a distributed coil, such as in the KLM traps, higher or lower than the Q of a shiel; /archives//html/Towertalk/1997-03/msg00033.html (7,298 bytes)

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