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1. Re: [TowerTalk] Newtons to Sq Ft ? (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Fri, 16 Oct 2009 12:11:17 -0800; 600 newtons = 134.885366 pounds force 125 kilometers per hour = 77.671399 miles per hour PSF = .004V^2 PSF @ 77.67 mph = .004(77.67)^2 PSF = 24.13 sq ft = (total pounds force / PSF) sq ft = 134.9/24.; /archives//html/Towertalk/2009-10/msg00260.html (8,794 bytes)
2. Re: [TowerTalk] Request for engineering help (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Tue, 02 Jun 2009 08:28:45 -0800; The issue is not the weight of the antenna, but the surface area it presents to the wind. Rohn's data on bracketed towers is pretty sparse. They show one example with a bracket at 66' on a 90' tower; /archives//html/Towertalk/2009-06/msg00030.html (9,960 bytes)
3. Re: [TowerTalk] Changing Rotors in LM-470 (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sun, 31 May 2009 09:16:01 -0800; I helped a friend do this once. We tilted the LM-470 over, disassembling the booms of several antennas to let the tower get horizontal. Then we slid the mast out almost all the way, and pulled the ro; /archives//html/Towertalk/2009-05/msg00531.html (9,360 bytes)
4. Re: [TowerTalk] Mast Sizing (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Wed, 13 May 2009 06:24:36 -0800; -- Try here: http://www.math.niu.edu/KARC/mast/ Dave Hachadorian, K6LL Yuma, AZ . _______________________________________________ _______________________________________________ TowerTalk mailing lis; /archives//html/Towertalk/2009-05/msg00284.html (7,669 bytes)
5. Re: [TowerTalk] LADDER LINE (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 23 Apr 2009 08:12:47 -0800; -- Here's a source of true ladder line: http://www.trueladderline.com/ Dave Hachadorian, K6LL Yuma, AZ . _______________________________________________ ______________________________________________; /archives//html/Towertalk/2009-04/msg00682.html (8,207 bytes)
6. Re: [TowerTalk] Ladderline. What Kind ? (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 23 Apr 2009 07:36:35 -0800; -- When I was about 18 years old, I made 100' of ladderline using #14 hard-drawn copper wire and those little 2" ceramic insulators made by E.F. Johnson. I had a hell of a time getting the wire throu; /archives//html/Towertalk/2009-04/msg00672.html (8,899 bytes)
7. [TowerTalk] hugesnet and crackup towers (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 26 Mar 2009 08:38:16 -0800; This is the second classic typo today. The first one was about the crackup tower. Keep 'em coming. Dave Hachadorian, K6LL Yuma, AZ _______________________________________________ ___________________; /archives//html/Towertalk/2009-03/msg00775.html (7,392 bytes)
8. Re: [TowerTalk] KT34A problem (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sun, 15 Feb 2009 15:46:08 -0800; If the swr is totally non-responsive like that, it is likely either an instrument problem, or a problem in the driven elements and feeding system. Try this: 1. Try a real swr bridge, instead of an an; /archives//html/Towertalk/2009-02/msg00367.html (9,632 bytes)
9. Re: [TowerTalk] Soldering irons (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sat, 31 Jan 2009 11:04:28 -0800; This thread reminded me that I need a new soldering gun. My old 100/150W one is held together with duct tape. I just ordered a Weller 200/260W (mentioned on the K3LR website) from these guys: http://; /archives//html/Towertalk/2009-01/msg00499.html (7,527 bytes)
10. Re: [TowerTalk] Tool name? (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 29 Jan 2009 16:36:10 -0800; Ratcheting box wrench Dave Hachadorian, K6LL Yuma, AZ _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com h; /archives//html/Towertalk/2009-01/msg00422.html (8,309 bytes)
11. Re: [TowerTalk] US Tower Dayton AC Motor issue (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sat, 13 Sep 2008 12:47:52 -0700; -- It sounds like there is a problem with the starting capacitor, centrifugal switch, or starting winding. I recommend removing the motor and taking it to an electric motor repair shop for diagnosis/; /archives//html/Towertalk/2008-09/msg00232.html (7,838 bytes)
12. Re: [TowerTalk] Wanted! Sixpak Antenna Switch (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sat, 13 Sep 2008 10:54:18 -0700; -- I never had such a problem with my Six-Pak using a full regulated 13.8 vdc drive. When I added some steering diodes into the relay selection logic to do some specialized switching, the relays woul; /archives//html/Towertalk/2008-09/msg00230.html (8,621 bytes)
13. Re: [TowerTalk] ICE-419a Bandpass filter (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Tue, 22 Jul 2008 16:28:57 -0700; -- I don't know how stable polypropylene would be at 14 MHz in a tuned circuit. The ones I've used successfully in the past are the mica CD15, CD19, CDV16 and CDV19, all on page 838 of the Mouser cat; /archives//html/Towertalk/2008-07/msg00589.html (8,536 bytes)
14. Re: [TowerTalk] ICE-419a Bandpass filter (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Tue, 22 Jul 2008 14:09:08 -0700; By the way, you can unsolder the capacitors and measure the capacitance value pretty accurately using an antenna analyzer in the capacitance mode. Look for large changes in value. I would bet on the; /archives//html/Towertalk/2008-07/msg00584.html (7,958 bytes)
15. Re: [TowerTalk] ICE-419a Bandpass filter (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Tue, 22 Jul 2008 13:55:14 -0700; My buddy W7WW in Yuma got a list of capacitors from ICE after he smoked 10 meters. I just talked to him on the phone. He says, for 20 meters: resonating: 2 - 940pf each coupling: 240pf As I remember,; /archives//html/Towertalk/2008-07/msg00582.html (7,949 bytes)
16. Re: [TowerTalk] G5RV vs. 2 element yagi (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sat, 21 Jun 2008 12:55:06 -0700; I think a 2 el tribander will beat the pants off a G5RV on 10 15 and 20, even at 25 feet. On those bands the G5RV pattern is complex, and the station you are trying to work could be in a deep null. I; /archives//html/Towertalk/2008-06/msg00419.html (9,444 bytes)
17. Re: [TowerTalk] Removing a Rotator (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 12 Jun 2008 00:14:43 -0500; The problem with replacing a rotator in a crankup is that you have to almost totally remove the mast to make room to get the rotator out the top of the top section. I helped a friend do that once wit; /archives//html/Towertalk/2008-06/msg00260.html (8,009 bytes)
18. Re: [TowerTalk] F12 80M beam (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Fri, 18 Apr 2008 10:15:52 -0500; -- Steve, analyzers, especially on physically large antennas. I recommend trying a real swr bridge as your next move. Dave Hachadorian, K6LL Yuma, AZ . _______________________________________________; /archives//html/Towertalk/2008-04/msg00451.html (7,335 bytes)
19. Re: [TowerTalk] XM-240 Tuning Issues (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sat, 05 Apr 2008 11:06:05 -0500; Before you bring it down, try a real swr bridge/transmitter. Sometimes those analyzers get fooled by stray rf. The XM-240 has a matching network? My 40-2CD has just a split dipole with no matching ne; /archives//html/Towertalk/2008-04/msg00071.html (8,361 bytes)
20. Re: [TowerTalk] Using a dip meter (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Thu, 20 Mar 2008 22:59:29 -0500; Yes. That's the problem. Remove the feedline and put a temporary jumper across the insulator, and you will read the resonant frequency of the loop. You could build your little coupling loop into this; /archives//html/Towertalk/2008-03/msg00388.html (9,523 bytes)

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