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1. Topband: Multiple Ground Systems (score: 1): Author: Michael Rauh <mikerauh@yahoo.com>; Date: Wed, 15 Aug 2007 13:51:21 -0700 (PDT); When laying out the radial fields for vertical antennas in an array, we are told to terminate the radials on a bus wire where the radials overlap. Why? What harm would come it this was not done? The; /archives//html/Topband/2007-08/msg00024.html (7,119 bytes)
2. Topband: Multiple Ground Systems (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Thu, 16 Aug 2007 05:03:18 -0700 (PDT); I have always disbelieved the "bond the crossing radials" old wives tail, for good electrical reasons... These crossing radials have differing RF phase and voltage on them... Bonding them together is; /archives//html/Topband/2007-08/msg00027.html (8,673 bytes)
3. Re: Topband: Multiple Ground Systems (score: 1): Author: k3bu@optonline.net; Date: Thu, 16 Aug 2007 13:25:51 +0000 (GMT); There is a difference between elevated and resonant radials that form the "other half" of the resonant antenna and ground "screen" against which the antenna or array works. Buried or laid on the gro; /archives//html/Topband/2007-08/msg00029.html (8,126 bytes)
4. Re: Topband: Multiple Ground Systems (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 16 Aug 2007 11:13:51 -0400; < Snip> What that proves more than anything is the radials in a small elevated radial system are significant nearfield radiators and not "grounds". It simply proves the fields are very concentrated; /archives//html/Topband/2007-08/msg00030.html (8,513 bytes)
5. Re: Topband: Multiple Ground Systems (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 16 Aug 2007 13:17:32 -0700; Here is something I always wondered about. Let's say you have verticals spaced 1/8 wave. A radial from one vertical headed towards the other is 1/16 wave long. When it hits the "bus" wire, it simply; /archives//html/Topband/2007-08/msg00031.html (9,998 bytes)
6. Re: Topband: Multiple Ground Systems (score: 1): Author: Michael Rauh <mikerauh@yahoo.com>; Date: Thu, 16 Aug 2007 14:32:49 -0700 (PDT); Thanks for the responses. I plan to have all the radials on the ground. I would be surprised to see smoke and flame from a radial field laying on the ground. It is true that bonding to a buss wire at; /archives//html/Topband/2007-08/msg00032.html (7,659 bytes)
7. Re: Topband: Multiple Ground Systems (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Thu, 16 Aug 2007 16:39:45 -0500; Rick, Your analysis is probably appropriate for a sparse set of elevated radials, each being a significant individual contributor to the radiated field. In such a case, separate radials for each ele; /archives//html/Topband/2007-08/msg00033.html (8,710 bytes)
8. Re: Topband: Multiple Ground Systems (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Fri, 17 Aug 2007 00:24:54 +0200; Probably the first question to be asked when considering any electrical connection is "What a current is expected to flow there and with what a purpose?". I don't know the answer in this case, but ho; /archives//html/Topband/2007-08/msg00034.html (7,105 bytes)
9. Re: Topband: Multiple Ground Systems (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 16 Aug 2007 20:59:26 -0400; Why does the current need to be in any particular direction Rick? That buss, assuming you have 50 radials or more, has a pretty low termination impedance for the small currents in the radial. While; /archives//html/Topband/2007-08/msg00038.html (9,621 bytes)
10. Re: Topband: Multiple Ground Systems (score: 1): Author: Michael Rauh <mikerauh@yahoo.com>; Date: Fri, 17 Aug 2007 07:22:24 -0700 (PDT); "I prefer to think of a radial system as an approximation of a solid sheet rather than individual conductors." "Why does the current need to be in any particular direction Rick? That buss, assuming y; /archives//html/Topband/2007-08/msg00041.html (8,753 bytes)
11. Re: Topband: Multiple Ground Systems (score: 1): Author: Michael Rauh <mikerauh@yahoo.com>; Date: Fri, 17 Aug 2007 10:47:38 -0700 (PDT); Just FYI: In the case of an 80M foursquare with 60 each 66 foot radials, the total radial wire required is 15,840 feet. Roughly 200 feet of buss wire and 11,764 feet of radial wire will be needed for; /archives//html/Topband/2007-08/msg00043.html (7,474 bytes)
12. Re: Topband: Multiple Ground Systems (score: 1): Author: "Brian Machesney" <nekvtster@gmail.com>; Date: Sun, 19 Aug 2007 13:15:20 -0400; Forgive my ignorance, as I am not an antenna engineer. I apologize for a long post, but I would like to hear the opinions of the professionals on the line. Between jobs last year, I spent nine months; /archives//html/Topband/2007-08/msg00058.html (9,058 bytes)
13. Re: Topband: Multiple Ground Systems (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 19 Aug 2007 11:50:42 -0700; One of the major shortcomings of the NEC2 engine is how it deals with the earth. The more expensive NEC4 engine is regarded as more accurate. And as the real pros (like W8JI and N6LF) will tell you,; /archives//html/Topband/2007-08/msg00059.html (10,455 bytes)
14. Re: Topband: Multiple Ground Systems (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 19 Aug 2007 18:32:49 -0400; I would think that a defining Any screen that reflects or serves as a ground, even a solid sheet, has voltage differences along its length otherwise it couldn't have current flow. The real issue is c; /archives//html/Topband/2007-08/msg00060.html (8,941 bytes)

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