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1. [TowerTalk] Shunt-fed tower (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Thu, 26 Jun 2008 15:43:23 -0500
Hello all, We are preparing a 22m tower, with Explorer 14 on top, for shunt-feed. We are working on the ground system. Our shack and tower are within limits of a 8m x 8m area, a 1m high concrete bloc
/archives//html/Towertalk/2008-06/msg00615.html (8,469 bytes)

2. [TowerTalk] TX RELAYS (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Fri, 18 Jul 2008 07:55:37 -0500
Hello All, I need advice on relays. What are the minimum parameters should I look for? http://www.findernet.com/en/products/profiles.php?serie=46&lang=en Would the relay in this link work to withstan
/archives//html/Towertalk/2008-07/msg00459.html (7,897 bytes)

3. Re: [TowerTalk] TX RELAYS (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Fri, 18 Jul 2008 15:59:45 -0500
Jim and Roger, thank you very much for reply, I knew it was not so simple. 73 David HK1KXA EC5KXA _________________________________________________________________ Explore the seven wonders of the wo
/archives//html/Towertalk/2008-07/msg00496.html (10,412 bytes)

4. [TowerTalk] Coaxial Moxon (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Sun, 3 Aug 2008 18:09:10 -0500
http://www.hamuniverse.com/17mcoaxmox.html A quarter wave coax, shorted at the end shows an infinite impedance. Is it possible what is described in the link? David HK1KXA EC5KXA _____________________
/archives//html/Towertalk/2008-08/msg00063.html (6,949 bytes)

5. Re: [TowerTalk] Coaxial Moxon (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Tue, 5 Aug 2008 01:39:26 -0500
Thank you Dan, Interesting article and it says it all. David HK1KXA EC5KXA A quarter wave coax, shorted at the end shows an infinite impedance.Is it possible what is described in the link? A coax jus
/archives//html/Towertalk/2008-08/msg00121.html (9,379 bytes)

6. Re: [TowerTalk] Coaxial Moxon (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Tue, 5 Aug 2008 01:31:14 -0500
Thank you all for the response. I made one dipole for 10m band with RG8 type, vf=.66, formula dictated about 1.75m for each half of the dipole. I started with 1.80m per side, and hung it about 2 mete
/archives//html/Towertalk/2008-08/msg00122.html (12,171 bytes)

7. Re: [TowerTalk] Vertical dipoles (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Tue, 17 Nov 2009 18:08:28 -0500
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=7466 David HK1KXA EC5KXA _________________________________________________________________ Windows Live: Make it easier for your friends to see what you
/archives//html/Towertalk/2009-11/msg00304.html (8,600 bytes)

8. [TowerTalk] FW: Vertical dipoles (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Wed, 18 Nov 2009 08:52:53 -0500
I wonder what quality of ground and heights were used to compare the HVD (Halfwave Vertical Dipole) against that inverted vee. I have used HVD for 7 MHz shortened with capacitive hats at both ends; b
/archives//html/Towertalk/2009-11/msg00318.html (11,583 bytes)

9. [TowerTalk] FW: Vertical Dipoles (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Wed, 18 Nov 2009 12:54:32 -0500
http://www.ece.utah.edu/~ece3300/Labs/lab3/ Here you can find the file list. "The pertinent statement is that a monopole has twice the power density of a dipole. "....this gives a directivity or gain
/archives//html/Towertalk/2009-11/msg00326.html (10,817 bytes)

10. Re: [TowerTalk] FW: Vertical Dipoles (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Wed, 18 Nov 2009 16:35:41 -0500
Hallo, Peter, You are supposed to have the same Rrad if the amps-degrees area are the same. It should be around 36 ohms like a lossless 90º monopole. If you check on N6LF-Rudy's article, Table 1 show
/archives//html/Towertalk/2009-11/msg00337.html (10,139 bytes)

