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Total 21 documents matching your query.

1. [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 19:48:10 -0400; However, there are unless the shielding duplex repeater close to a high I went through a few exercises in Toledo in the early 70's. We had a 200W PA on a Micor, and I was new to repeaters. My friend; /archives//html/Towertalk/2004-10/msg00260.html (10,351 bytes)
2. [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 20:01:49 -0400; Re: Double shielding, usually it's not important at all. However, there are unless the shielding duplex repeater close to a high OK, now I'm on the same page (except for the repeaters, because most d; /archives//html/Towertalk/2004-10/msg00262.html (8,664 bytes)
3. RE: [TowerTalk] Shields (score: 1): Author: "Daron J. Wilson" <daron@wilson.org>; Date: Tue, 12 Oct 2004 17:07:17 -0700; I guess my only theory would be that I generally use the feedline to transfer energy from the transmitter TO the radiating system, and prefer that the feedline not be part of the radiating system. I; /archives//html/Towertalk/2004-10/msg00263.html (8,205 bytes)
4. [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 21:00:07 -0400; Hey, just put the heat shields up. There seem to be enough to go around. to be double shield provides a coax such as dielectric, my hunch so one over the the I think the problem comes from the fact; /archives//html/Towertalk/2004-10/msg00264.html (11,765 bytes)
5. RE: [TowerTalk] Shields (score: 1): Author: "Daron J. Wilson" <daron@wilson.org>; Date: Tue, 12 Oct 2004 18:18:54 -0700; same >(within instrument error) when I use RG-8/U or small solid-shield heliax. Tom I'm not questioning your experience or testing, but what are the manufacturers of duplexers missing? They seem to; /archives//html/Towertalk/2004-10/msg00266.html (8,999 bytes)
6. Re: [TowerTalk] Shields (score: 1): Author: John Kiesel <yamaha_xs_johnny@yahoo.com>; Date: Tue, 12 Oct 2004 18:40:43 -0700 (PDT); Just an an anectode about Coax problems. Years ago when I had a big HF System, which included large monobanders and 80 meter vees and quads. I was trying to work OH2BH on the short path on 75. It had; /archives//html/Towertalk/2004-10/msg00267.html (15,107 bytes)
7. Re: [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 21:55:05 -0400; what are the that double would think it if components. I don't know that they think anything. Many times I've decided to do something that isn't necessary simply because people (through popular opin; /archives//html/Towertalk/2004-10/msg00268.html (9,468 bytes)
8. Re: [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 22:08:04 -0400; What's so special about a shield? If currents are equal and opposite and conductors are very close, you don't need a shield at all to prevent radiation at any distance. I can have a 100ft long piece; /archives//html/Towertalk/2004-10/msg00269.html (9,562 bytes)
9. RE: [TowerTalk] Shields (score: 1): Author: "Daron J. Wilson" <daron@wilson.org>; Date: Tue, 12 Oct 2004 19:25:11 -0700; I'm sure you know the difference between balanced and unbalanced feedlines. But..if the shield is no matter, how about taking that RG8X and stripping all that unneeded copper braid off completely? I; /archives//html/Towertalk/2004-10/msg00270.html (9,936 bytes)
10. Re: [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 12 Oct 2004 22:56:56 -0400; unbalanced RG8X and I'm guessing with a braid on The point is if currents are equal and opposite and conductors are close, a line certainly doesn't radiate very much. The vast majority of problems a; /archives//html/Towertalk/2004-10/msg00272.html (9,704 bytes)
11. Re: [TowerTalk] Shields (score: 1): Author: "Jim Lux" <jimlux@earthlink.net>; Date: Tue, 12 Oct 2004 21:15:15 -0700; I'll bite, as well.. Double shielding might provide a more consistent cable propagation characteristic as the cable flexes. Double shielding might help (if properly (however that might be) to separat; /archives//html/Towertalk/2004-10/msg00275.html (11,290 bytes)
12. Re: [TowerTalk] Shields (score: 1): Author: "Jim Lux" <jimlux@earthlink.net>; Date: Tue, 12 Oct 2004 21:18:25 -0700; Except that the shield is woven, so the conductors "penetrate the shielding plane", and can carry energy from inside to outside. All bets are off on small apertures with woven shielding. All the fol; /archives//html/Towertalk/2004-10/msg00276.html (9,589 bytes)
13. Re: [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 13 Oct 2004 06:41:22 -0400; "penetrate the shielding bets are off on Actually it's pretty good when the shield wires are compressed by the jacket and clean. That's why moisture or anything else that increases resistance of tho; /archives//html/Towertalk/2004-10/msg00284.html (10,114 bytes)
14. [TowerTalk] Shields (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Wed, 13 Oct 2004 13:02:28 +0100 (BST); Sorry, but I just have to stick my oar in here! Even cable with a perfectly conducting 100% outer shield will radiate to some extent. This is because the diameter of the INSIDE of the shield is less; /archives//html/Towertalk/2004-10/msg00286.html (9,024 bytes)
15. RE: [TowerTalk] Shields (score: 1): Author: Steve Katz <stevek@jmr.com>; Date: Wed, 13 Oct 2004 07:47:48 -0700; Actually, in my experience using hardline or 100% (or at least very good double) shielded cables in VHF-UHF repeater systems and cavity interconnects in duplexers does make a difference, not necessar; /archives//html/Towertalk/2004-10/msg00297.html (11,638 bytes)
16. RE: [TowerTalk] Shields (score: 1): Author: "Keith Dutson" <kjdutson@earthlink.net>; Date: Wed, 13 Oct 2004 10:47:55 -0500; Perhaps we are not concerned about shielding at all but just want the lowest loss cable available, and it is shielded this way. Keith NM5G unbalanced RG8X and I'm guessing with a braid on The point i; /archives//html/Towertalk/2004-10/msg00298.html (11,191 bytes)
17. Re: [TowerTalk] Shields (score: 1): Author: VR2BrettGraham <vr2bg@harts.org.hk>; Date: Wed, 13 Oct 2004 23:33:51 +0000; WB2WIK/6 added: Actually, in my experience using hardline or 100% (or at least very good double) shielded cables in VHF-UHF repeater systems and cavity interconnects in duplexers does make a differen; /archives//html/Towertalk/2004-10/msg00323.html (8,943 bytes)
18. Re: [TowerTalk] Shields (score: 1): Author: "Tower (K8RI)" <tower@rogerhalstead.com>; Date: Wed, 13 Oct 2004 20:01:32 -0400; VR2BrettGraham wrote: <snip> With all the energy floating around hilltops, any diode action anywhere is bound to bring grief. Certainly sounds like the mechanism here & going to better shielded cable; /archives//html/Towertalk/2004-10/msg00324.html (9,498 bytes)
19. Re: [TowerTalk] Shields (score: 1): Author: "Tower (K8RI)" <tower@rogerhalstead.com>; Date: Wed, 13 Oct 2004 20:03:09 -0400; VR2BrettGraham wrote: <snip> With all the energy floating around hilltops, any diode action anywhere is bound to bring grief. Certainly sounds like the mechanism here & going to better shielded cable; /archives//html/Towertalk/2004-10/msg00325.html (9,605 bytes)
20. Re: [TowerTalk] Shields (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 13 Oct 2004 20:49:18 -0400; with the base any of the guy mobile 3 to 5 the steel guy line. That's why you never mount antenna near metallic guylines, and make sure the antenna you use is properly designed to prevent exciting t; /archives//html/Towertalk/2004-10/msg00326.html (9,366 bytes)

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