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1. [Towertalk] LPDAs... (score: 1): Author: k6rix@arrl.net (Dino Darling); Date: Wed, 13 Nov 2002 22:17:12 -0800; I appreciate Jon's comments below. As he pointed out, my interest in LPDA's is due to my MARS work. Jon, if you get a chance, read September 2002 QST, pp31! (also found here...http://www.realhamradio; /archives//html/Towertalk/2002-11/msg00292.html (9,372 bytes)
2. [Towertalk] LPDAs... (score: 1): Author: na9d@speakeasy.net (Jon Ogden); Date: Thu, 14 Nov 2002 08:40:46 -0600; I could believe they have better F/B than a small Yagi. I also believe that a good sized LPDA would outperform a small beam. However, I am not completely sold on the idea of absolutely better perform; /archives//html/Towertalk/2002-11/msg00296.html (8,273 bytes)
3. [Towertalk] LPDAs... (score: 1): Author: Jim@ShawResources.com (Jim Shaw); Date: Thu, 14 Nov 2002 08:51:38 -0800; QUESTION: Instead of an LPDA, why not use a 3 element SteppIR antenna? Don't they cover all frequencies continuously from 13.9 to 30 MHz? Isn't that similar to the design goal of an LPDA? Seems like; /archives//html/Towertalk/2002-11/msg00298.html (9,729 bytes)
4. [Towertalk] LPDAs... (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 14 Nov 2002 09:48:22 -0800; The SteppIR is catching on and seems to have a loyal following, so it's a success. However, here are the LPDA advantages that I find, as a user: -No moving parts to wear out or fail -Maintains excell; /archives//html/Towertalk/2002-11/msg00300.html (12,824 bytes)
5. [Towertalk] LPDAs... (score: 1): Author: na9d@speakeasy.net (Jon Ogden); Date: Thu, 14 Nov 2002 12:34:28 -0600; The SteppIR antenna has been discussed here ad nauseum. My main issues with the SteppIR: 1.) Mechanical. How reliable is it? What about condensation inside the motor, etc. and then what about when al; /archives//html/Towertalk/2002-11/msg00306.html (9,138 bytes)
6. [Towertalk] LPDAs... (score: 1): Author: spelunk.sueno@prodigy.net (EUGENE SMAR); Date: Thu, 14 Nov 2002 14:16:29 -0500; TT: It seems to me that the main advantage of the SteppIR concept is that the operator gets a warm-and-fuzzy feeling about SWR everywhere he decides to operate. Other than that, it seems like it's a; /archives//html/Towertalk/2002-11/msg00308.html (11,342 bytes)
7. [Towertalk] LPDAs... (score: 1): Author: on4kj@skynet.be (on4kj); Date: Thu, 14 Nov 2002 22:38:55 -0000; The SteppIR can obviously be adjusted to make a beam pattern over an octave or more, and to create a good match to its feedline, by infinitely varying all the element length combinations; but it will; /archives//html/Towertalk/2002-11/msg00312.html (13,481 bytes)
8. [Towertalk] LPDAs... (score: 1): Author: k3bz@arrl.net (Jerry Keller); Date: Thu, 14 Nov 2002 18:29:27 -0500; At least until SteppIR II, with variable boom length and element spacing. Watch for it. Jerry K3BZ --Original Message-- From: towertalk-admin@contesting.com [mailto:towertalk-admin@contesting.com]On; /archives//html/Towertalk/2002-11/msg00314.html (14,371 bytes)
9. [Towertalk] LPDAs... (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Thu, 14 Nov 2002 15:21:32 -0800; Hi Jos, I'm all for it, and recommended this already. I don't have the bandwidth for such a project myself, nor am I a mechanical engineer; however I'm certain such expertise exists, possibly right h; /archives//html/Towertalk/2002-11/msg00315.html (15,090 bytes)
10. [Towertalk] LPDAs... (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Fri, 15 Nov 2002 00:04:04 +0000; Now that's a really Interesting thought... If they have the technology to vary the element lengths they should be able to scale it to vary the boom length for each band for optimum element spacing. 7; /archives//html/Towertalk/2002-11/msg00316.html (8,393 bytes)
11. [Towertalk] LPDAs... (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Thu, 14 Nov 2002 19:11:18 -0500; able And if the mechanics are as robust as the manufacturer claims, variable spacing + variable boom length would make this the last word in Yagi antennas....especially if they ever sold a four-elem; /archives//html/Towertalk/2002-11/msg00317.html (8,285 bytes)
12. [Towertalk] LPDAs... (score: 1): Author: w4zw@comcast.net (W4ZW); Date: Thu, 14 Nov 2002 20:12:07 -0500; I have a 3 element SteppIr on order. All this ocean in my front yard eats yagis, and having a fiberglass tube with the electrical element inside should be better than exposed aluminum and SS hardware; /archives//html/Towertalk/2002-11/msg00318.html (8,506 bytes)
13. [Towertalk] LPDAs... (score: 1): Author: n4kg@juno.com (n4kg@juno.com); Date: Thu, 14 Nov 2002 21:00:33 -0600; SO WHAT? IF you optimize an antenna for F/B it will NOT be optimized for gain. IF you optimize an antenna for GAIN, it will NOT be optimized for F/B. IF you optimize for SWR (assuming split dipole fe; /archives//html/Towertalk/2002-11/msg00320.html (8,716 bytes)
14. [Towertalk] LPDAs... (score: 1): Author: K7LXC@aol.com (K7LXC@aol.com); Date: Thu, 14 Nov 2002 23:27:32 EST; The StepIR: But cheap for five (or more) monobanders. Cheers, Steve K7LXC TOWER TECH; /archives//html/Towertalk/2002-11/msg00327.html (7,442 bytes)
15. [Towertalk] LPDAs... (score: 1): Author: j.a.hermans@skynet.be (j.a.hermans); Date: Fri, 15 Nov 2002 10:44:06 -0000; Steve, What about putting the whole " Variable Geometrie " in a protected environment, such as a light air pressure. The envelop could be some kind of reenforced Mylar already used fot baloons.......; /archives//html/Towertalk/2002-11/msg00414.html (17,352 bytes)
16. [Towertalk] LPDAs... (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Mon, 18 Nov 2002 07:46:22 -0800; [Steve Katz] Jos, when cost is no object, all sorts of things are possible! I worked on the AWACS program in the late 1970's and that was a "cost plus" contract from USAF. The more it cost to build,; /archives//html/Towertalk/2002-11/msg00425.html (19,372 bytes)

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