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1. Topband: Insulator problems (score: 1): Author: Greg - ZL3IX <zl3ix@inet.net.nz>; Date: Sat, 14 Dec 2013 15:19:54 +1300; The Tx antenna I have been using very successfully for the last 8+ years, is a top-fed vertical. This feed arrangement requires the yagi used for top loading to be insulated from the mast. I have bee; /archives//html/Topband/2013-12/msg00152.html (7,881 bytes)
2. Re: Topband: Insulator problems (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sat, 14 Dec 2013 06:05:56 -0500; 2) I always thought that nylon was a pretty good dielectric, and did not expect problems, especially at 1.8 MHz. The gap in the insulator is 7.5mm, or about 0.3". I estimate that there will be around; /archives//html/Topband/2013-12/msg00157.html (8,556 bytes)
3. Re: Topband: Insulator problems (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Sat, 14 Dec 2013 08:22:05 -0500; Greg, One property you should look at when deciding the material to use for your insulator (especially if exposed to water) is a property called water absorption and normally it's listed as a weight; /archives//html/Topband/2013-12/msg00158.html (9,125 bytes)
4. Re: Topband: Insulator problems (score: 1): Author: Greg - ZL3IX <zl3ix@inet.net.nz>; Date: Sun, 15 Dec 2013 06:09:54 +1300; Many thanks to everyone who commented on the above. The consensus is that nylon is a particularly bad choice of insulator for high field environments, even on Topband. Tomorrow I will be looking for; /archives//html/Topband/2013-12/msg00159.html (7,144 bytes)
5. Re: Topband: Insulator problems (score: 1): Author: Jim GM <jim.gmforum@gmail.com>; Date: Mon, 16 Dec 2013 09:58:28 -0600; Not sure what your replacing if it is a round insulator piece for 2 pipes or stand off type insulator for matching section or what? Try fiberglass rod material or Teflon blocks depends on application; /archives//html/Topband/2013-12/msg00172.html (7,787 bytes)
6. Re: Topband: Insulator problems (score: 1): Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>; Date: Mon, 16 Dec 2013 11:16:31 -0500; You might consider polycarbonate. (GE calls it "Lexan") It's very strong both mechanically and electrically, and it's machinable. 73, Charlie, K4OTV Not sure what your replacing if it is a round insu; /archives//html/Topband/2013-12/msg00173.html (8,720 bytes)
7. Re: Topband: Insulator problems (score: 1): Author: "John Harden, D.M.D." <jhdmd@bellsouth.net>; Date: Mon, 16 Dec 2013 11:31:50 -0500; Because of a current/voltage node I was toasting SO-239's (FORGET Type "N"'s).... I went to Amphenol Type "HN" connectors in the 160 tuning box at the base of the tower. It NEVER arcs now, ever.....; /archives//html/Topband/2013-12/msg00174.html (8,943 bytes)
8. Re: Topband: Insulator problems (score: 1): Author: Bill Wichers <billw@waveform.net>; Date: Mon, 16 Dec 2013 19:06:09 +0000; Delrin is a trademark for acetal. Acetal is the generic name so you'll have a lot better time finding acetal most likely. My recommendation is to get the *black* acetal as it will hold up much better; /archives//html/Topband/2013-12/msg00177.html (10,091 bytes)
9. Re: Topband: Insulator problems (score: 1): Author: GALE STEWARD <k3nd@yahoo.com>; Date: Tue, 17 Dec 2013 08:01:56 -0800 (PST); The HN is a tough connector. At my former employer we used to run close to 2.5 KW thru them into fairly reactive loads. This was in the 130-180 Mhz freq range. I don't remember ever seeing one fail.; /archives//html/Topband/2013-12/msg00190.html (10,091 bytes)
10. Re: Topband: Insulator problems (score: 1): Author: HAROLD SMITH JR <w0rihps@sbcglobal.net>; Date: Tue, 17 Dec 2013 10:03:16 -0800 (PST); The HN is a tough connector. At my former employer we used to run close to 2.5 KW thru them into fairly reactive loads. This was in the 130-180 Mhz freq range. I don't remember ever seeing one fail.; /archives//html/Topband/2013-12/msg00194.html (9,533 bytes)
11. Re: Topband: Insulator problems (score: 1): Author: W9UCW@aol.com; Date: Tue, 17 Dec 2013 14:09:43 -0500 (EST); When I lost my last set of monster buss bar ceramic insulators to breakage due to a broken guy line on the tower, I replaced them with artificial wood. I used 4 X 4's. It machines easily and works fl; /archives//html/Topband/2013-12/msg00196.html (8,518 bytes)
12. Re: Topband: Insulator problems (score: 1): Author: Herb Schoenbohm <herbs@vitelcom.net>; Date: Tue, 17 Dec 2013 15:19:23 -0400; My 160 meter ATU uses an old military box with the original behive feed thru insulator that is starting to crumble. I haven't been able to find a pocelin feed thu of that size (about 3'') and the one; /archives//html/Topband/2013-12/msg00197.html (9,449 bytes)
13. Re: Topband: Insulator problems (score: 1): Author: "Ronald Gorski" <R.Gorski@Astronautics.com>; Date: Tue, 17 Dec 2013 13:27:57 -0600; Herb, Try Fair Radio Sales in Lima, OH The catalog I have shows a 5-1/4in diameter thru panel insulator. Ron N9AU My 160 meter ATU uses an old military box with the original behive feed thru insulato; /archives//html/Topband/2013-12/msg00199.html (9,921 bytes)
14. Re: Topband: Insulator problems (score: 1): Author: "Doug Scribner" <dscribner@myfairpoint.net>; Date: Tue, 17 Dec 2013 14:29:20 -0500; Try here Herb, http://www.surplussales.com/antennas/antennas-6.html http://www.daburn.com/10-58ceramicfeed-thruinsulators.aspx I have not purchased from either of these 2 places... Doug - K1ZO -- Ori; /archives//html/Topband/2013-12/msg00200.html (10,268 bytes)
15. Re: Topband: Insulator problems (score: 1): Author: "Shoppa, Tim" <tshoppa@wmata.com>; Date: Tue, 17 Dec 2013 19:30:21 +0000; Some of the old-school ham radio suppliers sell/stock Daburn porcelain insulators, or you can get them direct from Daburn. e.g. Daburn 10-52: http://www.daburn.com/10-58ceramicfeed-thruinsulators.asp; /archives//html/Topband/2013-12/msg00201.html (9,751 bytes)
16. Re: Topband: Insulator problems (score: 1): Author: Herb Schoenbohm <herbs@vitelcom.net>; Date: Tue, 17 Dec 2013 17:35:40 -0400; Thanks Tim. I might try one of these if I can get them to send them in single unit quantities. The one I currently use is a bowl type but about 3 inches on the flange. I guess for a 160 ATU I should; /archives//html/Topband/2013-12/msg00202.html (11,163 bytes)

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