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1. Topband: Fw: 25G insulators (score: 1): Author: "George & Marijke Guerin" <gmguerin@voyager.net>; Date: Thu, 28 Aug 2003 11:56:35 -0400; Bruce: Indeed the 25G base insulators we used for W8TOP came from a small shop in Georgia. I would suggest you go to Allan Bond, president of Max-Gain Systems: He has a website http://www.mgs4u.com/f; /archives//html/Topband/2003-08/msg00133.html (6,595 bytes)
2. RE: Topband: Fw: 25G insulators (score: 1): Author: W6IZT@aol.com; Date: Fri, 29 Aug 2003 08:44:53 -0400; The insulators that K8GG referred to are made by Antenna Mart in GA. They are also available from Allen Bond at MaxGain Systems in Marietta GA 73 Gregg _______________________________________________; /archives//html/Topband/2003-08/msg00138.html (6,571 bytes)
3. RE: Topband: Fw: 25G insulators (score: 1): Author: SteamBoilers@aol.com; Date: Fri, 29 Aug 2003 14:12:02 EDT; " The insulators that K8GG referred to are made by Antenna Mart in GA. They are also available from Allen Bond at MaxGain Systems in Marietta GA " Why not shunt feed it, Its a lot cheaper and more us; /archives//html/Topband/2003-08/msg00139.html (6,775 bytes)
4. Re: Topband: Fw: 25G insulators (score: 1): Author: "C L Dietz" <cdietz@swbell.net>; Date: Fri, 29 Aug 2003 15:01:40 -0500; thunder I agree with Allen. I have shunt fed several towers and they all worked extremely well. Plus, it is better when you have antennas on the tower with feed lines that have to bridge the gap at; /archives//html/Topband/2003-08/msg00140.html (7,435 bytes)
5. Re: Topband: Fw: 25G insulators (score: 1): Author: "Milt Jensen" <n5ia@zia-connection.com>; Date: Fri, 29 Aug 2003 17:19:00 -0700; MUCH smaller bandwidth unless you want to do remote control of the shunt capacitor. It is well worth the effort (coin and sweat) to make the antenna a true Ground Plane. Milt, N5IA They thunder _____; /archives//html/Topband/2003-08/msg00142.html (8,463 bytes)
6. Re: Topband: Fw: 25G insulators (score: 1): Author: "EUGENE SMAR" <ersmar@comcast.net>; Date: Fri, 29 Aug 2003 20:31:50 -0400; Here, here! I agree with Alan. If I can get my tower to work on 160M in my small backyard, anyone can. 73 de Gene Smar AD3F They thunder _______________________________________________ Topband mailin; /archives//html/Topband/2003-08/msg00143.html (8,428 bytes)
7. Re: Topband: Fw: 25G insulators (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Fri, 29 Aug 2003 14:00:57 -0700; "Why not shunt feed it, Its a lot cheaper and more user friendly in a thunder storm and works just as well." == I totally agree. Also you don't have to be concerned about the precise height for reson; /archives//html/Topband/2003-08/msg00144.html (7,285 bytes)
8. Re: Topband: Fw: 25G insulators (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Fri, 29 Aug 2003 20:20:43 -0700; "MUCH smaller bandwidth unless you want to do remote control of the shunt capacitor. It is well worth the effort (coin and sweat) to make the antenna a true Ground Plane." == Not true if the shunt-fe; /archives//html/Topband/2003-08/msg00145.html (9,186 bytes)
9. Re: Topband: Fw: 25G insulators (score: 1): Author: "Donald Chester" <k4kyv@hotmail.com>; Date: Sat, 30 Aug 2003 07:46:16 +0000; A full size 160 vertical will draw big arcs during thunderstorms. At NR5M they had to short the vertical to ground with an auto battery jumper cable. Better still, install a heavy duty spark gap acro; /archives//html/Topband/2003-08/msg00146.html (9,038 bytes)
10. Re: Topband: Fw: 25G insulators (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 30 Aug 2003 05:29:12 -0400; The idea shunt feeding the tower provides "lightning protection" is more hype than fact. I have owned several insulated series-fed and shunt fed verticals. The worse lightning damage (by far) has bee; /archives//html/Topband/2003-08/msg00148.html (8,971 bytes)