11. Re: [TowerTalk] Vertical dipoles (K4SAV) (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Sat, 21 Nov 2009 08:56:24 -0500
Hello, That antenna can be improved a bit: I would lenghten the upper loading and the vertical section to shorten the bottom radials and make 'em become bottom capacitive loading. Maybe the feed poin
/archives//html/Towertalk/2009-11/msg00388.html (9,451 bytes)

12. [TowerTalk] Open wire lines (score: 1)
Author: "David J. Sourdis" <hk1kxa@hotmail.com>
Date: Mon, 30 Nov 2009 09:01:38 -0500
I am looking for information on open wire lines. I want more than is available on the Antenna Book or the one paragraph information on LBDXing saying practically "better not". Maybe some hints a kink
/archives//html/Towertalk/2009-11/msg00514.html (7,494 bytes)

13. [TowerTalk] Dielectrically lenghtening the boom (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Fri, 18 Dec 2009 10:56:47 -0500
Maybe it has already been applied to the cellphone technology or elsewhere, or it is just not feasible because dielectric losses... Dielectric material, lossy in some extent, sets a velocity factor (
/archives//html/Towertalk/2009-12/msg00175.html (9,013 bytes)

14. Re: [TowerTalk] Dielectrically lenghtening the boom (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Fri, 18 Dec 2009 15:18:10 -0500
Thank you, Jim and Dan, for the information. 73 David HK1A EC5KXA ex-HK1KXA _________________________________________________________________ Windows Live: Keep your friends up to date with what you
/archives//html/Towertalk/2009-12/msg00180.html (9,112 bytes)

15. Re: [TowerTalk] Dielectrically lenghtening the boom (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Sat, 19 Dec 2009 07:15:39 -0500
My bad, I was maybe thinking about VF < 1.0. I meant dielectric constant > 1.0 instead of <1.0. Back to the shortened boom Yagi discussion, Dan said something that I will put in my words: That the wa
/archives//html/Towertalk/2009-12/msg00201.html (11,256 bytes)

16. [TowerTalk] HFTA question (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Wed, 20 Jan 2010 19:15:17 -0500
There's a hill that is about 27 meters (90 ft) above the flat surrounding terrain. Caribbean sea shore is less than two kilometers from this hill. I guess there is a minimum distance of wavelenghts o
/archives//html/Towertalk/2010-01/msg00441.html (8,075 bytes)

17. Re: [TowerTalk] KH7XS station for sale (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Wed, 27 Jan 2010 06:39:59 -0500
Pardon me for the geology bandwidth, but... What is the criteria or the parameters to determine that a volcano is extinct? Is there a record of "extinct volcanos" coming back to life? David HK1A EC5K
/archives//html/Towertalk/2010-01/msg00805.html (16,754 bytes)

18. Re: [TowerTalk] KH7XS station for sale (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Wed, 27 Jan 2010 07:42:17 -0500
http://en.wikipedia.org/wiki/Inactive_volcano#Scientific_classification_of_volcanoes It seems that the term extinct referred to volcanos is part of the popular classification of volcanos. Scientific
/archives//html/Towertalk/2010-01/msg00810.html (10,290 bytes)

19. [TowerTalk] 15 m OWA (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Thu, 4 Feb 2010 09:58:13 -0500
http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=7523 I have seen the OWA antenna designs graciously shared with all on this page. 48 footer booms are sooo long. Is there any OWA design available for 2
/archives//html/Towertalk/2010-02/msg00105.html (7,866 bytes)

20. Re: [TowerTalk] 15 m OWA (score: 1)
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Thu, 4 Feb 2010 18:03:07 -0500
Thank you, Scott. The plan is DIY, no buying. Antenna prizes have gone crazy. It seems that alchemists finally found the way to get gold... out of aluminium! ;-) This was sent to me by someone (ty) i
/archives//html/Towertalk/2010-02/msg00128.html (10,987 bytes)

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