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Total 1484 documents matching your query.

1. [TowerTalk] driving ground rods (score: 1)
Author: richard@karlquist.com (Rick Karlquist)
Date: Mon Aug 4 14:30:01 2003
AKA Harbor Freight, it's been posted on this reflector a number of times. This hammer is SDS, not SDS-Max. AFAIK, ground rod driver bits are only available in SDS-Max and Spline. Do you know where to
/archives//html/Towertalk/2003-08/msg00073.html (7,549 bytes)

2. [TowerTalk] MA-550 advice... (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Tue Aug 19 10:55:16 2003
I was told the MA-550 was easy to recable. Am I missing something? I was planning to recable mine soon. Can you give me any tips? Rick N6RK
/archives//html/Towertalk/2003-08/msg00669.html (7,698 bytes)

3. [TowerTalk] MA-550 advice... (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Tue Aug 19 22:07:16 2003
The part of the cable I can see looks perfect. However, they are 20 years old and I never lubed them (didn't know any better). Is there a chance the cable is rusted in an area that is not visible? P
/archives//html/Towertalk/2003-08/msg00690.html (7,971 bytes)

4. [TowerTalk] Rotator questions (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Wed Jul 16 01:05:22 2003
My tower project has finally progressed to the point that I need to install a rotator. The antenna will be a 4 element steppir Yagi, with a wind area of 9 sq ft, 32 foot boom. I currently have the fo
/archives//html/Towertalk/2003-07/msg00242.html (7,738 bytes)

5. [TowerTalk] Van Gordon 1:1 (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri Jul 18 01:06:46 2003
These baluns have two major disadvanges: 1. They are *voltage* baluns. In all antenna applications I know of, you want a *current* balun. 2. They have excessive leakage and magnetizing inductance. T
/archives//html/Towertalk/2003-07/msg00290.html (7,322 bytes)

6. [TowerTalk] MA-550 Tubular Tower (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Wed Jul 30 11:42:18 2003
Stiffness (not strength) of a tube of a given wall thickness is roughly proportional to the *cube* of the diameter. A pipe tower only 2 inches in diameter for the top 20 feet is nowhere near as stiff
/archives//html/Towertalk/2003-07/msg00510.html (8,924 bytes)

7. [TowerTalk] Shielded balanced line NOT using coax (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Thu Jul 31 10:23:53 2003
I have been kicking around the idea of making my own air dielectric coax using 2 or 3 inch irrigation tubing for the outer conductor. I had just about exactly the same idea with the balls. I had bee
/archives//html/Towertalk/2003-07/msg00522.html (10,702 bytes)

8. [TowerTalk] Tower Surveying Tools? (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Mon Jun 9 11:29:34 2003
It is easier to just use tape measures simulateously to triangulate. This avoids drawing arcs on the ground. For example, mark the first guy point at the correct radius and arbitrary angle, then pul
/archives//html/Towertalk/2003-06/msg00150.html (9,097 bytes)

9. [TowerTalk] Tower Surveying Tools? (score: 1)
Author: richard@karlquist.com (Rick Karlquist)
Date: Mon Jun 9 17:22:39 2003
Right, the ratio should be 1.732 (square root of 3) Rick N6RK
/archives//html/Towertalk/2003-06/msg00156.html (8,915 bytes)

10. [TowerTalk] US Towers and wind Loading Capacity (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri Jun 20 00:37:56 2003
Where did those numbers come from? AFAIK, the MA-550 barely survives 80 MPH with no antenna on top. I see no way you can do what you propose unless you crank the tower down whenever you are off the a
/archives//html/Towertalk/2003-06/msg00298.html (9,260 bytes)

11. [TowerTalk] Earth Screw Anchors (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Thu Jun 26 10:14:26 2003
Sometimes you can get earth anchors locally from businesses that sell landscaping and tree trimming supplies to tree service businesses. You can also get them by mail from McMaster-Carr. I got some
/archives//html/Towertalk/2003-06/msg00483.html (7,283 bytes)

12. [TowerTalk] Earth Anchors (score: 1)
Author: richard@karlquist.com (Rick Karlquist)
Date: Thu Jun 26 20:41:07 2003
I put 500 lbs of load on one of them last Saturday and it didn't budge. I have clay soil FWIW. Rick N6RK
/archives//html/Towertalk/2003-06/msg00508.html (6,889 bytes)

13. [TowerTalk] Low band receiving antennas (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri Apr 4 22:56:58 2003
I recently compared a 520 ft Beverage on 75m to a 4 element vertical receive array. The vertical array was a rectangular end fire/ broadside arrangement of dimensions 1/4 wl by 1/2 wl (65 feet by 13
/archives//html/Towertalk/2003-04/msg00069.html (7,857 bytes)

14. [TowerTalk] Identifying ferrite core material (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri Mar 14 11:23:03 2003
99% of the time, these things are Fair-Rite 43 or equivalent. The permeability is 1000 up to about a MHz, then they become mostly resistive. Rick Karlquist N6RK richard@karlquist.com www.n6rk.com ww
/archives//html/Towertalk/2003-03/msg00177.html (7,515 bytes)

15. [TowerTalk] "Growing" a universal tower...` (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Sat Mar 15 23:38:05 2003
Use a 26 inch section with larger tubing and/or thicker wall. The tower vendors can usually make up sections like this. Rick Karlquist N6RK richard@karlquist.com www.n6rk.com www.karlquist.com
/archives//html/Towertalk/2003-03/msg00202.html (7,323 bytes)

16. [TowerTalk] mechanical construction of 80m vertical (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri Mar 21 01:23:08 2003
Thanks for the plug Tim :-) Some additional info not yet on my web site: I have made numerous scaled down versions of the 90 foot vertical. 60 feet of 3 inch (.050 wall) tubing works well when tilte
/archives//html/Towertalk/2003-03/msg00271.html (9,746 bytes)

17. [TowerTalk] mechanical construction of 80m vertical (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Sat Mar 22 21:07:28 2003
Standard irrigation tubing is 0.050 inch wall. "Heavy duty" tubing is 0.065 inch wall. There is some "center pivot" stuff up to 0.100 or so. For GUYED installations, I see no reason to use anything
/archives//html/Towertalk/2003-03/msg00295.html (10,457 bytes)

18. [TowerTalk] Paul Bunyan Whip (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Tue Feb 25 00:53:25 2003
1. Making a mast self supporting with only its own windloading is nontrivial, so the fact that you are only supporting a wire doesn't help you all that much. 2. An aluminum self supporting pipe mast
/archives//html/Towertalk/2003-02/msg00464.html (8,032 bytes)

19. [Towertalk] Frying doesn't hurt ferrite. (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Fri, 10 Jan 2003 18:55:49 -0800
Yes they do. If you put an ampere turn or so through a high permeability ferrite, it will magnetize and permanently lose a lot of inductance. You can of course fix this by heating above the curie te
/archives//html/Towertalk/2003-01/msg00199.html (8,191 bytes)

20. [Towertalk] SDS Power Hammers (score: 1)
Author: richard@karlquist.com (Richard Karlquist)
Date: Thu Jan 23 00:54:22 2003
To search, use the search window on the index page of contesting.com (do not click on towertalk first). Has anyone found an SDS ground rod driver? I can only find spline and SDS max types. Harbor Fre
/archives//html/Towertalk/2003-01/msg00370.html (6,868 bytes)


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