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1. [TowerTalk] vertical separation between c4 and uhf/vhf? (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Mon Jul 28 07:45:12 2003; I modeled a Force 12 C3SS tribander and a M2 6m7jhv on a 16' mast. I found that if I had the tribander and the 6m antenna any closer than 16' then the front to back on the 6m suffered. There was esse; /archives//html/Towertalk/2003-07/msg00448.html (9,444 bytes)
2. [TowerTalk] Tower Surveying Tools? (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Mon Jun 9 17:13:28 2003; Indeed. But Rick's idea is very close. One could use two tapes and mark off equal distances chordally and radially and this will produce a hexagon. Just pick the alternate points and that should do i; /archives//html/Towertalk/2003-06/msg00155.html (11,250 bytes)
3. [TowerTalk] Aluminum Plate (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Mon Jun 16 07:51:07 2003; Check out dxengineering.com. They have ready made boom to mast plates that could be used in F12 configuration - with at most drilling one hole. Regards, Raj, N2RD Greetings, I'm look to purchase on 3; /archives//html/Towertalk/2003-06/msg00209.html (7,345 bytes)
4. [TowerTalk] A4S Traps (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Fri May 2 13:09:32 2003; -- Rajiv Dewan Simon School of Business University of Rochester Rochester, NY 14627 http://rdewan.simon.rochester.edu dewan@simon.rochester.edu Asst: Cynthia Baylark 585 273 4677; /archives//html/Towertalk/2003-05/msg00008.html (7,976 bytes)
5. [TowerTalk] WRC 2/2 Over a C3SS/C4SS? (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Thu Apr 3 12:49:52 2003; I have a C3SS that is 8' over a Cushcraft D3W (Warc Band Dipole). I modeled it on EZNEC before I put it up. At that distance it seems fine. I have the dipole parallel with the elements of the yagi. Y; /archives//html/Towertalk/2003-04/msg00038.html (8,156 bytes)
6. [Towertalk] Service drop danger (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Tue, 12 Nov 2002 13:16:08 -0500; There is yet another possibility that may allow you to "eat the cake and have it too." The idea is to construct the 80m loop in two section on either side of the service line and connect the two halv; /archives//html/Towertalk/2002-11/msg00236.html (8,992 bytes)
7. [Towertalk] andros 2 piece N connectors (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Sat, 5 Oct 2002 10:34:56 -0400; I really like these connectors. Unlike regular N, these do not come apart. The assembly of the inner part is much like assembling an UHF connector. To measure, I just line up the coax with the connec; /archives//html/Towertalk/2002-10/msg00174.html (9,966 bytes)
8. [Towertalk] Guy Anchor Question (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Wed, 4 Sep 2002 08:11:52 -0400; Ya gotta think of the soil. My guess is that Mike, with 4" screw anchors holding up the 160' beast has good strong compacted clay. These anchors would hardly suffice if you have essentially dune sand; /archives//html/Towertalk/2002-09/msg00135.html (11,995 bytes)
9. [Towertalk] Models and real world (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Thu, 11 Jul 2002 08:39:00 -0400; A simple explanation might be that the takeoff angle at which you empirically measured was not close to 90 degrees. The difference in gain between perfect ground and medium ground, predicted by Eznec; /archives//html/Towertalk/2002-07/msg00283.html (11,970 bytes)
10. [Towertalk] is an LP a good sloper top hat? (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Fri, 7 Jun 2002 16:22:29 -0400; I just did some quick modeling on Eznec using a 6m 30' boom yagi model I had: Case 1: Only mast (tower) 45' tall, 4" dia over perfect ground, 3.65MHz Source impedance 13.3 - 146j ohms, SWR (50ohms) 3; /archives//html/Towertalk/2002-06/msg00090.html (8,234 bytes)
11. [Towertalk] Burning ?'s (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Sat, 25 May 2002 18:52:34 -0000; I used some yagi models I had on Eznec to get some quick answers. Before I mention the results - a big caveat. While there is some regularity in gain, f/b and boom length, number of elements at the d; /archives//html/Towertalk/2002-05/msg00687.html (8,746 bytes)
12. [Towertalk] limitations of stacking (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Fri, 22 Mar 2002 11:54:05 -0500; I would think the change in gain would depend on the arrival angle, the heights of the two antennas and the quality of the ground (reflection losses). Where does the 3db rule of thumb come from? Rega; /archives//html/Towertalk/2002-03/msg00556.html (8,901 bytes)
13. [TowerTalk] W2DU Balun's? (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Mon, 4 Feb 2002 23:53:56 -0000; Indeed. I have had very bad experiences with commercially available W2DU baluns for around $20 or so. All kinds of problems ranging from broken solder connection inside the pvc tube, broken beads, to; /archives//html/Towertalk/2002-02/msg00138.html (13,464 bytes)
14. [TowerTalk] believing antenna manufacturers (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Wed, 30 Jan 2002 16:37:02 -0500; There are two ways a structure can withstand wind forces: 1. Be very robust (most of the older antennas, if they could survive) 2. Be compliant (like F12 antennas) At least for tall skyscrapers, 2 is; /archives//html/Towertalk/2002-01/msg00644.html (10,233 bytes)
15. [TowerTalk] Stacking quandry (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Wed, 17 Oct 2001 15:42:56 -0400; Based on my modeling experience (eznec) , getting the phasing right is a big deal. I recently stacked two 6m antennas. I modelled two indentical 5 element antennas on 19' boom, vertically stacked wit; /archives//html/Towertalk/2001-10/msg00343.html (12,027 bytes)
16. [TowerTalk] vertical antennas (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Wed, 24 Oct 2001 13:26:42 -0400; An early adopter of Force 12's 160VX (56' tall, linearly loaded vertical for the 160 band) told me that after one season of 4 elevated radials, he installed an extensive ground radial system. It impr; /archives//html/Towertalk/2001-10/msg00495.html (11,336 bytes)
17. [TowerTalk] C31XR (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Mon, 29 Oct 2001 08:50:14 -0500; A common failure with 9913 is water ingress. This could increase the attenuation, making the SWR even closer to 1. A good test is to hook up a non-matching load, say 150 ohms (my choice, since my my; /archives//html/Towertalk/2001-10/msg00551.html (7,911 bytes)
18. [TowerTalk] Water in tower (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Thu, 27 Sep 2001 16:09:01 -0400; A recommended solution is to have a bed of construction gravel at the bottom and the rest the tower base legs on them before pouring the concrete. This essentially provides a dry-well type setup and; /archives//html/Towertalk/2001-09/msg00715.html (9,369 bytes)
19. [TowerTalk] (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Tue, 24 Jul 2001 13:31:09 -0000; There is one other option to consider: two parallel dipoles, fed 180 degrees out of phase - the W8JK antenna. The radiation from the two elements cancels straight up and the combination has a low ang; /archives//html/Towertalk/2001-07/msg00451.html (8,169 bytes)
20. [TowerTalk] Re: Digging holes (score: 1): Author: n2rd@arrl.net (Rajiv Dewan, N2RD); Date: Fri, 23 Mar 2001 00:20:10 -0000; Naah! Its gotta be a rare one to work rare ones. A P5 card is best. Regards, Rajiv, N2RD -- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative re; /archives//html/Towertalk/2001-03/msg00461.html (9,781 bytes)

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