11. Re: Topband: Fw: 25G insulators (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 30 Aug 2003 05:55:00 -0400; I have something on my web page about voltage and bandwidth of gamma matches. This is similar to the "loading coil thing", where voltage across any series reactance is a function of current through t; /archives//html/Topband/2003-08/msg00149.html (8,713 bytes)
12. Re: Topband: Fw: 25G insulators (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 30 Aug 2003 08:02:42 -0400; At 08:20 PM 8/29/03 -0700, Earl W Cunningham wrote: 3) Because the tower is grounded, a lightning strike is conducted directly to ground, thus eliminating damage to anything (my tower in Houston was; /archives//html/Topband/2003-08/msg00150.html (9,775 bytes)
13. Re: Topband: Fw: 25G insulators (score: 1): Author: "Milt Jensen, N5IA" <n5ia@zia-connection.com>; Date: Sat, 30 Aug 2003 06:34:36 -0700; Good morning Earl and others, My experience is NOT this result. I had a full sized 1/4 WL of Rohn 25, ground mounted and grounded, that I Gamma matched. 2:1 bandwidth was 20 kHz. I converted the same; /archives//html/Topband/2003-08/msg00151.html (9,561 bytes)
14. Re: Topband: Fw: 25G insulators (score: 1): Author: "Doug Waller" <NX4D@comcast.net>; Date: Sat, 30 Aug 2003 12:01:47 -0400; Earl, K6SE: Per NASA commissioned study back in the 80's, most lightning strikes are from the ground up. Two metal poles were erected a short distance apart, one grounded, the other base-insulated. T; /archives//html/Topband/2003-08/msg00153.html (10,167 bytes)
15. Re: Topband: Fw: 25G insulators (score: 1): Author: Earl W Cunningham <k6se@juno.com>; Date: Sat, 30 Aug 2003 09:14:18 -0700; "With 1500 watts from a 50 ohm line into a series capacitor, line current (5.5 amperes) times reactance equals RMS voltage across capacitor. A 300 pF capacitor set at 120pf (736 ohms X) would have 5.; /archives//html/Topband/2003-08/msg00154.html (8,527 bytes)
16. Re: Topband: Fw: 25G insulators (score: 1): Author: "Donald Chester" <k4kyv@hotmail.com>; Date: Sat, 30 Aug 2003 23:04:44 +0000; The arc gaps across the insulated section is a simple and very effective way of taking care of the static charge It is much better to use ONE insulator to support the tower at a pivot point than to u; /archives//html/Topband/2003-08/msg00157.html (9,639 bytes)
17. Re: Topband: Fw: 25G insulators (score: 1): Author: "Harold Smith" <price.smith@worldnet.att.net>; Date: Sat, 30 Aug 2003 18:18:24 -0500; Pete: I believe that this has been discussed by PolyPhaser in their book on grounding. Very high voltages will be induced in all conductors on the tower, they are like a secondary of a transformer. T; /archives//html/Topband/2003-08/msg00158.html (9,565 bytes)
18. Re: Topband: Fw: 25G insulators (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 30 Aug 2003 20:23:36 -0400; Actually there is a good case for using a thick gamma conductor. Assuming the tower is resonant, all the gamma reactance does is cancel inductive reactance of the shunt wire. Thinner and/or longer s; /archives//html/Topband/2003-08/msg00159.html (9,822 bytes)
19. Re: Topband: Fw: 25G insulators (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sat, 30 Aug 2003 21:06:03 -0400; any The ground system is very important, but how we route and connect cables is the single most critical thing. Lightning is virtually all rapidly stepped waveforms, and behaves exactly like RF. As; /archives//html/Topband/2003-08/msg00160.html (10,009 bytes)
20. Re: Topband: Fw: 25G insulators (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 30 Aug 2003 21:18:14 -0400; At 09:06 PM 8/30/03 -0400, Tom Rauch wrote: The most benign place is the middle of the tower, where a Faraday cage is formed by the structure itself. That's where the sensitive cables should be route; /archives//html/Topband/2003-08/msg00161.html (10,733 bytes)

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