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1. Topband: Radial/screen radius (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Thu, 5 Sep 2002 11:40:49 -0700; If you would like a quantitative idea of the effect of increasing the radius of a conductive ground screen take a look at figure 6, page 40, QST July 2000. This is a graph of the percent of loss with; /archives//html/Topband/2002-09/msg00046.html (6,905 bytes)
2. Topband: Radial discussion (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sat, 7 Sep 2002 09:30:24 -0700; I would like to echo Scott's appreciation for the radial wire discussion on the reflector. I am in the process of laying out a very large ground system for an array essentially the same as described; /archives//html/Topband/2002-09/msg00062.html (8,191 bytes)
3. Topband: Radials (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sun, 8 Sep 2002 15:54:11 -0700; Ah, some more interesting comments. My needs are quite immediate as I am working on the system daily. I will have about 100 radials per vertical, plus 200 or more connections out in the radial field; /archives//html/Topband/2002-09/msg00078.html (8,671 bytes)
4. Topband: Silver solder (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Wed, 11 Sep 2002 11:34:06 -0700; Thanks Don for the info. It confirms my thoughts. I have been running a series of experiments with the suggestions made earlier on the reflector and had decided to go with, copper radials, silver sol; /archives//html/Topband/2002-09/msg00113.html (6,426 bytes)
5. Topband: burial depth (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sun, 22 Sep 2002 14:48:01 -0700; The effect of burial depth depends on your soil. For example, in average soil (.005 S/m, 13) the skin depth at 1.8 MHz is about 6 m (20'). Even at 3' you will still keep current out of much of the so; /archives//html/Topband/2002-09/msg00158.html (6,356 bytes)
6. Topband: radials (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sat, 31 Aug 2002 16:24:48 -0700; Tom is correct and the basic ideas have been around for nearly 70 years. If you want to see where this all comes from, check out the article in QST for July 2000, pages 38-44. You can take the equati; /archives//html/Topband/2002-08/msg00125.html (6,464 bytes)
7. Topband: tower resonance (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sun, 19 May 2002 09:06:13 -0700; I would like some advice on how to measure the resonant frequencies of a grounded tower with HF arrays, guys, etc, etc, on it. This is related to the antenna interaction questions discussed earlier.; /archives//html/Topband/2002-05/msg00135.html (6,641 bytes)
8. Topband: tower resonance (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sun, 19 May 2002 15:14:46 -0700; Thanks Phil, I was aware of John's method (figure 9-84 in Low Band DXing) but was wondering if there were any other clever ways to do it. Maybe without hanging a wire from the top of the tower or oth; /archives//html/Topband/2002-05/msg00136.html (6,771 bytes)
9. Topband: tower resonance (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Tue, 21 May 2002 15:20:33 -0700; Thanks all for the comments on tower resonance measurements. The question was actually prompted by some recent measurements I made using the ON4UN/W1FB method of a drop wire from the top of the tower; /archives//html/Topband/2002-05/msg00149.html (7,850 bytes)
10. Topband: Tower Resonance (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Mon, 27 May 2002 10:04:57 -0700; Hello all, Thanks for the comments. Gives me something to think about. Ulrich - I didn't mean to imply that the ON4UN/W1FB approach didn't work. It works fine but if you remove the drop wire then thi; /archives//html/Topband/2002-05/msg00176.html (7,748 bytes)
11. Topband: antenna interaction (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Tue, 30 Apr 2002 17:16:25 -0700; The discussion on the interaction between 160 m verticals and other antennas and structures is very appropriate. I learned that lesson again just recently. Last summer I erected a two element vertica; /archives//html/Topband/2002-04/msg00087.html (8,180 bytes)
12. Topband: Short antennas (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Tue, 12 Feb 2002 09:20:29 -0800; Hi Tony, If you want to do a bit of reading there are plenty of articles which explain your results very clearly. For a comparison of capacitive hat versus inductive loading take a look a the ARRL an; /archives//html/Topband/2002-02/msg00050.html (7,530 bytes)
13. Topband: Low Band DXing (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Tue, 12 Feb 2002 15:20:23 -0800; Hello again, I left out an important reference: John Devoldere's "Low Band DXing"! Lots of information on low band verticals and a ton of references. sorry John! 73, Rudy N6LF; /archives//html/Topband/2002-02/msg00055.html (6,392 bytes)
14. Topband: Shunt fed verticals (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Fri, 22 Feb 2002 09:21:48 -0800; Hello, There is a classic paper on shunt fed verticals which is very informative: Morrison and Smith, The Shunt-Excited Antenna, IRE proceedings, June 1937, pp. 673-696 They and other references poin; /archives//html/Topband/2002-02/msg00136.html (7,362 bytes)
15. Topband: BC filter (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Sun, 21 Oct 2001 09:52:07 -0700; Not only is it a good idea to use a BC filter to protect the your preamp but also use it when making antenna measurements. I recently put up a two element array on 160. While checking the SWR matchin; /archives//html/Topband/2001-10/msg00185.html (6,993 bytes)
16. Topband: BC filter (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Mon, 22 Oct 2001 09:17:05 -0700; The filter I used is made by Industrial Communications Engineers (ICE), model 402. As for the effect of the filter on the SWR measurement. I checked that by measuring the SWR of a dummy load with and; /archives//html/Topband/2001-10/msg00189.html (7,573 bytes)
17. Topband: BC filter (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Wed, 24 Oct 2001 09:21:21 -0700; For those who asked about ICE I gave them a call this morning. Their web page is not active so you will have to contact them directly: ICE PO Box 18495 Indianapolis, IN 46218-0495 1-800-423-2666 1-31; /archives//html/Topband/2001-10/msg00204.html (8,943 bytes)
18. Topband: ICE 403 filter (score: 1): Author: rudys@ordata.com (Rudy Severns); Date: Thu, 25 Oct 2001 09:52:29 -0700; Hello, I haven't even looked at the 403 so it is hard for me to comment intelligently. I should get one and run a transfer function for myself. The filters may or may not cascade usefully, would have; /archives//html/Topband/2001-10/msg00207.html (6,893 bytes)
19. Topband: 9 Feb west coast 160 condx (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Mon, 9 Feb 2004 17:15:58 -0800; For those of us on the west coast last night was a real but rare treat. From Oregon I was able to work DL6RAI, DL5RBW, DF2PY, F5IN and I2ZFD without much difficulty. Wolf of course was quite strong,; /archives//html/Topband/2004-02/msg00139.html (6,945 bytes)
20. Topband: SP5EWY vertical (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Wed, 11 Feb 2004 10:16:57 -0800; Richard, I have three top loaded verticals about your height in my array. I adjusted the top loading (only two wires sloping) so the vertical was resonant a bit high in frequency. I then put a small; /archives//html/Topband/2004-02/msg00169.html (6,519 bytes)

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