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1. [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Sun, 6 Mar 2016 17:32:37 -0500; What size rivets does the XR series antennas use in the elements? I understand the new antennas use 2 sets of opposing blind rivets. -- 73 Roger (K8RI) -- This email has been checked for viruses by A; /archives//html/Towertalk/2016-03/msg00067.html (6,743 bytes)
2. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: Larry <lknain@nc.rr.com>; Date: Sun, 6 Mar 2016 19:39:29 -0500; In the early days C3, EF 180B, and 240 generally used 0.125 inch rivets on the elements. The 180B had some 0.25 inch rivets as well if I recall. Booms used 0.25 inch rivets. The C3, for example, gene; /archives//html/Towertalk/2016-03/msg00068.html (7,270 bytes)
3. [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Mon, 7 Mar 2016 19:54:32 -0800; In the early days C3, EF 180B, and 240 generally used 0.125 inch rivets on the elements. The 180B had some 0.25 inch rivets as well if I recall. Booms used 0.25 inch rivets. The C3, for example, gene; /archives//html/Towertalk/2016-03/msg00072.html (8,945 bytes)
4. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Mon, 7 Mar 2016 23:52:31 -0500; Good advise Jim, My C19XR uses 3 rivets in a row at each element joint. I understand that they may have gone to 6 using two sets of 3 opposing rivets. That's the way I plan on repairing the ends of t; /archives//html/Towertalk/2016-03/msg00073.html (11,535 bytes)
5. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: Larry <lknain@nc.rr.com>; Date: Tue, 8 Mar 2016 05:08:00 -0500; I had failure on the 240XL element to boom plate where the rivets elongated the holes and the element eventually fell off. Bringing down a 2 el 40M yagi with only one element is not a lot of fun. I w; /archives//html/Towertalk/2016-03/msg00075.html (12,651 bytes)
6. [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 8 Mar 2016 07:12:05 -0800; Good advise Jim, My C19XR uses 3 rivets in a row at each element joint. I understand that they may have gone to 6 using two sets of 3 opposing rivets. That's the way I plan on repairing the ends of t; /archives//html/Towertalk/2016-03/msg00079.html (12,727 bytes)
7. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "N2TK, Tony" <tony.kaz@verizon.net>; Date: Tue, 08 Mar 2016 12:00:40 -0500; A number of years ago the C3E elements kept loosening. We always had an updraft at the edge of a cliff. Force 12 told us to add additional rivets. At each joint we had 3 rows of 3 rivets (total of 9); /archives//html/Towertalk/2016-03/msg00083.html (10,690 bytes)
8. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Bert Almemo" <balmemo@sympatico.ca>; Date: Tue, 8 Mar 2016 15:22:32 -0500; I learned long time ago that using pop rivets, blind or not, don't make for a good electrical connection. For all antennas, using aluminum tubing, I've used self tapping screws for the last 30 yrs an; /archives//html/Towertalk/2016-03/msg00093.html (13,280 bytes)
9. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Tue, 8 Mar 2016 19:33:15 -0500; There is plenty of overlap between the tubes to be riveted and they are a nice slip fit. The sections to overlap are coated with Penetrox-A and inserted to the proper depth. The line of rivets pull t; /archives//html/Towertalk/2016-03/msg00110.html (15,617 bytes)
10. [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 8 Mar 2016 19:45:51 -0800; I learned long time ago that using pop rivets, blind or not, don't make for a good electrical connection. For all antennas, using aluminum tubing, I've used self tapping screws for the last 30 yrs an; /archives//html/Towertalk/2016-03/msg00112.html (9,716 bytes)
11. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Bert Almemo" <balmemo@sympatico.ca>; Date: Wed, 9 Mar 2016 00:09:45 -0500; Jim, While I agree with most of you're writing I think you'll be hard pressed to get a solid 9 square inches of surface contact in your 1 inch tube with 3 inches of overlap. Maybe if you put in a lot; /archives//html/Towertalk/2016-03/msg00114.html (11,061 bytes)
12. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 8 Mar 2016 22:17:48 -0800; @@@ Stainless steel does not conduct RF worth a damn. F12 uses 12-24 SS screws to make the balun connections... between a pair of SS nuts and SS flatwashers. I also tried the same stunt, using SS for; /archives//html/Towertalk/2016-03/msg00115.html (14,239 bytes)
13. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 9 Mar 2016 05:44:04 -0800; While I agree with most of you're writing I think you'll be hard pressed to get a solid 9 square inches of surface contact in your 1 inch tube with 3 inches of overlap. Maybe if you put in a lot of S; /archives//html/Towertalk/2016-03/msg00119.html (8,878 bytes)
14. [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Wed, 9 Mar 2016 07:55:07 -0800; Don't forget the capacitance. 9 square inches separated by 1 mil is about 2000 pF at 14 MHz, that's an impedance of about 5 ohms. Even if there's a bigger gap (say, 3 mils) the impedance goes up to 1; /archives//html/Towertalk/2016-03/msg00126.html (8,927 bytes)
15. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: TexasRF--- via TowerTalk <towertalk@contesting.com>; Date: Wed, 9 Mar 2016 11:25:12 -0500; There are plenty of reasons that this capacitance scenario is bogus. It would be nearly impossible to maintain a spacing of 1 mil or 3 mils between conductors with the pressure created by the element; /archives//html/Towertalk/2016-03/msg00129.html (10,914 bytes)
16. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Wed, 9 Mar 2016 09:45:15 -0800; I'm going to row against the rivet tide here a bit. When I bought a well used F12 EF180C to retrofit with a Tornado variable inductor, I found a significant number of rivets loose or missing entirely; /archives//html/Towertalk/2016-03/msg00132.html (14,250 bytes)
17. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 9 Mar 2016 10:13:05 -0800; On 3/9/16 8:25 AM, TexasRF@aol.com wrote: There are plenty of reasons that this capacitance scenario is bogus. It would be nearly impossible to maintain a spacing of 1 mil or 3 mils between conductor; /archives//html/Towertalk/2016-03/msg00133.html (9,923 bytes)
18. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Jeff DePolo" <jd0@broadsci.com>; Date: Wed, 09 Mar 2016 13:33:36 -0500; It seems to me what's really being overlooked is the skin effect. Regardless of what method(s) are used to mechanically secure the joints, I have to believe that slit tubing and a hose clamp placed; /archives//html/Towertalk/2016-03/msg00134.html (9,088 bytes)
19. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Bert Almemo" <balmemo@sympatico.ca>; Date: Wed, 9 Mar 2016 13:40:05 -0500; Very true! Forgot about the capacitance. Bert VE3NR to the a clamp Don't forget the capacitance. 9 square inches separated by 1 mil is about 2000 pF at 14 MHz, that's an impedance of about 5 ohms. Ev; /archives//html/Towertalk/2016-03/msg00136.html (10,296 bytes)
20. Re: [TowerTalk] F12 C19XR Rivets (score: 1): Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>; Date: Wed, 9 Mar 2016 14:55:00 -0500; But with two rows of rivets expecting intimate contact over a sizable area is legitimate. Three rows, even more so. I do agree that the first rivet is much too close to the end of the outer tube. I h; /archives//html/Towertalk/2016-03/msg00140.html (14,181 bytes)

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