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Total 22 documents matching your query.

1. Topband: Under the Unbrella signals (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 15 Oct 2003 11:29:57 -0700
Hello All, When the sunspot cycle was lower (a few years ago) I could hear Europe shortpath with a very very long(4 wavelengths) Beverage that ran down a steep hill toward Europe loosing 150 feet of
/archives//html/Topband/2003-10/msg00094.html (7,409 bytes)

2. Topband: Beverage w/ground simulation (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Sun, 28 Dec 2003 11:34:12 -0700
Hello, Is there any way to run a beverage over a canyon and maintain a ground simulation. i.e... Keep the beverage thinking that it is near lossy earth while it may be 30' above the ground before it
/archives//html/Topband/2003-12/msg00241.html (6,806 bytes)

3. Topband: Beverage w/ground simulation (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Mon, 29 Dec 2003 11:12:13 -0700
My main interest is to find out if the antenna wire which is 30' from the bottom of the canyon will change the antenna from an endfire Beverage into a 30' high long wire at that part of the antenna.
/archives//html/Topband/2003-12/msg00268.html (7,523 bytes)

4. Topband: Beverage over a canyon, ground (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Tue, 30 Dec 2003 19:48:25 -0700
I received four responses telling me how to put grounded wires over the canyon to simulate a ground condition and minimize the "long wire" effect (high angle reception). One suggested a single wire a
/archives//html/Topband/2003-12/msg00316.html (6,734 bytes)

5. Topband: Loaded BOG Rx Antenna - 160 meters (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 10 Mar 2004 10:58:56 -0700
Hello, I have done some modeling of a loaded Beverage and it looked to me like the best place for loading was about 10% from each end. The pattern noticeably resembled a longer Beverage. If the Bever
/archives//html/Topband/2004-03/msg00129.html (7,363 bytes)

6. Topband: Topband at solar maximum (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 10 Mar 2004 11:12:19 -0700
Hello, Speaking of short path contacts to Europe through the auroral oval from Arizona the difference is a few QSO's a year at Solar Max to 10 or 20 QSO's a night during the solar Min. The difference
/archives//html/Topband/2004-03/msg00130.html (7,227 bytes)

7. Topband: Long Path Direction! (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Tue, 30 Mar 2004 10:36:35 -0700
On occasions I hear hams talking about the direction of the long path. It seems that many hams think that the "long path" is the inverse of the "short path. In reality it is the direction of the gray
/archives//html/Topband/2004-03/msg00336.html (6,452 bytes)

8. Topband: Long Path dierction! (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 31 Mar 2004 11:25:27 -0700
Hello again, Thank you to all who have responded. I have had the opportunity read the replies and think about the replies. We have some very smart people on this reflector. The difference in each of
/archives//html/Topband/2004-03/msg00351.html (10,286 bytes)

9. Re: Topband: Beverage array interaction (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Sat, 22 May 2004 17:24:48 -0700
Hello, A good test to see the interaction in play is to use EZNEC. Model a Beverage antenna and a 1/4 wave parasitic self resonate vertical near it. Move the vertical all around the Beverage in the m
/archives//html/Topband/2004-05/msg00071.html (8,668 bytes)

10. Topband: 2 wire beverage (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 25 Aug 2004 19:22:49 -0700
Hello All, I center feed most of my 2 wire Beverage antennas and this works fine too. My biggest problem is damage caused by the antlers of Deer and chewing damage caused by Coyotes and Javalina's(wi
/archives//html/Topband/2004-08/msg00088.html (7,595 bytes)

11. Topband: old pattern repeated this cycle (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Fri, 1 Oct 2004 10:57:18 -0700
Re: Observation seen by DF2PY, Re: Observation seen by Wolf, DF2PY, I also saw the Big night on 80 meters. I worked many Europeans that night. As I wrote Wolf, we in the west see this happening every
/archives//html/Topband/2004-10/msg00003.html (8,333 bytes)

12. Topband: Beverage ends: taper down or not? (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Mon, 4 Oct 2004 11:15:14 -0700
Hi Mike, To minimize damage from large animals I use #10 solid conductor hard drawn copper wire with insulation (house wire). The animals do chew and mess with it but I have no failures. I also try t
/archives//html/Topband/2004-10/msg00026.html (6,852 bytes)

13. Re: Topband: B.O.G. vs. regular beverage (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Mon, 11 Oct 2004 18:58:54 -0700
Hi Chuck, I have tried a Beverage on the ground and found that the gain was to low for use without a pre-amp. I elevated it 1 inch and the gain was almost as good as 10 feet and no pre-amp was needed
/archives//html/Topband/2004-10/msg00055.html (8,657 bytes)

14. Topband: close to earth Beverage (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Sun, 21 Nov 2004 20:33:08 -0700
I have several very low Beverage antennas and what I find is that the enhanced performance seems to be caused by the low Beverage's inability to hear local man made noise very well. When I use the no
/archives//html/Topband/2004-11/msg00215.html (7,316 bytes)

15. Topband: sloper antennas (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Mon, 6 Dec 2004 10:26:22 -0700
Hello, When I think of a Sloper Antenna I think of it as a technique of loading the tower. The tower has about 1/2 of the current and does half of the radiating. If the tower is grounded the current
/archives//html/Topband/2004-12/msg00107.html (7,812 bytes)

16. Topband: Cone of Silence (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 11 May 2005 09:56:29 -0700
Hello, I experimented with the cone of silence many years ago with a very low Beverage (1 inch high). To my amazement I could easily see when I had reached the correct length. The ZL and VK signals w
/archives//html/Topband/2005-05/msg00014.html (6,841 bytes)

17. Topband: cone of silence (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Thu, 12 May 2005 11:02:05 -0700
Hello, On my 300 foot Beverage that is 1 inch high the length was about 300' even. I presume that the low height caused some velocity factor reaction. The null was very obvious when compared to the n
/archives//html/Topband/2005-05/msg00023.html (6,884 bytes)

18. Topband: Fw: 80m DX window (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Wed, 23 Nov 2005 16:58:50 -0700
3500-3500 is a problem here in the western USA because of Mexican fishing boats on SSB. We can't win! Don, w7dd _______________________________________________ Topband mailing list Topband@contestin
/archives//html/Topband/2005-11/msg00294.html (6,503 bytes)

19. Topband: Tower coupling into antenna (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Sat, 21 Jan 2006 12:02:20 -0700
Re; AA2MF You can model the tower including all antennas on the tower and with the inverted L in the model using EZNEC. Change all of the sources to zero amplitude except the inverted L. You then can
/archives//html/Topband/2006-01/msg00301.html (6,847 bytes)

20. Topband: Terrain - 160M Array (score: 1)
Author: "D Andersen" <w7dddd@msn.com>
Date: Thu, 23 Mar 2006 10:53:07 -0700
A single vertical can be modeled with EZNEC and if you lean the vertical slightly at the terrain angle you can see the result. To see the result just tilt your head a little and pretend the vertical
/archives//html/Topband/2006-03/msg00171.html (7,305 bytes)

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